---

Exhibit 4.72


STANDARD LARGE GENERATOR

INTERCONNECTION AGREEMENT (LGIA)

Between

SIERRA PACIFIC POWER COMPANY

AND

NGP BLUE MOUNTAIN I LLC

Date  11/5/2007

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|TABLE OF CONTENTS                                                                      
|---------------------------------------------------------------------------------------
|Recitals                                                                               
|                                                                                       
|Article 1. Definitions                                                                 
|                                                                                       
|Article 2. Effective Date, Term and
      Termination                                  
|2.1                                                                                    
|2.2                                                                                    
|2.3                                                                                    
|                                                                                       
|                                                                                       
|2.4                                                                                    
|2.5                                                                                    
|2.6                                                                                    
|Article 3. Regulatory Filings                                                          
|3.1                                                                                    
|                                                                                       
|Article 4. Scope of Service                                                            
|4.1                                                                                    
|                                                                                       
|                                                                                       
|                                                                                       
|                                                                                       
|                                                                                       
|                                                                                       
|4.2                                                                                    
|4.3                                                                                    
|4.4                                                                                    
|4.5                                                                                    
|                                                                                       
|Article 5. Interconnection Facilities
      Engineering, Procurement & **Construction**
|                                                                                       
|5.1                                                                                    
|                                                                                       
|                                                                                       
|                                                                                       
|                                                                                       
|5.2                                                                                    
|5.3                                                                                    
|5.4                                                                                    
|5.5                                                                                    
|5.6                                                                                    
|5.7                                                                                    
|5.8                                                                                    
|5.9                                                                                    
|                                                                                       
|                                                                                       
|                                                                                       
|5.10                                                                                   
|5.11                                                                                   
|5.12                                                                                   
|5.13                                                                                   
|5.14                                                                                   
|5.15                                                                                   

|Issued by: Mario Villar | i | Effective: 11/5/2007
|----------------------- | - | --------------------
|Executive, Transmission |   |                     
|Issued on:              |   |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|                                  | 5.16 Taxes                                               |                                                                                                         | 22
|--------------------------------- | -------------------------------------------------------- | ------------------------------------------------------------------------------------------------------- | --
|                                  | 5.16.1                                                   | Interconnection Customer Payments Not
      Taxable                                                     | 22
|                                  | 5.16.2                                                   | Representations and Covenants                                                                           | 23
|                                  | 5.16.3                                                   | Indemnification for Cost Consequences
      of Current Tax Liability Imposed Upon Transmission Provider |   
|23                               
|                                  | 5.16.4                                                   | Tax Gross-Up Amount                                                                                     | 23
|                                  | 5.16.5                                                   | Private Letter Ruling or Change or
      Clarification of Law                                           |   
|24                               
|                                  | 5.16.6                                                   | Subsequent Taxable Events                                                                               | 25
|                                  | 5.16.7                                                   | Contests                                                                                                | 25
|                                  | 5.16.8                                                   | Refund                                                                                                  | 25
|                                  | 5.16.9                                                   | Taxes Other Than Income Taxes                                                                           | 27
|                                  | 5.16.10                                                  | Transmission Owners Who Are Not Transmission                                                            |   
|                                  |                                                          | Providers                                                                                               | 27
|                                  | 5.17                                                     | Tax Status                                                                                              | 27
|                                  | 5.18                                                     | Modification                                                                                            | 27
|                                  | 5.18.1                                                   | General                                                                                                 | 27
|                                  | 5.18.2                                                   | Standards                                                                                               | 28
|                                  | 5.18.3                                                   | Modification Costs                                                                                      | 28
|                                  |                                                          |                                                                                                         |   
|Article 6. Testing and Inspection | 28                                                      
|6.1                               | Pre-Commercial Operation Date Testing and Modifications  | 28                                                                                                     
|6.2                               | Post-Commercial Operation Date Testing and Modifications | 28                                                                                                     
|6.3                               | Right to
      Observe Testing                           | 29                                                                                                     
|6.4                               | Right to
      Inspect                                   | 29                                                                                                     
|                                  |                                                          |                                                                                                         |   
|**Article 7.** Metering           |                                                          | 29                                                                                                     
|7.1                               | General                                                  |                                                                                                         | 29
|7.2                               | Check
      Meters                                       | 29                                                                                                     
|7.3                               | Standards                                                | 29                                                                                                     
|7.4                               | Testing of
      Metering Equipment                      | 30                                                                                                     
|7.5                               | Metering
      Data                                      | 30                                                                                                     
|                                  |                                                          |                                                                                                         |   
|Article 8. Communications         | 30                                                      
|8.1                               | Interconnection Customer Obligations                     | 30                                                                                                     
|8.2                               | Remote
      Terminal Unit                               | 31                                                                                                     
|8.3                               | No Annexation                                            | 31                                                                                                     
|                                  |                                                          |                                                                                                         |   
|Article 9. Operations             | 31                                                      
|9.1                               | General                                                  |                                                                                                         | 31
|9.2                               | Control
      Area Notification                          | 31                                                                                                     
|9.3                               | Transmission Provider
      Obligations                  | 31                                                                                                     
|**** 9.4                          | Interconnection Customer Obligations                     | 31                                                                                                     
|9.5                               | Start-Up
      and Synchronization                       | 31                                                                                                     
|9.6                               | Reactive
      Power                                     | 31                                                                                                     
|                                  | 9.6.1                                                    | Power Factor Design Criteria                                                                            | 31
|                                  | 9.6.2                                                    | Voltage Schedules                                                                                       | 31
|                                  |                                                          | 9.6.2.1   Governors and Regulators                                                                      | 32
|9.7                               | Outages
      and Interruptions                          | 33                                                                                                     
|                                  | 9.7.1
      Outages                                      | 33                                                                                                     
|                                  |                                                          | 9.7.1.1 Outage Authority and Coordination                                                               | 33
|                                  |                                                          | 9.7.1.2 Outage Schedules                                                                                | 33
|                                  |                                                          | 9.7.1.3 Outage Restoration                                                                              | 34
|                                  | 9.7.2                                                    | Interruption of Service                                                                                 | 34
|                                  | 9.7.3                                                    | Under-Frequency and Over-Frequency Conditions                                                           | 34

|Issued by: Mario Villar | ii | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |    |                     
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|                                                            | 9.7.4                                                     | System Protection and Other Control
      Requirements | 35
|----------------------------------------------------------- | --------------------------------------------------------- | ------------------------------------------------------ | --
|                                                            | 9.7.5                                                     | Requirements for Protection                            | 36
|                                                            | 9.7.6                                                     | Power Quality                                          | 36
|9.8                                                         | Switching and Tagging Rules                               | 37                                                    
|9.9                                                         | Use of Interconnection
      Facilities by Third Parties  | 37                                                    
|                                                            | 9.9.1                                                     | Purpose of Interconnection Facilities                  | 37
|                                                            | 9.9.2                                                     | Third Party Users                                      | 37
|9.10                                                        | Disturbance Analysis Data Exchange                        | 37                                                    
|                                                            |                                                           |                                                        |   
|Article 10. Maintenance                                     | 38                                                       
|10.1                                                        | Transmission Provider Obligations                         | 38                                                    
|10.2                                                        | Interconnection Customer Obligations                      | 38                                                    
|10.3                                                        | Coordination                                              | 38                                                    
|10.4                                                        | Secondary Systems                                         | 38                                                    
|10.5                                                        | Operating and Maintenance Expenses                        | 38                                                    
|                                                            |                                                           |                                                        |   
|Article 11. Performance Obligation                          | 38                                                       
|11.1                                                        | Interconnection Customer
      Interconnection Facilities | 38                                                    
|11.2                                                        | Transmission Provider's
      Interconnection Facilities  | 38                                                    
|11.3                                                        | Network Upgrades and Distribution
      Upgrades          | 39                                                    
|11.4                                                        | Transmission Credits                                      | 39                                                    
|                                                            | 11.4.1                                                    | Refunds of Amounts Advanced for Network
      Upgrades | 39
|                                                            | 11.4.2                                                    | Special Provisions for Affected Systems                | 40
|11.5                                                        | Provision of Security                                     | 40                                                    
|                                                            |                                                           |                                                        |   
|Article 12. Invoice                                         | 41                                                       
|12.1                                                        | General                                                   |                                                        | 41
|12.2                                                        | Final Invoice                                             | 41                                                    
|12.3                                                        | Payment                                                   |                                                        | 41
|12.4                                                        | Disputes                                                  |                                                        | 41
|                                                            |                                                           |                                                        |   
|Article 13. Emergencies                                     | 41                                                       
|13.1                                                        | Definition                                                |                                                        | 41
|13.2                                                        | Obligations                                               | 42                                                    
|13.3                                                        | Notice                                                    |                                                        | 42
|13.4                                                        | Immediate Action                                          | 42                                                    
|13.5                                                        | Transmission Provider Authority                           | 42                                                    
|                                                            | 13.5.1                                                    | General                                                | 42
|                                                            | 13.5.2                                                    | Reduction and Disconnection                            | 43
|13.6                                                        | Interconnection Customer Authority                        | 43                                                    
|13.7                                                        | Limited Liability                                         | 44                                                    
|                                                            |                                                           |                                                        |   
|Article 14. Regulatory Requirements and
      Governing Law | 44                                                       
|14.1                                                        | Regulatory Requirements                                   | 44                                                    
|14.2                                                        | Governing Laws                                            | 44                                                    
|                                                            |                                                           |                                                        |   
|Article 15. Notices                                         | 44                                                       
|15.1                                                        | General                                                   |                                                        | 44
|15.2                                                        | Billings and Payments                                     | 44                                                    
|15.3                                                        | Alternative Forms of Notice                               | 45                                                    
|15.4                                                        | Operations and Maintenance Notice                         | 45                                                    

|Issued by: Mario Villar | iii | Effective: 11/5/2007
|----------------------- | --- | --------------------
|Executive, Transmission |     |                     
|Issued on:              |     |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|Article 16. Force Majeure                                      | 45                                                              
|-------------------------------------------------------------- | ----------------------------------------------------------------
|                                                               |                                                                 
|                                                               |                                                                 
|Article 17. Default                                            | 45                                                              
|17.1                                                           | Default                                                         
|                                                               | 17.1.1                                                          
|                                                               | 17.1.2                                                          
|                                                               |                                                                 
|Article 18. Indemnity, Consequential Damages
    and Insurance | 46                                                              
|18.1                                                           | Indemnity                                                       
|                                                               | 18.1.1                                                          
|                                                               | 18.1.2                                                          
|                                                               | 18.1.3                                                          
|18.2                                                           | Consequential Damages                                           
|18.3                                                           | Insurance                                                       
|                                                               |                                                                 
|                                                               |                                                                 
|Article 19. Assignment                                         | 49                                                              
|                                                               |                                                                 
|Article 20. Severability                                       | 50                                                              
|                                                               |                                                                 
|Article 21. Comparability                                      | 50                                                              
|                                                               |                                                                 
|Article 22. Confidentiality                                    | 50                                                              
|22.1                                                           | Confidentiality                                                 
|                                                               | 22.1.1                                                          
|                                                               | 22.1.2                                                          
|                                                               | 22.1.3                                                          
|                                                               | 22.1.4                                                          
|                                                               | 22.1.5                                                          
|                                                               | 22.1.6                                                          
|                                                               | 22.1.7                                                          
|                                                               | 22.1.8                                                          
|                                                               | 22.1.9                                                          
|                                                               | 22.1.10                                                         
|                                                               |                                                                 
|                                                               |                                                                 
|Article 23. Environmental Releases                             | 54                                                              
|                                                               |                                                                 
|Article 24. Information Requirements                           | 54                                                              
|24.1                                                           | Information Acquisition                                         
|24.2                                                           | Information Submission by
      Transmission Provider           
|24.3                                                           | Updated Information Submission by
      Interconnection Customer
|24.4                                                           | Information Supplementation                                     
|                                                               |                                                                 
|Article 25. Information Access and Audit
    Rights            | 55                                                              
|25.1                                                           | Information Access                                              
|25.2                                                           | Reporting of Non-Force Majeure Events                           
|25.3                                                           | Audit Rights                                                    
|25.4                                                           | Audit Rights Periods                                            
|                                                               | 25.4.1                                                          
|                                                               | 25.4.2                                                          
|25.5                                                           | Audit Results                                                   

|Issued by: Mario Villar | iv | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |    |                     
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|Article 26. Subcontractors                                 | 57                          
|---------------------------------------------------------- | ----------------------------
|26.1                                                       | General                     
|26.2                                                       | Responsibility of Principal 
|26.3                                                       | No Limitation by Insurance  
|                                                           |                             
|                                                           |                             
|Article 27. Disputes                                       | 57                          
|                                                           |                             
|Article 28. Representations, Warranties, and
    Covenants | 58                          
|28.1                                                       | General                     
|                                                           | 28.1.1 Good Standing        
|                                                           | 28.1.2 Authority            
|                                                           | 28.1.3 No Conflict          
|                                                           | 28.1.4 Consent and Approval 
|                                                           |                             
|                                                           |                             
|Article 29. Joint Operating Committee                      | 59                          
|                                                           |                             
|Article 30. Miscellaneous                                  | 59                          
|30.1                                                       | Binding Effect              
|30.2                                                       | Conflicts                   
|30.3                                                       | Rules of Interpretation     
|30.4                                                       | Entire Agreement            
|30.5                                                       | No Third Party Beneficiaries
|30.6                                                       | Waiver                      
|30.7                                                       | Headings                    
|30.8                                                       | Multiple Counterparts       
|30.9                                                       | Amendment                   
|30.10                                                      | Modification by the Parties 
|30.11                                                      | No Partnership              

|Issued by: Mario Villar | V | Effective: 11/5/2007
|----------------------- | - | --------------------
|Executive, Transmission |   |                     
|Issued on:              |   |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Appendix A - Interconnection Facilities, Network Upgrades,
Distribution Upgrades, and Affected System Upgrades

Appendix B - Milestones

Appendix C - Interconnection Details

Appendix D - Security
  Arrangement Details

Appendix E - Commercial Operation Date

Appendix F - Addresses for Delivery of Notices and Billings

Appendix G - Interconnection Requirements for a Wind Generating
Plant

Appendix H - Reliability Management System Agreement (RMS)

|Issued by: Mario Villar | Vi | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |    |                     
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

STANDARD LARGE GENERATOR INTERCONNECTION AGREEMENT

THIS STANDARD LARGE
GENERATORINTERCONNECTION AGREEMENT("Agreement") is made and entered into
this 5th day of November 2007 by and between NGP Blue
Mountain I LLC (NGP)organized and existing under the laws of the Delaware("Interconnection Customer"), and Sierra Pacific
Power Company (Sierra), a corporation organized and existing under the laws of
the State of Nevada (Transmission Provider and Transmission Owner").
Interconnection Customer and Transmission Provider each may be referred to as a
"Party" or collectively as the "Parties."

Recitals

WHEREAS,Transmission
Provider operates the Transmission System; and

WHEREAS,Interconnection
  Customer intends to own, lease and/or control and operate the Generating
  Facility identified as a Large Generating Facility in Appendix C to this
  Agreement; and,

WHEREAS,Interconnection
Customer and Transmission Provider have agreed to enter into this Agreement for
the purpose of interconnecting the Large Generating Facility with the
Transmission System;

NOW, THEREFORE,in
consideration of and subject to the mutual covenants contained herein, it is
agreed:

When used in this Standard Large
Generator Interconnection Agreement, terms with initial capitalization that are
not defined in Article 1 shall have the meanings specified in the Article in
which they are used or the Open Access Transmission Tariff (Tariff).

Article 1. Definitions

Adverse System Impactshall mean the negative effects due to technical or operational limits on
conductors or equipment being exceeded that may compromise the safety and
reliability of the electric system.

Affected Systemshall mean
an electric system other than the Transmission Provider's Transmission System
that may be affected by the proposed interconnection.

Affected System Operatorshall mean the entity that operates an Affected System.

|Issued by: Mario Villar | 1 | Effective
|----------------------- | - | ---------
|Executive, Transmission |   |          
|Issued on:              |   |          

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Affiliateshall mean, with
respect to a corporation, partnership or other entity, each such other
corporation, partnership or other entity that directly or indirectly, through
one or more intermediaries, controls, is controlled by, or is under common
control with, such corporation, partnership or other entity.

Ancillary Servicesshall
mean those services that are necessary to support the transmission of capacity
and energy from resources to loads while maintaining reliable operation of the
Transmission Provider's Transmission System in accordance with Good Utility
Practice.

Applicable Laws and
Regulationsshall mean all duly promulgated applicable federal, state and
local laws, regulations, rules, ordinances, codes, decrees, judgments,
directives, or judicial or administrative orders, permits and other duly
authorized actions of any Governmental Authority.

Applicable Reliability Councilshall mean the reliability council applicable to the Transmission System to
which the Generating Facility is directly interconnected.

Applicable Reliability
Standardsshall mean the requirements and guidelines of NERC, the Applicable
Reliability Council, and the Control Area of the Transmission System to which
the Generating Facility is directly interconnected.

Base Caseshall mean the
base case power flow, short circuit, and stability data bases used for the
Interconnection Studies by the Transmission Provider or Interconnection
Customer.

Breachshall mean the
failure of a Party to perform or observe any material term or condition of the
Standard Large Generator Interconnection Agreement.

Breaching Partyshall mean
a Party that is in Breach of the Standard Large Generator Interconnection
Agreement.

Business Dayshall mean
Monday through Friday, excluding Federal Holidays.

Calendar Dayshall mean
any day including Saturday, Sunday or a Federal Holiday.

Clusteringshall mean the
process whereby a group of Interconnection Requests is studied together, instead
of serially, for the purpose of conducting the Interconnection System Impact
Study.

Commercial Operationshall
mean the status of a Generating Facility that has commenced generating
electricity for sale, excluding electricity generated during Trial
Operation.

Commercial Operation Dateof a unit shall mean the date on which the Generating Facility commences
Commercial Operation as agreed to by the Parties pursuant to Appendix E to the
Standard Large Generator Interconnection Agreement.

|Issued by: Mario Villar | 2 | Effective: 11/5/2007
|----------------------- | - | --------------------
|Executive, Transmission |  
|Issued on:              |   |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Confidential Informationshall mean any confidential, proprietary or trade secretinformation
of a plan, specification, pattern, procedure, design, device, list, concept,
policy or compilation relating to the present or planned business of a Party,
which is designated as confidential by the Party supplying the information,
whether conveyed orally, electronically, in writing, through inspection, or
otherwise.

Control Areashall mean an
electrical system or systems bounded by interconnection metering and telemetry,
capable of controlling generation to maintain its interchange schedule with
other Control Areas and contributing to frequency regulation of the
interconnection. A Control Area must be certified by the Applicable Reliability
Council.

Defaultshall mean the
failure of a Breaching Party to cure its Breach in accordance with Article 17 of
the Standard Large Generator Interconnection Agreement.

Dispute Resolutionshall
mean the procedure for resolution of a dispute between the Parties in which they
will first attempt to resolve the dispute on an informal basis.

Distribution Systemshall
mean the Transmission Provider's facilities and equipment used to transmit
electricity to ultimate usage points such as homes and industries directly from
nearby generators or from interchanges with higher voltage transmission networks
which transport bulk power over longer distances. The voltage levels at which
distribution systems operate differ among areas.

Distribution Upgradesshall mean the additions, modifications, and upgrades to the Transmission
Provider's Distribution System at or beyond the Point of Interconnection to
facilitate interconnection of the Generating Facility and render the
transmission service necessary to effect Interconnection Customer's wholesale
sale of electricity in interstate commerce. Distribution Upgrades do not include
Interconnection Facilities.

Effective Date shall mean
the date on which the Standard Large Generator Interconnection Agreement becomes
effective upon execution by the Parties subject to acceptance by FERC, or if
filed unexecuted, upon the date specified by FERC.

Emergency Conditionshall
mean a condition or situation: (1) that in the judgment of the Party making the
claim is imminently likely to endanger life or property; or (2) that, in the
case of a Transmission Provider, is imminently likely (as determined in a
non-discriminatory manner) to cause a material adverse effect on the security
of, or damage to Transmission Provider's Transmission System, Transmission
Provider's Interconnection Facilities or the electric systems of others to which
the Transmission Provider's Transmission System is directly connected; or (3)
that, in the case of Interconnection Customer, is imminently likely (as
determined in a nondiscriminatory manner) to cause a material adverse effect on
the security of, or damage to, the Generating Facility or Interconnection
Customer's Interconnection Facilities. System restoration and black start shall
be considered Emergency Conditions; provided, that Interconnection Customer
is

|Issued by: Mario Villar | 3 | Effective: 11/5/2007
|----------------------- | - | --------------------
|Executive, Transmission |  
|Issued on:              |   |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

not obligated by the Standard Large Generator Interconnection
Agreement to possess black start capability.

Energy Resource
Interconnection Serviceshall mean an Interconnection Service that allows
the Interconnection Customer to connect its Generating Facility to the
Transmission Provider's Transmission System to be eligible to deliver the
Generating Facility's electric output using the existing firm or nonfirm
capacity of the Transmission Provider's Transmission System on an as available
basis. Energy Resource Interconnection Service in and of itself does not convey
transmission service.

Engineering &
Procurement (E&P) Agreementshall mean an agreement that
authorizes the Transmission Provider to begin engineering and procurement of
long lead-time items necessary for the establishment of the interconnection in
order to advance the implementation of the Interconnection Request.

Environmental Lawshall
mean Applicable Laws or Regulations relating to pollution or protection of the
environment or natural resources.

Federal Power Actshall
mean the Federal Power Act, as amended, 16 U.S.C. §§ 791a et seq.

FERCshall mean the
Federal Energy Regulatory Commission (Commission) or its successor.

Force Majeureshall mean
any act of God, labor disturbance, act of the public enemy, war, insurrection,
riot, fire, storm or flood, explosion, breakage or accident to machinery or
equipment, any order, regulation or restriction imposed by governmental,
military or lawfully established civilian authorities, or any other cause beyond
a Party's control. A Force Majeure event does not include acts of negligence or
intentional wrongdoing by the Party claiming Force Majeure.

Generating Facilityshall
mean Interconnection Customer's device for the production of electricity
identified in the Interconnection Request, but shall not include the
Interconnection Customer's Interconnection Facilities.

Generating Facility Capacityshall mean the net capacity of the Generating Facility and the aggregate net
capacity of the Generating Facility where it includes multiple energy production
devices.

Good Utility Practiceshall mean any of the practices, methods and acts engaged in or approved by
a significant portion of the electric industry during the relevant time period,
or any of the practices, methods and acts which, in the exercise of reasonable
judgment in light of the facts known at the time the decision was made, could
have been expected to accomplish the desired result at a reasonable cost
consistent with good business practices, reliability, safety and expedition.
Good Utility Practice is not intended to be limited to the optimum practice,
method, or act to the exclusion of all others, but rather to be acceptable
practices, methods, or acts generally accepted in the region.

Governmental Authorityshall mean any federal, state, local or other governmental regulatory or
administrative agency, court, commission,

|Issued by: Mario Villar | 4 | Effective: 11/5/2007
|----------------------- | - | --------------------
|Executive, Transmission |  
|Issued on:              |   |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

department, board, or other governmental subdivision,
legislature, rulemaking board, tribunal, or other governmental authority having
jurisdiction over the Parties, their respective facilities, or the respective
services they provide, and exercising or entitled to exercise any
administrative, executive, police, or taxing authority or power; provided,
however, that such term does not include Interconnection Customer, Transmission
Provider, or any Affiliate thereof.

Hazardous Substancesshall
mean any chemicals, materials or substances defined as or included in the
definition of "hazardous substances," 'hazardous wastes," "hazardous materials,"
"hazardous constituents," "restricted hazardous materials," "extremely hazardous
substances," "toxic substances," "radioactive substances," "contaminants,"
"pollutants," "toxic pollutants" or words of similar meaning and regulatory
effect under any applicable Environmental Law, or any other chemical, material
or substance, exposure to which is prohibited, limited or regulated by any
applicable Environmental Law.

Initial Synchronization Dateshall mean the date upon which the Generating Facility is initially
synchronized and upon which Trial Operation begins.

In-Service Dateshall mean
the date upon which the Interconnection Customer reasonably expects it will be
ready to begin use of the Transmission Provider's Interconnection Facilities to
obtain back feed power.

Interconnection Customershall mean any entity, including the Transmission Provider, Transmission
Owner or any of the Affiliates or subsidiaries of either, that proposes to
interconnect its Generating Facility with the Transmission Provider's
Transmission System.

Interconnection Customer's
Interconnection Facilitiesshall mean all facilities and equipment, as
identified in Appendix A of the Standard Large Generator Interconnection
Agreement, that are located between the Generating Facility and the Point of
Change of Ownership, including any modification, addition, or upgrades to such
facilities and equipment necessary to physically and electrically interconnect
the Generating Facility to the Transmission Provider's Transmission System.
Interconnection Customer's Interconnection Facilities are sole use
facilities.

Interconnection Facilitiesshall mean the Transmission Provider's Interconnection Facilities and the
Interconnection Customer's Interconnection Facilities. Collectively,
Interconnection Facilities include all facilities and equipment between the
Generating Facility and the Point of Interconnection, including any
modification, additions or upgrades that are necessary to physically and
electrically interconnect the Generating Facility to the Transmission Provider's
Transmission System. Interconnection Facilities are sole use facilities and
shall not include Distribution Upgrades, Stand Alone Network Upgrades or Network
Upgrades.

Interconnection Facilities
Studyshall mean a study conducted by the Transmission Provider or a third
party consultant for the Interconnection Customer to determine a list of
facilities (including Transmission Provider's Interconnection Facilities and
Network Upgrades as identified in the Interconnection System Impact Study), the
cost of those facilities, and the

|Issued by: Mario Villar | 5 | Effective: 11/5/2007
|----------------------- | - | --------------------
|Executive, Transmission |  
|Issued on:              |   |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

time required to interconnect the Generating Facility with the
Transmission Provider's Transmission System. The scope of the study is defined
in Section 8 of the Standard Large Generator Interconnection Procedures.

Interconnection Facilities
Study Agreementshall mean the form of agreement contained in Appendix 4 of
the Standard Large Generator Interconnection Procedures for conducting the
Interconnection Facilities Study.

Interconnection Feasibility
Studyshall mean a preliminary evaluation of the system impact and cost of
interconnecting the Generating Facility to the Transmission Provider's
Transmission System, the scope of which is described in Section 6 of the
Standard Large Generator Interconnection Procedures.

Interconnection Feasibility
Study Agreementshall mean the form of agreement contained in Appendix 2 of
the Standard Large Generator Interconnection Procedures for conducting the
Interconnection Feasibility Study.

InterconnectionRequest
shall mean an Interconnection Customer's request, in the form of Appendix 1 to
the Standard Large Generator, in accordance with the Tariff, to interconnect a
new Generating Facility, or to increase the capacity of, or make a Material
Modification to the operating characteristics of, an existing Generating
Facility that is interconnected with the Transmission Provider's Transmission
System.

Interconnection Serviceshall mean the service provided by the Transmission Provider associated with
interconnecting the Interconnection Customer's Generating Facility to the
Transmission Provider's Transmission System and enabling it to receive electric
energy and capacity from the Generating Facility at the Point of
Interconnection, pursuant to the terms of the Standard Large Generator
Interconnection Agreement and, if applicable, the Transmission Provider's
Tariff.

Interconnection Study shall mean any of the following studies: the Interconnection Feasibility Study,
the Interconnection System Impact Study, and the Interconnection Facilities
Study described in the Standard Large Generator Interconnection Procedures.

Interconnection System
Impact Studyshall mean an engineering study that evaluates the
impact of the proposed interconnection on the safety and reliability of
Transmission Provider's Transmission System and, if applicable, an Affected
System. The study shall identify and detail the system impacts that would result
if the Generating Facility were interconnected without project modifications or
system modifications, focusing on the Adverse System Impacts identified in the
Interconnection Feasibility Study, or to study potential impacts, including but
not limited to those identified in the Scoping Meeting as described in the
Standard Large Generator Interconnection Procedures.

Interconnection System Impact
Study Agreementshall mean the form of agreement contained in Appendix 3 of
the Standard Large Generator Interconnection Procedures for conducting the
Interconnection System Impact Study.

|Issued by: Mario Villar | 6 | Effective: 11/5/2007
|----------------------- | - | --------------------
|Executive, Transmission |  
|Issued on:              |   |                     

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|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

IRSshall mean the Internal
Revenue Service.

Joint Operating Committeeshall be a group made up of representatives from Interconnection Customers
and the Transmission Provider to coordinate operating and technical
considerations of Interconnection Service.

Large Generating Facilityshall mean a Generating Facility having a Generating Facility Capacity of
more than 20 MW.

Lossshall mean any and
all losses relating to injury to or death of any person or damage to property,
demand, suits, recoveries, costs and expenses, court costs, attorney fees, and
all other obligations by or to third parties, arising out of or resulting from
the other Party's performance, or non-performance of its obligations under the
Standard Large Generator Interconnection Agreement on behalf of the indemnifying
Party, except in cases of gross negligence or intentional wrongdoing by the
indemnifying Party.

Material Modificationshall mean those modifications that have a material impact on the cost or
timing of any Interconnection Request with a later queue priority date.

Metering Equipmentshall
mean all metering equipment installed or to be installed at the Generating
Facility pursuant to the Standard Large Generator Interconnection Agreement at
the metering points, including but not limited to instrument transformers,
MWh-meters, data acquisition equipment, transducers, remote terminal unit,
communications equipment, phone lines, and fiber optics.

NERCshall mean the North
American Electric Reliability Council or its successor organization.

Network Resourceshall
mean any designated generating resource owned, purchased, or leased by a Network
Customer under the Network Integration Transmission Service Tariff. Network
Resources do not include any resource, or any portion thereof, that is committed
for sale to third parties or otherwise cannot be called upon to meet the Network
Customer's Network Load on a non-interruptible basis.

Network Resource
Interconnection Serviceshall mean an Interconnection Service that allows
the Interconnection Customer to integrate its Large Generating Facility with the
Transmission Provider's Transmission System (1) in a manner comparable to that
in which the Transmission Provider integrates its generating facilities to serve
native load customers; or (2) in an RIO or ISO with market based congestion
management, in the same manner as Network Resources. Network Resource
Interconnection Service in and of itself does not convey transmission
service.

Network Upgradesshall
mean the additions, modifications, and upgrades to the Transmission Provider's
Transmission System required at or beyond the point at which the Interconnection
Facilities connect to the Transmission Provider's Transmission System to
accommodate the interconnection of the Large Generating Facility to the
Transmission Provider's Transmission System.

|Issued by: Mario Villar | 7 | Effective: 11/5/2007
|----------------------- | - | --------------------
|Executive, Transmission |  
|Issued on:              |   |                     

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|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Notice of Disputeshall
mean a written notice of a dispute or claim that arises out of or in connection
with the Standard Large Generator Interconnection Agreement or its
performance.

Optional Interconnection Studyshall mean a sensitivity analysis based on assumptions specified by the
Interconnection Customer in the Optional Interconnection Study Agreement.

Optional Interconnection Study
Agreementshall mean the form of agreement contained in Appendix 5 of the
Standard Large Generator Interconnection Procedures for conducting the Optional
Interconnection Study.

Party or Partiesshall
mean Transmission Provider, Transmission Owner, Interconnection Customer or any
combination of the above.

Point of Change of Ownershipshall mean the point, as set forth in Appendix A to the Standard Large
Generator Interconnection Agreement, where the Interconnection Customer's
Interconnection Facilities connect to the Transmission Provider's
Interconnection Facilities.

Point of Interconnectionshall mean the point, as set forth in Appendix A to the Standard Large
Generator Interconnection Agreement, where the Interconnection Facilities
connect to the Transmission Provider's Transmission System.

Queue Positionshall mean
the order of a valid Interconnection Request, relative to all other pending
valid Interconnection Requests, that is established based upon the date and time
of receipt of the valid Interconnection Request by the Transmission
Provider.

Reasonable Effortsshall
mean, with respect to an action required to be attempted or taken by a Party
under the Standard Large Generator Interconnection Agreement, efforts that are
timely and consistent with Good Utility Practice and are otherwise substantially
equivalent to those a Party would use to protect its own interests.

Scoping Meeting shall mean
the meeting between representatives of the Interconnection Customer and
Transmission Provider conducted for the purpose of discussing alternative
interconnection options, to exchange information including any transmission data
and earlier study evaluations that would be reasonably expected to impact such
interconnection options, to analyze such information, and to determine the
potential feasible Points of Interconnection.

Site Controlshall mean
documentation reasonably demonstrating: (1) ownership of, a leasehold interest
in, or a right to develop a site for the purpose of constructing the Generating
Facility; (2) an option to purchase or acquire a leasehold site for such
purpose; or (3) an exclusivity or other business relationship between
Interconnection Customer and the entity having the right to sell, lease or grant
interconnection Customer the right to possess or occupy a site for such
purpose.

Small Generating Facilityshall mean a Generating Facility that has a Generating Facility Capacity of
no more than 20 MW.

|Issued by: Mario Villar | 8 | Effective: 11/5/2007
|----------------------- | - | --------------------
|Executive, Transmission |  
|Issued on:              |   |                     

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|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Stand Alone Network Upgradesshall mean Network Upgrades that an Interconnection Customer may construct
without affecting day-to-day operations of the Transmission System during their
construction. Both the Transmission Provider and the Interconnection Customer
must agree as to what constitutes Stand Alone Network Upgrades and identify them
in Appendix A to the Standard Large Generator Interconnection Agreement.

Standard Large Generator
Interconnection Agreement (LGIA)shall mean the form of interconnection
agreement applicable to an Interconnection Request pertaining to a Large
Generating Facility that is included in the Transmission Provider's Tariff.

Standard Large Generator
Interconnection Procedures (LGIP)shall mean the interconnection procedures
applicable to an Interconnection Request pertaining to a Large Generating
Facility that are included in the Transmission Provider's Tariff.

System Protection Facilitiesshall mean the equipment, including necessary protection signal
communications equipment, required to protect (1) the Transmission Provider's
Transmission System from faults or other electrical disturbances occurring at
the Generating Facility and (2) the Generating Facility from faults or other
electrical system disturbances occurring on the Transmission Provider's
Transmission System or on other delivery systems or other generating systems to
which the Transmission Provider's Transmission System is directly connected.

Tariffshall mean the
Transmission Provider's Tariff through which open access transmission service
and Interconnection Service are offered, as filed with FERC, and as amended or
supplemented from time to time, or any successor tariff.

Transmission Ownershall
mean an entity that owns, leases or otherwise possesses an interest in the
portion of the Transmission System at the Point of Interconnection and may be a
Party to the Standard Large Generator Interconnection Agreement to the extent
necessary.

Transmission Providershall mean the public utility (or its designated agent) that owns, controls,
or operates transmission or distribution facilities used for the transmission of
electricity in interstate commerce and provides transmission service under the
Tariff. The term Transmission Provider should be read to include the
Transmission Owner when the Transmission Owner is separate from the Transmission
Provider.

Transmission Provider's
Interconnection Facilitiesshall mean all facilities and equipment owned,
controlled or operated by the Transmission Provider from the Point of Change of
Ownership to the Point of Interconnection as identified in Appendix A to the
Standard Large Generator Interconnection Agreement, including any modifications,
additions or upgrades to such facilities and equipment. Transmission Provider's
Interconnection Facilities are sole use facilities and shall not include
Distribution Upgrades, Stand Alone Network Upgrades or Network Upgrades.

|Issued by: Mario Villar | 9 | Effective: 11/5/2007
|----------------------- | - | --------------------
|Executive, Transmission |  
|Issued on:              |   |                     

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|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Transmission Systemshall
mean the facilities owned, controlled or operated by the Transmission Provider
or Transmission Owner that are used to provide transmission service under the
Tariff.

Trial Operationshall mean
the period during which Interconnection Customer is engaged in on-site test
operations and commissioning of the Generating Facility prior to Commercial
Operation.

Article 2. Effective Date, Term, and Termination

|2.1 | Effective Date.This Agreement shall
      become effective upon execution by the Parties.                                                                                                                                                                                                                                                                                                  
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|    |                                                                                                                                                                                                                                                                                                                                                                                            
|2.2 | Term of Agreement.Subject to the
      provisions of Article 2.3, this LGIA shall remain in effect for a period
      of twenty (20) years from the Effective Date or such other longer period
      as Interconnection Customer may request (Term to be specified in
      individual agreements) and shall be automatically renewed for each
      successive one-year period thereafter.
|    |                                                                                                                                                                                                                                                                                                                                                                                            
|2.3 | Termination Procedures.                                                                                                                                                                                                                                                                                                                                                                    

| | 2.3.1 | Written Notice.This LGIA may be terminated by
      Interconnection Customer after giving Transmission Provider ninety (90)
      Calendar Days advance written notice, or by Transmission Provider
      notifying FERC after the Generating Facility permanently ceases Commercial
      Operation.
| | ----- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |       |                                                                                                                                                                                                                                                                                                      
| | 2.3.2 | Default.Either Party may terminate this LGIA in
      accordance with Article 17.                                                                                                                                                                                                                    
| |       |                                                                                                                                                                                                                                                                                                      
| | 2.3.3 | Notwithstanding Articles 2.3.1 and 2.3.2, no termination
      shall become effective until the Parties have complied with all Applicable
      Laws and Regulations applicable to such
termination.                                                                                                 

|2.4 | Termination Costs.If a Party elects to terminate
      this Agreement pursuant to Article 2.3 above, each Party shall pay all
      costs incurred (including any cancellation costs relating to orders or
      contracts for Interconnection Facilities and equipment) or charges
      assessed by the other Party, as of the date of the other Party's receipt
      of such notice of termination, that are the responsibility of the
      Terminating Party under this LGIA. In the event of termination by a Party,
      the Parties shall use commercially Reasonable Efforts to mitigate the
      costs, damages and charges arising as a consequence of termination. Upon
      termination of this LGIA:
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 2.4.1 | With respect to any portion of Transmission Provider's
      Interconnection Facilities that have not yet been constructed or
      installed, Transmission Provider shall to the extent possible and with
      Interconnection Customer's authorization cancel any pending orders of, or
      return, any materials or equipment for, or contracts for construction of,
      such facilities; provided that in the event Interconnection Customer
      elects not to authorize such cancellation, Interconnection Customer shall
      assume all payment obligations with respect to
| | ----- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Issued by: Mario Villar | 10 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

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|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

such materials, equipment, and
contracts, and Transmission Provider shall deliver such material and equipment,
and, if necessary, assign such contracts, to Interconnection Customer as soon as
practicable, at Interconnection Customer's expense. To the extent that
Interconnection Customer has already paid Transmission Provider for any or all
such costs of materials or equipment not taken by Interconnection Customer,
Transmission Provider shall promptly refund such amounts to Interconnection
Customer, less any costs, including penalties incurred by Transmission Provider
to cancel any pending orders of or return such materials, equipment, or
contracts.

If an Interconnection Customer
terminates this LGIA, it shall be responsible for all costs incurred in
association with that Interconnection Customer's interconnection, including any
cancellation costs relating to orders or contracts for Interconnection
Facilities and equipment, and other expenses including any Network Upgrades for
which Transmission Provider has incurred expenses and has not been reimbursed by
Interconnection Customer.

| | 2.4.2 | Transmission Provider may, at its option, retain any
      portion of such materials, equipment, or facilities that Interconnection
      Customer chooses not to accept delivery of, in which case Transmission
      Provider shall be responsible for all costs associated with procuring such
      materials, equipment, or facilities.                                
| | ----- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |       |                                                                                                                                                                                                                                                                                                                                                                             
| | 2.4.3 | With respect to any portion of the Interconnection
      Facilities, and any other facilities already installed or constructed
      pursuant to the terms of this LGIA, Interconnection Customer shall be
      responsible for all costs associated with the removal, relocation or other
      disposition or retirement of such materials, equipment, or
    facilities.

|2.5 | Disconnection.Upon termination of this LGIA, the
      Parties will take all appropriate steps to disconnect the Large Generating
      Facility from the Transmission System. All costs required to effectuate
      such disconnection shall be borne by the terminating Party, unless such
      termination resulted from the non-terminating Party's Default of this LGIA
      or such non-terminating Party otherwise is responsible for these costs
      under this LGIA.                                                                                                                                                          
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|2.6 | Survival.This LGIA shall continue in effect after
      termination to the extent necessary to provide for final billings and
      payments and for costs incurred hereunder, including billings and payments
      pursuant to this LGIA; to permit the determination and enforcement of
      liability and indemnification obligations arising from acts or events that
      occurred while this LGIA was in effect; and to permit each Party to have
      access to the lands of the other Party pursuant to this LGIA or other
      applicable agreements, to disconnect, remove or salvage its own facilities
      and equipment.

|Issued by: Mario Villar | 11 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

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|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Article 3. Regulatory Filings

|3.1 | Filing.Transmission Provider shall file this LGIA
      (and any amendment hereto) with the appropriate Governmental Authority, if
      required. Interconnection Customer may request that any information so
      provided be subject to the confidentiality provisions of Article 22. If
      Interconnection Customer has executed this LGIA, or any amendment thereto,
      Interconnection Customer shall reasonably cooperate with Transmission
      Provider with respect to such filing and to provide any information
      reasonably requested by Transmission Provider needed to comply with
      applicable regulatory requirements.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Article 4. Scope of Service

|4.1 | Interconnection Product Options.Interconnection
      Customer has selected the following (checked) type of Interconnection
      Service:
|--- | ------------------------------------------------------------------------------------------------------------------------------------------

| | 4.1.1 | Energy Resource Interconnection
  Service.
| | ----- | ------------------------------------------

| | 4.1.1.1 | The Product.Energy Resource Interconnection
      Service allows Interconnection Customer to connect the Large Generating
      Facility to the Transmission System and be eligible to deliver the Large
      Generating Facility's output using the existing firm or non-firm capacity
      of the Transmission System on an "as available" basis. To the extent
      Interconnection Customer wants to receive Energy Resource Interconnection
      Service, Transmission Provider shall construct facilities identified in
      Attachment A.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
| | ------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
| | 4.1.1.2 | Transmission Delivery Service Implications.Under
      Energy Resource Interconnection Service, Interconnection Customer will be
      eligible to inject power from the Large Generating Facility into and
      deliver power across the interconnecting Transmission Provider's
      Transmission System on an "as available"basis up to the amount
      of MWs identified in the applicable stability and steady state studies to
      the extent the upgrades initially required to qualify for Energy Resource
      Interconnection Service have been constructed. Where eligible to do so
      (e.g.,P M , ISO-NE, NYISO), Interconnection Customer may place a
      bid to sell into the market up to the maximum identified Large Generating
      Facility output, subject to any conditions specified in the
      interconnection service approval, and the Large Generating Facility will
      be dispatched to the extent Interconnection Customer's bid clears. In all
      other instances, no transmission delivery service from the Large
      Generating Facility is assured, but Interconnection Customer may obtain
      Point-to-Point Transmission Service, Network

|Issued by: Mario Villar | 12 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

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|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Integration Transmission Service, or
be used for secondary network transmission service, pursuant to Transmission
Provider's Tariff, up to the maximum output identified in the stability and
steady state studies. In those instances, in order for Interconnection Customer
to obtain the right to deliver or inject energy beyond the Large Generating
Facility Point of Interconnection or to improve its ability to do so,
transmission delivery service must be obtained pursuant to the provisions of
Transmission Provider's Tariff. The Interconnection Customer's ability to inject
its Large Generating Facility output beyond the Point of Interconnection,
therefore, will depend on the existing capacity of Transmission Provider's
Transmission System at such time as a transmission service request is made that
would accommodate such delivery. The provision of firm Point-to-Point
Transmission Service or Network Integration Transmission Service may require the
construction of additional Network Upgrades.

| | 4.1.2 | Network Resource Interconnection Service.
  ()
| | ----- | ----------------------------------------------

| | **4.1.2.1** | **The Product.** Transmission
      Provider must conduct the necessary studies and construct the Network
      Upgrades needed to integrate the Large Generating Facility (1) in a manner
      comparable to that in which Transmission Provider integrates its
      generating facilities to serve native load customers; or (2) in an ISO or
      RTO with market based congestion management, in the same manner as all
      Network Resources. To the extent Interconnection Customer wants to receive
      Network Resource Interconnection Service, Transmission Provider shall
      construct the facilities identified in Attachment A to this LGIA.                                                                                                                                                                                                                                                                                                                                                                                                                                           
| | ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
| | **4.1.2.2** | Transmission Delivery Service
      Implications. Network Resource Interconnection Service allows
      Interconnection Customer's Large Generating Facility to be designated by
      any Network Customer under the Tariff on Transmission Provider's
      Transmission System as a Network Resource, up to the Large Generating
      Facility's full output, on the same basis as existing Network Resources
      interconnected to Transmission Provider's Transmission System, and to be
      studied as a Network Resource on the assumption that such a designation
      will occur. Although Network Resource Interconnection Service does not
      convey a reservation of transmission service, any Network Customer under
      the Tariff can utilize its network service under the Tariff to obtain
      delivery of energy from the interconnected Interconnection Customer's
      Large Generating Facility in the same manner as it accesses Network
      Resources. A Large Generating Facility receiving Network Resource
      Interconnection Service may also be used to provide

|Issued by: Mario Villar | 13 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

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|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Ancillary Services after technical
studies and/or periodic analyses are performed with respect to the Large
Generating Facility's ability to provide any applicable Ancillary Services,
provided that such studies and analyses have been or would be required in
connection with the provision of such Ancillary Services by any existing Network
Resource. However, if an Interconnection Customer's Large Generating Facility
has not been designated as a Network Resource by any load, it cannot be required
to provide Ancillary Services except to the extent such requirements extend to
all generating facilities that are similarly situated. The provision of Network
Integration Transmission Service or firm Point-to-Point Transmission Service may
require additional studies and the construction of additional upgrades. Because
such studies and upgrades would be associated with a request for delivery
service under the Tariff, cost responsibility for the studies and upgrades would
be in accordance with FERC's policy for pricing transmission delivery
services.

Network Resource Interconnection
Service does not necessarily provide Interconnection Customer with the
capability to physically deliver the output of its Large Generating Facility to
any particular load on Transmission Provider's Transmission System without
incurring congestion costs. In the event of transmission constraints on
Transmission Provider's Transmission System, Interconnection Customer's Large
Generating Facility shall be subject to the applicable congestion management
procedures in Transmission Provider's Transmission System in the same manner as
Network Resources.

There is no requirement either at the
time of study or interconnection, or at any point in the future, that
Interconnection Customer's Large Generating Facility be designated as a Network
Resource by a Network Service Customer under the Tariff or that Interconnection
Customer identify a specific buyer (or sink). To the extent a Network Customer
does designate the Large Generating Facility as a Network Resource, it must do
so pursuant to Transmission Provider's Tariff.

Once an Interconnection Customer
satisfies the requirements for obtaining Network Resource Interconnection
Service, any future transmission service request for delivery from the Large
Generating Facility within Transmission Provider's Transmission System of any
amount of capacity and/or energy, up to the amount initially studied, will not
require that any additional studies be performed or that any further upgrades
associated with such Large

|Issued by: Mario Villar | 14 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

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|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Generating Facility be undertaken,
regardless of whether or not such Large Generating Facility is everdesignated by a Network Customer as a Network Resource and regardless of
changes in ownership of the Large Generating Facility. However, the reduction or
elimination of congestion or redispatch costs may require additional studies and
the construction of additional upgrades.

To the extent Interconnection Customer
enters into an arrangement for long term transmission service for deliveries
from the Large Generating Facility outside Transmission Provider's Transmission
System, such request may require additional studies and upgrades in order for
Transmission Provider to grant such request.

|4.2 | Provision of Service.Transmission Provider shall
      provide Interconnection Service for the Large Generating Facility at the
      Point of Interconnection.                                                                                                                                                                                                                                                                                       
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|4.3 | Performance Standards.Each Party shall perform
      all of its obligations under this LGIA in accordance with Applicable Laws
      and Regulations, Applicable Reliability Standards, and Good Utility
      Practice, and to the extent a Party is required or prevented or limited in
      taking any action by such regulations and standards, such Party shall not
      be deemed to be in Breach of this LGIA for its compliance
  therewith.
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|4.4 | No Transmission Delivery Service.The execution of
      this LGIA does not constitute a request for, nor the provision of, any
      transmission delivery service under Transmission Provider's Tariff, and
      does not convey any right to deliver electricity to any specific customer
      or Point of Delivery.                                                                                                                              
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|4.5 | Interconnection Customer Provided Services.The
      services provided by Interconnection Customer under this LGIA are set
      forth in Article 9.6 and Article 13.5.1. Interconnection Customer shall be
      paid for such services in accordance with Article
11.6.                                                                                                                                                                             

|Article 5. Interconnection Facilities Engineering,
      Procurement, and Construction
|--------------------------------------------------------------------------------------

|5.1 | Options.Unless otherwise mutually agreed to
      between the Parties, Interconnection Customer shall select the In-Service
      Date, Initial Synchronization Date, and Commercial Operation Date; and
      either Standard Option or Alternate Option set forth below for completion
      of Transmission Provider's Interconnection Facilities and Network Upgrades
      as set forth in Appendix A, Interconnection Facilities and Network
      Upgrades, and such dates and selected option shall be set forth in
      Appendix B, Milestones.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 5.1.1 | Standard Option.Transmission Provider shall
      design, procure, and construct Transmission Provider's Interconnection
      Facilities and Network Upgrades, using Reasonable Efforts to complete
      Transmission Provider's Interconnection Facilities and Network Upgrades by
      the dates set forth in Appendix B,
| | ----- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Issued by: Mario Villar | 15 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

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|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Milestones. Transmission Provider
shall not be required to undertake any action which is inconsistent with its
standard safety practices, its material and equipment specifications, its design
criteria and construction procedures, its labor agreements, and Applicable Laws
and Regulations. In the event Transmission Provider reasonably expects that it
will not be able to complete Transmission Provider's Interconnection Facilities
and Network Upgrades by the specified dates, Transmission Provider shall
promptly provide written notice to Interconnection Customer and shall undertake
Reasonable Efforts to meet the earliest dates thereafter.

| | 5.1.2 | Alternate Option.If the dates designated by
      Interconnection Customer are acceptable to Transmission Provider,
      Transmission Provider shall so notify Interconnection Customer within
      thirty (30) Calendar Days, and shall assume responsibility for the design,
      procurement and construction of Transmission Provider's Interconnection
      Facilities by the designated dates.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
| | ----- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
| | 5.1.3 | Option to Build.If the dates designated by
      Interconnection Customer are not acceptable to Transmission Provider,
      Transmission Provider shall so notify Interconnection Customer within
      thirty (30) Calendar Days, and unless the Parties agree otherwise,
      Interconnection Customer shall have the option to assume responsibility
      for the design, procurement and construction of Transmission Provider's
      Interconnection Facilities and Stand Alone Network Upgrades on the dates
      specified in Article 5.1.2. Transmission Provider and Interconnection
      Customer must agree as to what constitutes Stand Alone Network Upgrades
      and identify such Stand Alone Network Upgrades in Appendix A. Except for
      Stand Alone Network Upgrades, Interconnection Customer shall have no right
      to construct Network Upgrades under this option.                                                                                                                                                                                                       
| |       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
| | 5.1.4 | Negotiated Option.If Interconnection Customer
      elects not to exercise its option under Article 5.1.3, Option to Build,
      Interconnection Customer shall so notify Transmission Provider within
      thirty (30) Calendar Days, and the Parties shall in good faith attempt to
      negotiate terms and conditions (including revision of the specified dates,
      the provision of incentives or the procurement and construction of a
      portion of Transmission Provider's Interconnection Facilities and Stand
      Alone Network Upgrades by Interconnection Customer) pursuant to which
      Transmission Provider is responsible for the design, procurement and
      construction of Transmission Provider's Interconnection Facilities and
      Network Upgrades. If the Parties are unable to reach agreement on such
      terms and conditions, Transmission Provider shall assume responsibility
      for the design, procurement and construction of Transmission Provider's
      Interconnection Facilities and Network Upgrades pursuant to 5.1.1,
      Standard Option.

|5.2 | General Conditions Applicable to Option to Build.If Interconnection Customer assumes responsibility for the design,
      procurement and construction of Transmission Provider's Interconnection
      Facilities and Stand Alone Network Upgrades,
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Issued by: Mario Villar | 16 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

| | (1) Interconnection Customer shall engineer, procure
      equipment, and construct Transmission Provider's Interconnection
      Facilities and Stand Alone Network Upgrades (or portions thereof) using
      Good Utility Practice and using standards and specifications provided in
      advance by Transmission Provider;                                                                                                                                                                   
| | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
| | (2) Interconnection Customer's engineering, procurement
      and construction of Transmission Provider's Interconnection Facilities and
      Stand Alone Network Upgrades shall comply with all requirements of law and
      Applicable Reliability Standards to which Transmission Provider would be
      subject in the engineering, procurement or construction of Transmission
      Provider's Interconnection Facilities and Stand Alone Network Upgrades;                               
| |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
| | (3) Transmission Provider shall review and approve the
      engineering design, equipment acceptance tests, and the construction of
      Transmission Provider's Interconnection Facilities and Stand Alone Network
      Upgrades;                                                                                                                                                                                                                                                              
| |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
| | (4) prior to commencement of construction,
      Interconnection Customer shall provide to Transmission Provider a schedule
      for construction of Transmission Provider's Interconnection Facilities and
      Stand Alone Network Upgrades, and shall promptly respond to requests for
      information from Transmission Provider;                                                                                                                                                          
| |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
| | (5) at any time during construction, Transmission
      Provider shall havethe right to gain unrestricted access to
      Transmission Provider's Interconnection Facilities and Stand Alone Network
      Upgrades and to conduct inspections of the same;                                                                                                                                                                                                                                        
| |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
| | (6) at any time during construction, should any phase of
      the engineering, equipment procurement, or construction of Transmission
      Provider's Interconnection Facilities and Stand Alone Network Upgrades not
      meet the standards and specifications provided by Transmission Provider,
      Interconnection Customer shall be obligated to remedy deficiencies in that
      portion of Transmission Provider's Interconnection Facilities and Stand
      Alone Network Upgrades;
| |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
| | (7) Interconnection Customer shall indemnify Transmission
      Provider for claims arising from Interconnection Customer's construction
      of Transmission Provider's Interconnection Facilities and Stand Alone
      Network Upgrades under the terms and procedures applicable to Article 18.1
      Indemnity;                                                                                                                                                                             
| |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
| | (8) Interconnection Customer shall transfer control of
      Transmission Provider's Interconnection Facilities and Stand Alone Network
      Upgrades to Transmission Provider;                                                                                                                                                                                                                                                                                                                   
| |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
| | (9) Unless Parties otherwise agree, interconnection
      Customer shall transfer ownership of Transmission Provider's
      Interconnection Facilities and Stand-Alone Network Upgrades to
      Transmission Provider;                                                                                                                                                                                                                                                                           
| |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
| | (10) Transmission Provider shall approve and accept for
      operation and maintenance Transmission Provider's Interconnection
      Facilities and Stand Alone Network Upgrades to the extent engineered,
      procured, and constructed in accordance with this Article 5.2; and                                                                                                                                                                                                               

|Issued by: Mario Villar | 17 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |    |                     
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                                      | 
|-------------------------------------------- | ------------------------------------ | 
|FERC Electric Tariff                         | Service Agreement No.
      07-01534
|Third Revised Volume No. 1                   |                                      | 
|Open Access Transmission Tariff              |                                      | 

(11) Interconnection Customer shall
deliver to Transmission Provider "as-built" drawings, information, and any other
documents that are reasonably required by Transmission Provider to assure that
the Interconnection Facilities and Stand-Alone Network Upgrades are built to the
standards and specifications required by Transmission Provider.

|5.3 | Power System Stabilizers.The Interconnection
      Customer shall procure, install, maintain and operate Power System
      Stabilizers in accordance with the guidelines and procedures established
      by the Applicable Reliability Council. Transmission Provider reserves the
      right to reasonably establish minimum acceptable settings for any
      installed Power System Stabilizers, subject to the design and operating
      limitations of the Large Generating Facility. If the Large Generating
      Facility's Power System Stabilizers are removed from service or not
      capable of automatic operation, Interconnection Customer shall immediately
      notify Transmission Provider's system operator, or its designated
      representative. The requirements of this paragraph shall not apply to wind
      generators.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|5.4 | Equipment Procurement.If responsibility for
      construction of Transmission Provider's Interconnection Facilities or
      Network Upgrades is to be borne by Transmission Provider, then
      Transmission Provider shall commence design of Transmission Provider's
      Interconnection Facilities or Network Upgrades and procure necessary
      equipment as soon as practicable after all of the following conditions are
      satisfied, unless the Parties otherwise agree in
writing:                                                                                                                                                                                                                                                                                                                                                       

| | 5.4.1. | Transmission Provider has completed the Facilities Study
      pursuant to the Facilities Study Agreement;                                                                                    
| | ------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |        |                                                                                                                                                                                               
| | 5.4.2  | Transmission Provider has received written authorization
      to proceed with design and procurement from Interconnection Customer by
      the date specified in Appendix B, Milestones; and
| |        |                                                                                                                                                                                               
| | 5.4.3  | Interconnection Customer has provided security to
      Transmission Provider in accordance with Article 11.5 by the dates
      specified in Appendix B, Milestones.                         

|5.5 | Construction Commencement.Transmission Provider
      shall commence construction of Transmission Provider's Interconnection
      Facilities and Network Upgrades for which it is responsible as soon as
      practicable after the following additional conditions are
  satisfied:
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 5.5.1 | Approval of the appropriate Governmental Authority has
      been obtained for any facilities requiring regulatory approval;                                                                                                       
| | ----- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |       |                                                                                                                                                                                                                                    
| | 5.5.2 | Necessary real property rights and rights-of-way have
      been obtained, to the extent required for the construction of a discrete
      aspect of Transmission Provider's Interconnection Facilities and Network
      Upgrades;
| |       |                                                                                                                                                                                                                                    
| | 5.5.3 | Transmission Provider has received written authorization
      to proceed with construction from Interconnection Customer by the date
      specified in Appendix B, Milestones; and                                               
| |       |                                                                                                                                                                                                                                    
| | 5.5.4 | Interconnection Customer has provided security to
      Transmission Provider in accordance with Article 11.5 by the dates
      specified in Appendix B, Milestones.                                                              

|Issued by: Mario Villar | 18 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|5.6 | Work Progress.The Parties will keep each other
      advised periodically as to the progress of their respective design,
      procurement and construction efforts. Either Party may, at any time,
      request a progress report from the other Party. If, at any time,
      Interconnection Customer determines that the completion of Transmission
      Provider's Interconnection Facilities will not be required until after the
      specified In-Service Date, Interconnection Customer will provide written
      notice to Transmission Provider of such later date upon which the
      completion of Transmission Provider's Interconnection Facilities will be
      required.                                                                                                                                                                                                                                                                                                                               
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|5.7 | Information Exchange.As soon as reasonably
      practicable after the Effective Date, the Parties shall exchange
      information regarding the design and compatibility of the Parties'
      Interconnection Facilities and compatibility of the Interconnection
      Facilities with Transmission Provider's Transmission System, and shall
      work diligently and in good faith to make any necessary design
    changes.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|5.8 | Limited Operation.If any of Transmission
      Provider's Interconnection Facilities or Network Upgrades are not
      reasonably expected to be completed prior to the Commercial Operation Date
      of the Large Generating Facility, Transmission Provider shall, upon the
      request and at the expense of Interconnection Customer, perform operating
      studies on a timely basis to determine the extent to which the Large
      Generating Facility and Interconnection Customer's Interconnection
      Facilities may operate prior to the completion of Transmission Provider's
      Interconnection Facilities or Network Upgrades consistent with Applicable
      Laws and Regulations, Applicable Reliability Standards, Good Utility
      Practice, and this LGIA. Transmission Provider shall permit
      Interconnection Customer to operate the Large Generating Facility and
      Interconnection Customer's Interconnection Facilities in accordance with
      the results of such studies.
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|5.9 | Interconnection Customer's Interconnection Facilities
      ("ICIF").                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|    | Interconnection Customer shall, at its expense, design,
      procure, construct, own and install the ICIF, as set forth in Appendix A,
      Interconnection Facilities, Network Upgrades and Distribution
    Upgrades.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

| | 5.9.1 | Interconnection Customer's Interconnection Facility
      Specifications.Interconnection Customer shall submit initial
      specifications for the ICIF, including System Protection Facilities, to
      Transmission Provider at least one hundred eighty (180) Calendar Days
      prior to the Initial Synchronization Date;and final specifications for
      review and comment at least ninety(90) Calendar Days prior to the Initial
      Synchronization Date. Transmission Provider shall review such
      specifications to ensure that the ICIF are compatible with the technical
      specifications, operational control, and safety requirements of
      Transmission Provider and comment on such specifications within thirty
      (30) Calendar Days of Interconnection Customer's submission. All
      specifications provided hereunder shall be deemed confidential.
| | ----- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
|
|
|
| |       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
| | 5.9.2 | Transmission Provider's Review.Transmission
      Provider's review of Interconnection Customer's final specifications shall
      not be construed as confirming, endorsing, or providing a warranty as to
      the design, fitness, safety, durability or reliability of the Large
      Generating Facility, or the ICIF.
Interconnection                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

|Issued by: Mario Villar | 19 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |    |                     
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Customer shall make such changes to
the ICIF as may reasonably be required by Transmission Provider, in accordance
with Good Utility Practice, to ensure that the ICIF are compatible with the
technical specifications, operational control, and safety requirements of
Transmission Provider.

| | 5.9.3 | ICIF Construction.The ICIF shall be designed and
      constructed in accordance with Good Utility Practice. Within one hundred
      twenty (120) Calendar Days after the Commercial Operation Date, unless the
      Parties agree on another mutually acceptable deadline, Interconnection
      Customer shall deliver to Transmission Provider "as-built" drawings,
      information and documents for the ICIF, such as: a one-line diagram, a
      site plan showing the Large Generating Facility and the ICIF, plan and
      elevation drawings showing the layout of the ICIF, a relay functional
      diagram, relaying AC and DC schematic wiring diagrams and relay settings
      for all facilities associated with Interconnection Customer's step-up
      transformers, the facilities connecting the Large Generating Facility to
      the step-up transformers and the ICIF, and the impedances (determined by
      factory tests) for the associated step-up transformers and the Large
      Generating Facility. The Interconnection Customer shall provide
      Transmission Provider specifications for the excitation system, automatic
      voltage regulator, Large Generating Facility control and protection
      settings, transformer tap settings, and communications, if
    applicable.
| | ----- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|**5.10** | Transmission Provider's Interconnection
      Facilities Construction. Transmission Provider's Interconnection
      Facilities shall be designed and constructed in accordance with Good
      Utility Practice. Upon request, within one hundred twenty {120) Calendar
      Days after the Commercial Operation Date, unless the Parties agree on
      another mutually acceptable deadline, Transmission Provider shall deliver
      to Interconnection Customer the following "as-built" drawings, information
      and documents for Transmission Provider's Interconnection Facilities
      [include appropriate drawings and relay diagrams].Transmission Provider
      will obtain control of Transmission Provider's Interconnection Facilities
      and Stand Alone Network Upgrades upon completion of such facilities.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|-------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|**5.11** | Access Rights.Upon reasonable notice
      and supervision by a Party, and subject to any required or necessary
      regulatory approvals, a Party ("Granting Party") shall furnish _at no
      costto the other Party ("Access Party") any rights of use, licenses,
      rights of way and easements with respect to lands owned or controlled by
      the Granting Party, its agents (if allowed under the applicable agency
      agreement), or any Affiliate, that are necessary to enable the Access
      Party to obtain ingress and egress to construct, operate, maintain,
      repair, test (or witness testing), inspect, replace or remove facilities
      and equipment to: (i) interconnect the Large Generating Facility with the
      Transmission System; (ii) operate and maintain the Large Generating
      Facility, the Interconnection Facilities and the Transmission System; and
      (iii) disconnect or remove the Access Party's facilities and equipment
      upon termination of this LGIA. In exercising such licenses, rights of way
      and easements, the Access Party shall not unreasonably disrupt or
      interfere with normal operation of the Granting Party's business and shall
      adhere to the safety rules and procedures established in advance, as may
      be changed from time to time, by the Granting Party and provided to the
      Access Party.

|Issued by: Mario Villar | 20 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|5.12 | Lands of Other Property Owners.If any part of
      Transmission Provider or Transmission Owner's Interconnection Facilities
      and/or Network Upgrades is to be installed on property owned by persons
      other than Interconnection Customer or Transmission Provider or
      Transmission Owner, Transmission Provider or Transmission Owner shall at
      Interconnection Customer's expense use efforts, similar in nature and
      extent to those that it typically undertakes on its own behalf or on
      behalf of its Affiliates, including use of its eminent domain authority,
      and to the extent consistent with state law, to procure from such persons
      any rights of use, licenses, rights of way and easements that are
      necessary to construct, operate, maintain, test, inspect, replace or
      remove Transmission Provider or Transmission Owner's Interconnection
      Facilities and/or Network Upgrades upon such property.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|---- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|5.13 | Permits. Transmission Provider or Transmission Owner and
      Interconnection Customer shall cooperate with each other in good faith in
      obtaining all permits, licenses and authorizations that are necessary to
      accomplish the interconnection in compliance with Applicable Laws and
      Regulations. With respect to this paragraph, Transmission Provider or
      Transmission Owner shall provide permitting assistance to Interconnection
      Customer comparable to that provided to Transmission Provider's own, or an
      Affiliate's generation.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|5.14 | Early Construction of Base Case Facilities.Interconnection Customer may request Transmission Provider to
      construct, and Transmission Provider shall construct, using Reasonable
      Efforts to accommodate Interconnection Customer's In-Service Date, all or
      any portion of any Network Upgrades required for Interconnection Customer
      to be interconnected to the Transmission System which are included in the
      Base Case of the Facilities Study for Interconnection Customer, and which
      also are required to be constructed for another Interconnection Customer,
      but where such construction is not scheduled to be completed in time to
      achieve Interconnection Customer's In-Service Date.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|5.15 | Suspension.Interconnection Customer reserves the
      right, upon written notice to Transmission Provider, to suspend at any
      time all work by Transmission Provider associated with the construction
      and installation of Transmission Provider's Interconnection Facilities
      and/or Network Upgrades required under this LGIA with the condition that
      Transmission System shall be left in a safe and reliable condition in
      accordance with Good Utility Practice and Transmission Provider's safety
      and reliability criteria. In such event, Interconnection Customer shall be
      responsible for all reasonable and necessary costs which Transmission
      Provider (i) has incurred pursuant to this LGIA prior to the suspension
      and (ii) incurs in suspending such work, including any costs incurred to
      perform such work as may be necessary to ensure the safety of persons and
      property and the integrity of the Transmission System during such
      suspension and, if applicable, any costs incurred in connection with the
      cancellation or suspension of material, equipment and labor contracts
      which Transmission Provider cannot reasonably avoid; provided, however,
      that prior to canceling or suspending any such material, equipment or
      labor contract, Transmission Provider shall obtain Interconnection
      Customer's authorization to do so. Transmission Provider shall invoice
      Interconnection Customer for such costs pursuant to Article 12 and shall
      use due diligence to minimize its costs. In the event Interconnection
      Customer suspends work by Transmission Provider required under this LGIA
      pursuant to this Article 5.16, and has not requested
  Transmission

|Issued by: Mario Villar | 21 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources OperatingCompanies |                              
|------------------------------------------- | -----------------------------
|FERC Electric Tariff                        | Service Agreement No.07-01534
|Third Revised Volume No. 1                  |                              
|Open Access Transmission Tariff             |                              

Provider to recommence the work required under this LGIA on or
before the expiration of three (3) years following commencement of such
suspension, this LGIA shall be deemed terminated. The three-year period shall
begin on the date the suspension is requested, or the date of the written notice
to Transmission Provider, if no effective date is specified.

5.16 Taxes.

| | 5.16.1 | Interconnection Customer Payments Not Taxable.The
      Parties intend that all payments or property transfers made by
      Interconnection Customer to Transmission Provider for the installation of
      Transmission Provider's Interconnection Facilities and the Network
      Upgrades shall be non-taxable, either as contributions to capital, or as
      an advance, in accordance with the Internal Revenue Code and any
      applicable state income tax laws and shall not be taxable as contributions
      in aid of construction or otherwise under the Internal Revenue Code and
      any applicable state income tax laws.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
| | ------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
| | 5.16.2 | Representations andCovenants.In
      accordance with IRS Notice 2001-82 and IRS Notice 88-129, Interconnection
      Customer represents and covenants that (i) ownership of the electricity
      generated at the Large Generating Facility will pass to another party
      prior to the transmission of the electricity on the Transmission System,
      (ii) for income tax purposes, the amount of any payments and the cost of
      any property transferred to Transmission Provider for Transmission
      Provider's Interconnection Facilities will be capitalized by
      Interconnection Customer as an intangible asset and recovered using the
      straight-line method over a useful life of twenty (20) years, and (iii)
      any portion of Transmission Provider's Interconnection Facilities that is
      a "dual-use intertie," within the meaning of IRS Notice 88-129, is
      reasonably expected to carry only a de minimis amount of electricity in
      the direction of the Large Generating Facility. For this purpose, "de
      minimis amount" means no more than 5 percent of the total power flows in
      both directions, calculated in accordance with the "5 percent test" set
      forth in IRS Notice 88-129. This is not intended to be an exclusive list
      of the relevant conditions that must be met to conform to IRS requirements
      for non-taxable treatment.
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
| |        | At Transmission Provider's request, Interconnection
      Customer shall provide Transmission Provider with a report from an
      independent engineer confirming its representation in clause (iii), above.
      Transmission Provider represents and covenants that the cost of
      Transmission Provider's Interconnection Facilities paid for by
      Interconnection Customer will have no net effect on the base upon which
      rates are determined.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              

|Issued by: Mario Villar | 22 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                               
|-------------------------------------------- | ------------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534_
|Third Revised Volume No. 1                   |                               
|Open Access Transmission Tariff              |                               

| | 5.16.3 | Indemnification for the Cost Consequences of Current
      Tax Liability Imposed Upon the Transmission
      Provider.Notwithstanding Article 5.16.1, Interconnection Customer
      shall protect, indemnify and hold harmless Transmission Provider from the
      cost consequences of any current tax liability imposed against
      Transmission Provider as the result of payments or property transfers made
      by Interconnection Customer to Transmission Provider under this LGIA for
      Interconnection Facilities, as well as any interest and penalties, other
      than interest and penalties attributable to any delay caused by
      Transmission Provider.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
| | ------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
| |        | Transmission Provider shall not include a gross-up for
      the cost consequences of any current tax liability in the amounts it
      charges Interconnection Customer under this LGIA unless (i) Transmission
      Provider has determined, in good faith, that the payments or property
      transfers made by Interconnection Customer to Transmission Provider should
      be reported as income subject to taxation or (ii) any Governmental
      Authority directs Transmission Provider to report payments or property as
      income subject to taxation; provided, however,that Transmission
      Provider may require Interconnection Customer to provide security for
      Interconnection Facilities, in a form reasonably acceptable to
      Transmission Provider (such as a parental guarantee or a letter of
      credit), in an amount equal to the cost consequences of any current tax
      liability under this Article 5.16. Interconnection Customer shall
      reimburse Transmission Provider for such costs on a fully grossed-up
      basis, in accordance with Article 5.16.4, within thirty (30) Calendar Days
      of receiving written notification from Transmission Provider of the amount
      due, including detail about how the amount was calculated.
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
| |        | The indemnification obligation shall terminate at the
      earlier of (1) the expiration of the ten year testing period and the
      applicable statute of limitation, as it may be extended by Transmission
      Provider upon request of the IRS, to keep these years open for audit or
      adjustment, or (2) the occurrence of a subsequent taxable event and the
      payment of any related indemnification obligations as contemplated by this
      Article 5.16.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
| | 5.16.4 | Tax Gross-Up Amount.Interconnection Customer's
      liability for the cost consequences of any current tax liability under
      this Article 5.16 shall be calculated on a fully grossed-up basis. Except
      as may otherwise be agreed to by the parties, this means that
      Interconnection Customer will pay Transmission Provider, in addition to
      the amount paid for the Interconnection Facilities and Network Upgrades,
      an amount equal to (1) the current taxes imposed on Transmission Provider
      ("Current Taxes") on the excess of (a) the gross income realized by
      Transmission Provider as a result of payments or property transfers made
      by Interconnection Customer to Transmission Provider under this LGIA
      (without regard to any payments under                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              

|Issued by: Mario Villar | 23 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                               
|-------------------------------------------- | ------------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534_
|Third Revised Volume No. 1                   |                               
|Open Access Transmission Tariff              |                               

this Article 5.16) (the "Gross Income
Amount") over (b) the present value of future tax deductions for depreciation
that will be available as a result of such payments or property transfers (the
"Present Value Depreciation Amount"), plus (2) an additional amount sufficient
to permit Transmission Provider to receive and retain, after the payment of all
Current Taxes, an amount equal to the net amount described in clause (1).

For this purpose, (i) Current Taxes
shall be computed based on Transmission Provider's composite federal and state
tax rates at the time the payments or property transfers are received and
Transmission Provider will be treated as being subject to tax at the highest
marginal rates in effect at that time (the "Current Tax Rate"), and (ii) the
Present Value Depreciation Amount shall be computed by discounting Transmission
Provider's anticipated tax depreciation deductions as a result of such payments
or property transfers by Transmission Provider's current weighted average cost
of capital. Thus, the formula for calculating Interconnection Customer's
liability to Transmission Owner pursuant to this Article 5.16.4 can be expressed
as follows: (Current Tax Rate x (Gross Income Amount - Present Value of Tax
Depreciation))/(1-Current Tax Rate). Interconnection Customer's estimated tax
liability in the event taxes are imposed shall be stated in Appendix A,
Interconnection Facilities, Network Upgrades and Distribution Upgrades.

| | 5.16.5 | Private Letter Ruling or Change or Clarification of
      Law.At Interconnection Customer's request and expense, Transmission
      Provider shall file with the IRS a request for a private letter ruling as
      to whether any property transferred or sums paid, or to be paid, by
      Interconnection Customer to Transmission Provider under this LGIA are
      subject to federal income taxation. Interconnection Customer will prepare
      the initial draft of the request for a private letter ruling, and will
      certify under penalties of perjury that all facts represented in such
      request are true and accurate to the best of Interconnection Customer's
      knowledge. Transmission Provider and Interconnection Customer shall
      cooperate in good faith with respect to the submission of such
    request.
| | ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
| |        | Transmission Provider shall keep Interconnection Customer
      fully informed of the status of such request for a private letter ruling
      and shall execute either a privacy act waiver or a limited power of
      attorney, in a form acceptable to the IRS, that authorizes Interconnection
      Customer to participate in all discussions with the IRS regarding such
      request for a private letter ruling. Transmission Provider shall allow
      Interconnection Customer to attend all meetings with IRS officials about
      the request and shall permit Interconnection Customer to prepare the
      initial drafts of any follow-up letters in connection with the
    request.                                                                                                                                             

|Issued by: Mario Villar | 24 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                               
|-------------------------------------------- | ------------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534_
|Third Revised Volume No. 1                   |                               
|Open Access Transmission Tariff              |                               

| | 5.16.6 | Subsequent Taxable Events.If, within 10 years
      from the date on which the relevant Transmission Provider's
      Interconnection Facilities are placed in service, (i) Interconnection
      Customer Breaches the covenants contained in Article 5.16.2, (ii) a
      "disqualification event" occurs within the meaning of IRS Notice 88-129,
      or (iii) this LGIA terminates and Transmission Provider retains ownership
      of the Interconnection Facilities and Network Upgrades, Interconnection
      Customer shall pay a tax gross-up for the cost consequences of any current
      tax liability imposed on Transmission Provider, calculated using the
      methodology described in Article 5.16.4 and in accordance with IRS Notice
      90-60.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
| | ------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
| | 5.16.7 | Contests.In the event any Governmental Authority
      determines that Transmission Provider's receipt of payments or property
      constitutes income that is subject to taxation, Transmission Provider
      shall notify Interconnection Customer, in writing, within thirty (30)
      Calendar Days of receiving notification of such determination by a
      Governmental Authority. Upon the timely written request by Interconnection
      Customer and at Interconnection Customer's sole expense, Transmission
      Provider may appeal, protest, seek abatement of, or otherwise oppose such
      determination. Upon Interconnection Customer's written request and sole
      expense, Transmission Provider may file a claim for refund with respect to
      any taxes paid under this Article 5.16, whether or not it has received
      such a determination. Transmission Provider reserves the right to make all
      decisions with regard to the prosecution of such appeal, protest,
      abatement or other contest, including the selection of counsel and
      compromise or settlement of the claim, but Transmission Provider shall
      keep Interconnection Customer informed, shall consider in good faith
      suggestions from Interconnection Customer about the conduct of the
      contest, and shall reasonably permit Interconnection Customer or an
      Interconnection Customer representative to attend contest
    proceedings.
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
| |        | Interconnection Customer shall pay to Transmission
      Provider on a periodic basis, as invoiced by Transmission Provider,
      Transmission Provider's documented reasonable costs of prosecuting such
      appeal, protest, abatement or other contest. At any time during the
      contest, Transmission Provider may agree to a settlement either with
      Interconnection Customer's consent or after obtaining written advice from
      nationally-recognized tax counsel, selected by Transmission Provider, but
      reasonably acceptable to Interconnection Customer, that the proposed
      settlement represents a reasonable settlement given the hazards of
      litigation. Interconnection Customer's obligation shall be based on the
      amount of the settlement agreed to by Interconnection Customer, or if a
      higher amount, so much of the settlement that is supported by the written
      advice from nationally-recognized tax counsel selected under the terms of
      the preceding sentence. The settlement amount shall be calculated on a
      fully grossed-up basis to cover any related cost consequences of the
      current tax liability. Any settlement                                                                                                                                                                                                                                                                   

|Issued by: Mario Villar | 25 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                               
|-------------------------------------------- | ------------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534_
|Third Revised Volume No. 1                   |                               
|Open Access Transmission Tariff              |                               

without Interconnection Customer's
consent or such written advice will relieve Interconnection Customer from any
obligation to indemnify Transmission Provider for the tax at issue in the
contest.

| | 5.16.8 | Refund.In the event that (a) a private letter
      ruling is issued to Transmission Provider which holds that any amount paid
      or the value of any property transferred by Interconnection Customer to
      Transmission Provider under the terms of this LGIA is not subject to
      federal income taxation, (b) any legislative change or administrative
      announcement, notice, ruling or other determination makes it reasonably
      clear to Transmission Provider in good faith that any amount paid or the
      value of any property transferred by Interconnection Customer to
      Transmission Provider under the terms of this LGIA is not taxable to
      Transmission Provider, (c) any abatement, appeal, protest, or other
      contest results in a determination that any payments or transfers made by
      Interconnection Customer to Transmission Provider are not subject to
      federal income tax, or (d) if Transmission Provider receives a refund from
      any taxing authority for any overpayment of tax attributable to any
      payment or property transfer made by Interconnection Customer to
      Transmission Provider pursuant to this LGIA, Transmission Provider shall
      promptly refund to Interconnection Customer the
  following:
| | ------ | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

(i) any payment made by
Interconnection Customer under this Article 5.16 for taxes that is attributable
to the amount determined to be non-taxable,

(ii) with respect to any such taxes
paid by Transmission Provider, any refund or credit Transmission Provider
receives or to which it may be entitled from any Governmental Authority,
interest (or that portion thereof attributable to the payment described in
clause (i), above) owed to Transmission Provider for such overpayment of taxes
(including any reduction in interest otherwise payable by Transmission Provider
to any Governmental Authority resulting from an offset or credit); provided,
however,that Transmission Provider will remit such amount promptly to
Interconnection Customer only after and to the extent that Transmission Provider
has received a tax refund, credit or offset from any Governmental Authority for
any applicable overpayment of income tax related to Transmission Provider's
Interconnection Facilities.

The intent of this provision is to
leave the Parties, to the extent practicable, in the event that no taxes are due
with respect to any payment for Interconnection Facilities and Network Upgrades
hereunder, in the same position they would have been in had no such tax payments
been made.

|Issued by: Mario Villar | 26 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                               
|-------------------------------------------- | ------------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534_
|Third Revised Volume No. 1                   |                               
|Open Access Transmission Tariff              |                               

| | 5.16.9  | Taxes Other Than Income Taxes.Upon the timely
      request by Interconnection Customer, and at Interconnection Customer's
      sole expense, Transmission Provider may appeal, protest, seek abatement
      of, or otherwise contest any tax (other than federal or state income tax)
      asserted or assessed against Transmission Provider for which
      Interconnection Customer may be required to reimburse Transmission
      Provider under the terms of this LGIA. Interconnection Customer shall pay
      to Transmission Provider on a periodic basis, as invoiced by Transmission
      Provider, Transmission Provider's documented reasonable costs of
      prosecuting such appeal, protest, abatement, or other contest.
      Interconnection Customer and Transmission Provider shall cooperate in good
      faith with respect to any such contest. Unless the payment of such taxes
      is a prerequisite to an appeal or abatement or cannot be deferred, no
      amount shall be payable by Interconnection Customer to Transmission
      Provider for such taxes until they are assessed by a final, non-appealable
      order by any court or agency of competent jurisdiction. In the event that
      a tax payment is withheld and ultimately due and payable after appeal,
      Interconnection Customer will be responsible for all taxes, interest and
      penalties, other than penalties attributable to any delay caused by
      Transmission Provider.
| | ------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
| | 5.16.10 | Transmission Owners Who Are Not Transmission
      Providers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
| |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
| |         | If transmission Provider is not the same entity as the
      Transmission Owner, then (i) all references in this Article 5.16 to
      Transmission Provider shall be deemed also to refer to and to include the
      Transmission Owner, as appropriate, and (ii) this LGIA shall not become
      effective until such Transmission Owner shall have agreed in writing to
      assume all of the duties and obligations of Transmission Provider under
    this Article 5.16 of this LGIA.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            

|5.17 | Tax Status.Each Party shall cooperate with the
      other to maintain the other Party's tax status. Nothing in this LGIA is
      intended to adversely affect any Transmission Provider's tax exempt status
      with respect to the issuance of bonds including, but not limited to, Local
      Furnishing Bonds.
|---- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

5.18 Modification.

| | 5.18.1 | General.Either Party may undertake modifications
      to its facilities. If a Party plans to undertake a modification that
      reasonably may be expected to affect the other Party's facilities, that
      Party shall provide to the other Party sufficient information regarding
      such modification so that the other Party may evaluate the potential
      impact of such modification prior to commencement of the work. Such
      information shall be deemed to be confidential hereunder and shall include
      information concerning the timing of such modifications and whether such
      modifications are expected to interrupt the flow of electricity from the
      Large Generating Facility. The Party desiring to perform such work shall
      provide the relevant drawings, plans, and specifications to the other
      Party at least ninety (90) Calendar Days in advance of the commencement of
      the work or such shorter period upon which the Parties may agree, which
      agreement shall not unreasonably be withheld, conditioned or
    delayed.
| | ------ | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Issued by: Mario Villar | 27 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |    |                     
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                               
|-------------------------------------------- | ------------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534_
|Third Revised Volume No. 1                   |                               
|Open Access Transmission Tariff              |                               

In the case of Large Generating
Facility modifications that do not require Interconnection Customer to submit an
Interconnection Request, Transmission Provider shall provide, within thirty (30}
Calendar Days (or such other time as the Parties may agree}, an estimate of any
additional modifications to the Transmission System, Transmission Provider's
Interconnection Facilities or Network Upgrades necessitated by such
Interconnection Customer modification and a good faith estimate of the costs
thereof.

| | 5.18.2 | Standards.Any additions, modifications, or
      replacements made to a Party's facilities shall be designed, constructed
      and operated in accordance with this LGIA, Applicable Reliability
      Standards and Good Utility Practice.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
| | ------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
| | 5.18.3 | Modification Costs. Interconnection Customer shall
      not be directly assigned for the costs of any additions, modifications, or
      replacements that Transmission Provider makes to Transmission Provider's
      Interconnection Facilities or the Transmission System to facilitate the
      interconnection of a third party to Transmission Provider's
      Interconnection Facilities or the Transmission System, or to provide
      transmission service to a third party under Transmission Provider's
      Tariff. Interconnection Customer shall be responsible for the costs of any
      additions, modifications, or replacements to Interconnection Customer's
      Interconnection Facilities that may be necessary to maintain or upgrade
      such Interconnection Customer's Interconnection Facilities consistent with
      Applicable Laws and Regulations, Applicable Reliability Standards or Good
      Utility Practice.

Article 6. Testing and Inspection

|6.1 | Pre-Commercial Operation Date Testing and
      Modifications.Prior to the Commercial Operation Date, Transmission
      Provider shall test Transmission Provider's Interconnection Facilities and
      Network Upgrades and Interconnection Customer shall test the Large
      Generating Facility and Interconnection Customer's Interconnection
      Facilities to ensure their safe and reliable operation. Similar testing
      may be required after initial operation. Each Party shall make any
      modifications to its facilities that are found to be necessary as a result
      of such testing. Interconnection Customer shall bear the cost of all such
      testing and modifications. Interconnection Customer shall generate test
      energy at the Large Generating Facility only if it has arranged for the
      delivery of such test energy.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|6.2 | Post-Commercial Operation Date Testing and
      Modifications.Each Party shall at its own expense perform routine
      inspection and testing of its facilities and equipment in accordance with
      Good Utility Practice as may be necessary to ensure the continued
      interconnection of the Large Generating Facility with the Transmission
      System in a safe and reliable manner. Each Party shall have the right,
      upon advance written notice, to require reasonable additional testing of
      the other Party's facilities, at the requesting Party's expense, as may be
      in accordance with Good Utility Practice.                                                                                                                                                                                                                         

|Issued by: Mario Villar | 28 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|6.3 | Right to Observe Testing.Each Party shall notify
      the other Party in advance of its performance of tests of its
      Interconnection Facilities. The other Party has the right, at its own
      expense, to observe such testing.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|6.4 | Right to Inspect.Each Party shall have the
      right, but shall have no obligation to: (i) observe the other Party's
      tests and/or inspection of any of its System Protection Facilities and
      other protective equipment, including Power System Stabilizers; (ii)
      review the settings of the other Party's System Protection Facilities and
      other protective equipment; and (iii) review the other Party's maintenance
      records relative to the Interconnection Facilities, the System Protection
      Facilities and other protective equipment. A Party may exercise these
      rights from time to time as it deems necessary upon reasonable notice to
      the other Party. The exercise or non-exercise by a Party of any such
      rights shall not be construed as an endorsement or confirmation of any
      element or condition of the Interconnection Facilities or the System
      Protection Facilities or other protective equipment or the operation
      thereof, or as a warranty as to the fitness, safety, desirability, or
      reliability of same. Any information that a Party obtains through the
      exercise of any of its rights under this Article 6.4 shall be deemed to be
      Confidential Information and treated pursuant to Article 22 of this
      LGIA.

Article 7. Metering

|7.1 | General.Each Party shall comply with the
      Applicable Reliability Council requirements. Unless otherwise agreed by
      the Parties, Transmission Provider shall install Metering Equipment at the
      Point of Interconnection prior to any operation of the Large Generating
      Facility and shall own, operate, test and maintain such Metering
      Equipment. Power flows to and from the Large Generating Facility shall be
      measured at or, at Transmission Provider's option, compensated to, the
      Point of Interconnection. Transmission Provider shall provide metering
      quantities, in analog and/or digital form, to Interconnection Customer
      upon request. Interconnection Customer shall bear all reasonable
      documented costs associated with the purchase, installation, operation,
      testing and maintenance of the Metering Equipment.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|7.2 | Check Meters.Interconnection Customer, at its
      option and expense, may install and operate, on its premises and on its
      side of the Point of Interconnection, one or more check meters to check
      Transmission Provider's meters. Such check meters shall be for check
      purposes only and shall not be used for the measurement of power flows for
      purposes of this LGIA, except as provided in Article 7.4 below. The check
      meters shall be subject at all reasonable times to inspection and
      examination by Transmission Provider or its designee. The installation,
      operation and maintenance thereof shall be performed entirely by
      Interconnection Customer in accordance with Good Utility
  Practice.                                                                                                                                    
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|7.3 | Standards.Transmission Provider shall install,
      calibrate, and test revenue quality Metering Equipment in accordance with
      applicable ANSI standards.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

|Issued by: Mario Villar | 29 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|7.4 | Testing of Metering Equipment.Transmission
      Provider shall inspect and test all Transmission Provider-owned Metering
      Equipment upon installation and at least once every two (2) years
      thereafter. If requested to do so by Interconnection Customer,
      Transmission Provider shall, at Interconnection Customer's expense,
      inspect or test Metering Equipment more frequently than every two (2)
      years. Transmission Provider shall give reasonable notice of the time when
      any inspection or test shall take place, and Interconnection Customer may
      have representatives present at the test or inspection. If at any time
      Metering Equipment is found to be inaccurate or defective, it shall be
      adjusted, repaired or replaced at Interconnection Customer's expense, in
      order to provide accurate metering, unless the inaccuracy or defect is due
      to Transmission Provider's failure to maintain, then Transmission Provider
      shall pay. If Metering Equipment fails to register, or if the measurement
      made by Metering Equipment during a test varies by more than two percent
      from the measurement made by the standard meter used in the test,
      Transmission Provider shall adjust the measurements by correcting all
      measurements for the period during which Metering Equipment was in error
      by using Interconnection Customer's check meters, if installed. If no such
      check meters are installed or if the period cannot be reasonably
      ascertained, the adjustment shall be for the period immediately preceding
      the test of the Metering Equipment equal to one half the time from the
      date of the last previous test of the Metering Equipment.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|7.5 | Metering Data.At Interconnection Customer's
      expense, the metered data shall be telemetered to one or more locations
      designated by Transmission Provider and one or more locations designated
      by Interconnection Customer. Such telemetered data shall be used, under
      normal operating conditions, as the official measurement of the amount of
      energy delivered from the Large Generating Facility to the Point of
      Interconnection.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

Article 8. Communications

|8.1 | Interconnection Customer Obligations.Interconnection Customer shall maintain satisfactory operating
      communications with Transmission Provider's Transmission System dispatcher
      or representative designated by Transmission Provider. Interconnection
      Customer shall provide standard voice line, dedicated voice line and
      facsimile communications at its Large Generating Facility control room or
      central dispatch facility through use of either the public telephone
      system, or a voice communications system that does not rely on the public
      telephone system. Interconnection Customer shall also provide the
      dedicated data circuit(s) necessary to provide Interconnection Customer
      data to Transmission Provider as set forth in Appendix D, Security
      Arrangements Details. The data circuit(s) shall extend from the Large
      Generating Facility to the location(s) specified by Transmission Provider.
      Any required maintenance of such communications equipment shall be
      performed by Interconnection Customer. Operational communications shall be
      activated and maintained under, but not be limited to, the following
      events: system paralleling or separation, scheduled and unscheduled
      shutdowns, equipment clearances, and hourly and daily load
  data.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Issued by: Mario Villar | 30 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No.1                    |                              
|Open Access TransmissionTariff               |                              

|8.2 | Remote Terminal Unit. Prior to the Initial
      Synchronization Date of the Large Generating Facility, a Remote Terminal
      Unit, or equivalent data collection and transfer equipment acceptable to
      the Parties, shall be installed by Interconnection Customer, or by
      Transmission Provider at Interconnection Customer's expense, to gather
      accumulated and instantaneous data to be telemetered to the location(s)
      designated by Transmission Provider through use of a dedicated
      point-to-point data circuit(s) as indicated in Article 8.1. The
      communication protocol for the data circuit(s) shall be specified by
      Transmission Provider. Instantaneous bi-directional analog real power and
      reactive power flow information must be telemetered directly to the
      location(s) specified by Transmission Provider.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|    | Each Party will promptly advise the other Party if it
      detects or otherwise learns of any metering, telemetry or communications
      equipment errors or malfunctions that require the attention and/or
      correction by the other Party. The Party owning such equipment shall
      correct such error or malfunction as soon as reasonably
feasible.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|8.3 | No Annexation.Any and all equipment placed on the
      premises of a Party shall be and remain the property of the Party
      providing such equipment regardless of the mode and manner of annexation
      or attachment to real property, unless otherwise mutually agreed by the
      Parties.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             

Article 9. Operations

|9.1 | General.Each Party shall comply with the
      Applicable Reliability Council requirements. Each Party shall provide to
      the other Party all information that may reasonably be required by the
      other Party to comply with Applicable Laws and Regulations and Applicable
      Reliability Standards.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|9.2 | Control Area Notification.At least three months
      before Initial Synchronization Date, Interconnection Customer shall notify
      Transmission Provider in writing of the Control Area in which the Large
      Generating Facility will be located. If Interconnection Customer elects to
      locate the Large Generating Facility in a Control Area other than the
      Control Area in which the Large Generating Facility is physically located,
      and if permitted to do so by the relevant transmission tariffs, all
      necessary arrangements, including but not limited to those set forth in
      Article 7 and Article 8 of this LGIA, and remote Control Area generator
      interchange agreements, if applicable, and the appropriate measures under
      such agreements, shall be executed and implemented prior to the placement
      of the Large Generating Facility in the other Control Area.
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|9.3 | Transmission Provider Obligations.Transmission
      Provider shall cause the Transmission System and Transmission Provider's
      Interconnection Facilities to be operated, maintained and controlled in a
      safe and reliable manner and in accordance with this LGIA. Transmission
      Provider may provide operating instructions to Interconnection Customer
      consistent with this LGIA and Transmission Provider's operating protocols
      and procedures as they may change from time to time. Transmission Provider
      will consider changes to its operating protocols and procedures proposed
      by Interconnection Customer.                                                                                                                                                                                                                                                                        

|Issued by: Mario Villar | 31 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|9.4 | Interconnection Customer Obligations.Interconnection Customer shall at its own expense operate, maintain
      and control the Large Generating Facility and Interconnection Customer's
      Interconnection Facilities in a safe and reliable manner and in accordance
      with this LGIA. Interconnection Customer shall operate the Large
      Generating Facility and Interconnection Customer's Interconnection
      Facilities in accordance with all applicable requirements of the Control
      Area of which it is part, as such requirements are set forth in Appendix
      C, Interconnection Details, of this LGIA. Appendix C, Interconnection
      Details, will be modified to reflect changes to the requirements as they
      may change from time to time. Either Party may request that the other
      Party provide copies of the requirements set forth in Appendix C,
      Interconnection Details, of this LGIA.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|9.5 | Start-Up and Synchronization.Consistent with the
      Parties' mutually acceptable procedures, Interconnection Customer is
      responsible for the proper synchronization of the Large Generating
      Facility to Transmission Provider's Transmission System.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|9.6 | Reactive Power.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

| | 9.6.1 | Power Factor Design Criteria.Interconnection
      Customer shall design the Large Generating Facility to maintain a
      composite power delivery at continuous rated power output at the Point of
      Interconnection at a power factor within the range of 0.95 leading to 0.95
      lagging, unless Transmission Provider has established different
      requirements that apply to all generators in the Control Area on a
      comparable basis. The requirements of this paragraph shall not apply to
      wind generators.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
| | ----- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
| | 9.6.2 | Voltage Schedules.Once Interconnection Customer
      has synchronized the Large Generating Facility with the Transmission
      System, Transmission Provider shall require Interconnection Customer to
      operate the Large Generating Facility to produce or absorb reactive power
      within the design limitations of the Large Generating Facility set forth
      in Article 9.6.1 (Power Factor Design Criteria). Transmission Provider's
      voltage schedules shall treat all sources of reactive power in the Control
      Area in an equitable and not unduly discriminatory manner. Transmission
      Provider shall exercise Reasonable Efforts to provide Interconnection
      Customer with such schedules at least one (1) day in advance, and may make
      changes to such schedules as necessary to maintain the reliability of the
      Transmission System. Interconnection Customer shall operate the Large
      Generating Facility to maintain the specified output voltage or power
      factor at the Point of Interconnection within the design limitations of
      the Large Generating Facility set forth in Article 9.6.1 (Power Factor
      Design Criteria). If Interconnection Customer is unable to maintain the
      specified voltage or power factor, it shall promptly notify the System
      Operator.

| | 9.6.2.1 | Governors and Regulators.Whenever the Large
      Generating Facility is operated in parallel with the Transmission System
      and the speed governors (if installed on the generating unit pursuant to
      Good Utility Practice) and voltage regulators are
capable
| | ------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Issued by: Mario Villar | 32 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

of operation, Interconnection Customer
shall operate the Large Generating Facility with its speed governors and voltage
regulators in automatic operation. If the Large Generating Facility's speed
governors and voltage regulators are not capable of such automatic operation,
Interconnection Customer shall immediately notify Transmission Provider's system
operator, or its designated representative, and ensure that such Large
Generating Facility's reactive power production or absorption (measured in
MVARs) are within the design capability of the Large Generating Facility's
generating unit(s) and steady state stability limits. Interconnection Customer
shall not cause its Large Generating Facility to disconnect automatically or
instantaneously from the Transmission System or trip anygenerating unit
comprising the Large Generating Facility for an under or over frequency
condition unless the abnormal frequency condition persists for a time period
beyond the limits set forth in ANSI/IEEE Standard C37.106, or such other
standard as applied to other generators in the Control Area on a comparable
basis.

9.7 Outages and Interruptions.

| | 9.7.1 | Outages.
| | ----- | --------

| | 9.7.1.1 | Outage Authority and Coordination.Each Party may
      in accordance with Good Utility Practice in coordination with the other
      Party remove from service any of its respective Interconnection Facilities
      or Network Upgrades that may impact the other Party's facilities as
      necessary to perform maintenance or testing or to install or replace
      equipment. Absent an Emergency Condition, the Party scheduling a removal
      of such facility(ies) from service will use Reasonable Efforts to schedule
      such removal on a date and time mutually acceptable to the Parties. In all
      circumstances, any Party planning to remove such facility(ies) from
      service shall use Reasonable Efforts to minimize the effect on the other
      Party of such removal.
| | ------- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
| | 9.7.1.2 | Outage Schedules.Transmission Provider shall post
      scheduled outages of its transmission facilities on the OASIS.
      Interconnection Customer shall submit its planned maintenance schedules
      for the Large Generating Facility to Transmission Provider for a minimum
      of a rolling twenty-four month period. Interconnection Customer shall
      update its planned maintenance schedules as necessary. Transmission
      Provider may request Interconnection Customer to reschedule its
      maintenance as necessary to maintain                                                                                                                                                                                                                                                 

|Issued by: Mario Villar | 33 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

the reliability of the Transmission
System; provided, however, adequacy of generation supply shall not be a
criterion in determining Transmission System reliability.

| | 9.7.1.3 | Outage Restoration.If an outage on a Party's
      Interconnection Facilities or Network Upgrades adversely affects the other
      Party's operations or facilities, the Party that owns or controls the
      facility that is out of service shall use Reasonable Efforts to promptly
      restore such facility(ies) to a normal operating condition consistent with
      the nature of the outage. The Party that owns or controls the facility
      that is out of service shall provide the other Party, to the extent such
      information is known, information on the nature of the Emergency
      Condition, an estimated time of restoration, and any corrective actions
      required. Initial verbal notice shall be followed up as soon as
      practicable with written notice explaining the nature of the
  outage.
| | ------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|9.7.2 | Interruption of Service.If required by Good
      Utility Practice to do so, Transmission Provider may require
      Interconnection Customer to interrupt or reduce deliveries of electricity
      if such delivery of electricity could adversely affect Transmission
      Provider's ability to perform such activities as are necessary to safely
      and reliably operate and maintain the Transmission System. The following
      provisions shall apply to any interruption or reduction permitted under
      this Article 9.7.2:
|----- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 9.7.2.1 | The interruption or reduction shall continue only for so
      long as reasonably necessary under Good Utility Practice;                                                                                                                                                                                                                                                                                                               
| | ------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |         |                                                                                                                                                                                                                                                                                                                                                                                                                                        
| | 9.7.2.2 | Any such interruption or reduction shall be made on an
      equitable, non-discriminatory basis with respect to all generating
      facilities directly connected to the Transmission System;                                                                                                                                                                                                                                        
| |         |                                                                                                                                                                                                                                                                                                                                                                                                                                        
| | 9.7.2.3 | When the interruption or reduction must be made under
      circumstances which do not allow for advance notice, Transmission Provider
      shall notify Interconnection Customer by telephone as soon as practicable
      of the reasons for the curtailment, interruption, or reduction, and, if
      known, its expected duration. Telephone notification shall be followed by
      written notification as soon as practicable;
| |         |                                                                                                                                                                                                                                                                                                                                                                                                                                        
| | 9.7.2.4 | Except during the existence of an Emergency Condition,
      when the interruption or reduction can be scheduled without advance
      notice, Transmission Provider shall notify Interconnection Customer in
      advance regarding the timing of such scheduling and further notify
      Interconnection Customer of the                                                                                                           

|Issued by: Mario Villar | 34 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                                       
|-------------------------------------------- | --------------------------------------
|FERC Electric Tariff                         | Service Agreement No.
      __07-01534
|Third Revised Volume No. 1                   |                                       
|Open Access Transmission Tariff              |                                       

expected duration. Transmission
Provider shall coordinate with Interconnection Customer using Good Utility
Practice to schedule the interruption or reduction during periods of least
impact to Interconnection Customer and Transmission Provider;

| | 9.7.2.5 | The Parties shall cooperate and coordinate with each
      other to the extent necessary in order to restore the Large Generating
      Facility, Interconnection Facilities, and the Transmission System to their
      normal operating state, consistent with system conditions and Good Utility
      Practice.
| | ------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|9.7.3 | Under-Frequency and Over Frequency Conditions.The
      Transmission System is designed to automatically activate a load-shed
      program as required by the Applicable Reliability Council in the event of
      an under-frequency system disturbance. Interconnection Customer shall
      implement under-frequency and over-frequency relay set points for the
      Large Generating Facility as required by the Applicable Reliability
      Council to ensure "ride through" capability of the Transmission System.
      Large Generating Facility response to frequency deviations of
      pre-determined magnitudes, both under-frequency and overfrequency
      deviations, shall be studied and coordinated with Transmission Provider in
      accordance with Good Utility Practice. The term "ride through" as used
      herein shall mean the ability of a Generating Facility to stay connected
      to and synchronized with the Transmission System during system
      disturbances within a range of under-frequency and over- frequency
      conditions, in accordance with Good Utility
Practice.
|----- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|9.7.4 | System Protection and Other Control
      Requirements.
|----- | -------------------------------------------------------

| | 9.7.4.1 | System Protection Facilities.Interconnection
      Customer shall, at its expense, install, operate and maintain System
      Protection Facilities as a part of the Large Generating Facility or
      Interconnection Customer's Interconnection Facilities. Transmission
      Provider shall install at Interconnection Customer's expense any System
      Protection Facilities that may be required on Transmission Provider's
      Interconnection Facilities or the Transmission System as a result of the
      interconnection of the Large Generating Facility and Interconnection
      Customer's Interconnection Facilities.
| | ------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
| | 9.7.4.2 | Each Party's protection facilities shall be designed and
      coordinated with other systems in accordance with Good Utility
      Practice.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
| |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
| | 9.7.4.3 | Each Party shall be responsible for protection of its
      facilities consistent with Good Utility
Practice.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

|Issued by: Mario Villar | 35 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                                
|-------------------------------------------- | -------------------------------
|FERC Electric Tariff                         | Service Agreement No. _07-01534
|Third Revised Volume No. 1                   |                                
|Open Access Transmission Tariff              |                                

| | 9.7.4.4     | Each Party's protective relay design shall
      incorporate the necessary test switches to perform the tests required in
      Article 6. The required test switches will be placed such that they allow
      operation of lockout relays while preventing breaker failure schemes from
      operating and causing unnecessary breaker operations and/or the tripping
      of Interconnection Customer's units.                                                                                                                                                                                                                                                           
| | ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
| | **9.7.4.5** | Each Party will test, operate and
      maintain System Protection Facilities in accordance with Good Utility
      Practice.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
| |             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
| | **9.7.4.6** | Prior to the In-Service Date, and again prior
      to the Commercial Operation Date, each Party or its agent shall perform a
      complete calibration test and functional trip test of the System
      Protection Facilities. At intervals suggested by Good Utility Practice and
      following any apparent malfunction of the System Protection Facilities,
      each Party shall perform both calibration and functional trip tests of its
      System Protection Facilities. These tests do not require the tripping of
      any in-service generation unit. These tests do, however, require that all
      protective relays and lockout contacts be activated.

|9.7.5 | Requirements for Protection.In compliance
      with Good Utility Practice, Interconnection Customer shall provide,
      install, own, and maintain relays, circuit breakers and all other devices
      necessary to remove any fault contribution of the Large Generating
      Facility to any short circuit occurring on the Transmission System not
      otherwise isolated by Transmission Provider's equipment, such that the
      removal of the fault contribution shall be coordinated with the protective
      requirements of the Transmission System. Such protective equipment shall
      include, without limitation, a disconnecting device or switch with
      load-interrupting capability located between .the Large
      Generating Facility and the Transmission System at a site selected upon
      mutual agreement (not to be unreasonably withheld, conditioned or delayed)
      of the Parties. Interconnection Customer shall be responsible for
      protection of the Large Generating Facility and Interconnection Customer's
      other equipment from such conditions as negative sequence currents, over-
      or under-frequency, sudden load rejection, over-or under-voltage, and
      generator loss-of-field. Interconnection Customer shall be solely
      responsible to disconnect the Large Generating Facility and
      Interconnection Customer's other equipment if conditions on the
      Transmission System could adversely affect the Large Generating
      Facility.
|----- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|9.7.6 | Power Quality.Neither Party's facilities shall
      cause excessive voltage flicker nor introduce excessive distortion to the
      sinusoidal voltage or current waves as defined by ANSI Standard
      C84.1-1989, in accordance with IEEE Standard 519, or any applicable
      superseding electric industry standard. In the
event                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              

|Issued by: Mario Villar | 36 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                                
|-------------------------------------------- | -------------------------------
|FERC Electric Tariff                         | Service Agreement No. _07-01534
|Third Revised Volume No. 1                   |                                
|Open Access Transmission Tariff              |                                

of a conflict between ANSI Standard
C84.1 -1989, or any applicable superseding electric industry standard, ANSI
Standard C84.1 -1989, or the applicable superseding electric industry standard,
shall control.

|9.8 | Switching and Tagging Rules. Each Party shall
      provide the other Party a copy of its switching and tagging rules that are
      applicable to the other Party's activities. Such switching and tagging
      rules shall be developed on a non-discriminatory basis. The Parties shall
      comply with applicable switching and tagging rules, as amended from time
      to time, in obtaining clearances for workor for switching
      operations on equipment.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|9.9 | Use of Interconnection Facilities by Third
      Parties.                                                                                                                                                                                                                                                                                                                                                                                                                

| | 9.9.1 | Purpose of Interconnection Facilities.Except as
      may be required by Applicable Laws and Regulations, or as otherwise agreed
      to among the Parties, the Interconnection Facilities shall be constructed
      for the sole purpose of interconnecting the Large Generating Facility to
      the Transmission System and shall be used for no other purpose.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
| | ----- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
| | 9.9.2 | Third Party Users.If required by Applicable Laws
      and Regulations or it the Parties mutually agree, such agreement not to be
      unreasonably withheld, to allow one or more third parties to use
      Transmission Provider's Interconnection Facilities, or any part thereof,
      Interconnection Customer will be entitled to compensation for the capital
      expenses it incurred in connection with the Interconnection Facilities
      based upon the pro rata use of the Interconnection Facilities by
      Transmission Provider, all third party users, and Interconnection
      Customer, in accordance with Applicable Laws and Regulations or upon some
      other mutually-agreed upon methodology. In addition, cost responsibility
      for ongoing costs, including operation and maintenance costs associated
      with the Interconnection Facilities, will be allocated between
      Interconnection Customer and any third party users based upon the pro rata
      use of the Interconnection and any third party users based upon the pro
      rata use of the Interconnection Facilities by Transmission Provider, all
      third party users, and Interconnection Customer, in accordance with
      Applicable Laws and Regulations or upon some other mutually agreed upon
      methodology.

|9.10 | Disturbance Analysis Data Exchange.The Parties
      will cooperate with one another in the analysis of disturbances to either
      the Large Generating Facility or Transmission Provider's Transmission
      System by gathering and providing access to any information relating to
      any disturbance, including information from oscillography, protective
      relay targets, breaker operations and sequence of events records, and any
      disturbance information required by Good Utility
  Practice.
|---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Issued by: Mario Villar | 37 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                                
|-------------------------------------------- | -------------------------------
|FERC Electric Tariff                         | Service Agreement No. _07-01534
|Third Revised Volume No. 1                   |                                
|Open Access Transmission Tariff              |                                

Article 10. Maintenance

|10.1 | Transmission Provider Obligations.Transmission
      Provider shall maintain the Transmission System and Transmission
      Provider's Interconnection Facilities in a safe and reliable manner and in
      accordance with this LGIA.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|---- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|10.2 | Interconnection Customer Obligations.      Interconnection Customer shall maintain the Large Generating Facility and
      Interconnection Customer's Interconnection Facilities in a safe and
      reliable manner and in accordance with this LGIA.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|10.3 | Coordination.The Parties shall confer regularly
      to coordinate the planning, scheduling and performance of preventive and
      corrective maintenance on the Large Generating Facility and the
      Interconnection Facilities.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|10.4 | Secondary Systems.Each Party shall cooperate with
      the other in the inspection, maintenance, and testing of control or power
      circuits that operate below 600 volts, AC or DC, including, but not
      limited to, any hardware, control or protective devices, cables,
      conductors, electric raceways, secondary equipment panels, transducers,
      batteries, chargers, and voltage and current transformers that directly
      affect the operation of a Party's facilities and equipment which may
      reasonably be expected to impact the other Party. Each Party shall provide
      advance notice to the other Party before undertaking any work on such
      circuits, especially on electrical circuits involving circuit breaker trip
      and close contacts, current transformers, or potential
  transformers.
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|10.5 | Operating and Maintenance Expenses.Subject to the
      provisions herein addressing the use of facilities by others, and except
      for operations and maintenance expenses associated with modifications made
      for providing interconnection or transmission service to a third party and
      such third party pays for such expenses, Interconnection Customer shall be
      responsible for all reasonable expenses including overheads, associated
      with: (1) owning, operating, maintaining, repairing, and replacing
      Interconnection Customer's Interconnection Facilities; and (2) operation,
      maintenance, repair and replacement of Transmission Provider's
      Interconnection Facilities.                                                                                                                   

Article 11. Performance Obligation

|11.1 | Interconnection Customer Interconnection Facilities.Interconnection Customer shall design, procure, construct, install,
      own and/or control Interconnection Customer Interconnection Facilities
      described in Appendix A, Interconnection Facilities, Network Upgrades and
      Distribution Upgrades, at its sole expense.                                                           
|---- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                  
|11.2 | Transmission Provider's Interconnection Facilities.Transmission Provider or Transmission Owner shall design, procure,
      construct, install, own and/or control the Transmission Provider's
      Interconnection Facilities described in Appendix A, Interconnection
      Facilities, Network Upgrades and Distribution Upgrades, at the sole
      expense of the Interconnection Customer.

|Issued by: Mario Villar | 38 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                                      
|-------------------------------------------- | -------------------------------------
|FERC Electric Tariff                         | Service Agreement
      No.__07-01534
|Third Revised Volume No. 1                   |                                      
|Open Access Transmission Tariff              |                                      

|11.3 | Network Upgrades and Distribution Upgrades.Transmission Provider or Transmission Owner shall design, procure,
      construct, install, and own the Network Upgrades and Distribution Upgrades
      described in Appendix A, Interconnection Facilities, Network Upgrades and
      Distribution Upgrades. The Interconnection Customer shall be responsible
      for all costs related to Distribution Upgrades. Unless Transmission
      Provider or Transmission Owner elects to fund the capital for the Network
      Upgrades, they shall be solely funded by Interconnection
  Customer.
|---- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|11.4 | Transmission Credits.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             

| | 11.4.1 | Repayment of Amounts Advanced for Network
      Upgrades.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
| | ------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
| |        | Interconnection Customer shall be entitled to a cash
      repayment, equal to the total amount paid to Transmission Provider and
      Affected System Operator, if any, for the Network Upgrades, including any
      tax gross-up or other tax-related payments associated with Network
      Upgrades, and not refunded to Interconnection Customer pursuant to Article
      5.17.8 or otherwise, to be paid to Interconnection Customer on a dollar-
      for-dollar basis for the non-usage sensitive portion of transmission
      charges, as payments are made under Transmission Provider's Tariff and
      Affected System's Tariff for transmission services with respect to the
      Large Generating Facility. Any repayment shall include interest calculated
      in accordance with the methodology set forth in FERC's regulations at 18
      C.F.R. 35.19a(a) (2) (iii) from the date of any payment for Network Upgrades
      through the date on which the Interconnection Customer receives a
      repayment of such payment pursuant to this subparagraph. Interconnection
      Customer may assign such repayment rights to any person.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
| |        | Notwithstanding the foregoing, Interconnection Customer,
      Transmission Provider, and Affected System Operator may adopt any
      alternative payment schedule that is mutually agreeable so long as
      Transmission Provider and Affected System Operator take one of the
      following actions no later than five years from the Commercial Operation
      Date: (1) return to Interconnection Customer any amounts advanced for
      Network Upgrades not previously repaid, or (2) declare in writing that
      Transmission Provider or Affected System Operator will continue to provide
      payments to Interconnection Customer on a dollar-for-dollar basis for the
      non-usage sensitive portion of transmission charges, or develop an
      alternative schedule that is mutually agreeable and provides for the
      return of all amounts advanced for Network Upgrades not previously repaid;
      however, full reimbursement shall not extend beyond twenty (20) years from
      the Commercial Operation Date. If the Large Generating Facility fails to
      achieve commercial operation, but it or another Generating Facility is
      later constructed and makes use of the Network Upgrades, Transmission
      Provider and Affected System Operator shall at that time reimburse
      Interconnection Customer for the amounts advanced for the Network
      Upgrades. Before any such reimbursement can occur, the Interconnection
      Customer, or the entity that ultimately constructs the Generating
      Facility, if different, is responsible for identifying the entity to which
      reimbursement must be made.

|Issued by: Mario Villar | 39 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                                      
|-------------------------------------------- | -------------------------------------
|FERC Electric Tariff                         | Service Agreement
      No.__07-01534
|Third Revised Volume No. 1                   |                                      
|Open Access Transmission Tariff              |                                      

| | **11.4.2** | Special Provisions for Affected Systems.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
| | ---------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
| |            | Unless Transmission Provider provides, under
      the LGIA, for the repayment of amounts advanced to Affected System
      Operator for Network Upgrades, Interconnection Customer and Affected
      System Operator shall enter into an agreement that provides for such
      repayment. The agreement shall specify the terms governing payments to be
      made by Interconnection Customer to the Affected System Operator as well
      as the repayment by the Affected System Operator.                                                                                                                                                                                                                  
| |            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
| | **11.4.3** | Notwithstanding any other provision of this
      LGIA, nothing herein shall be construed as relinquishing or foreclosing
      any rights, including but not limited to firm transmission rights,
      capacity rights, transmission congestion rights, or transmission credits,
      that Interconnection Customer, shall be entitled to, now or in the future
      under any other agreement or tariff as a result of, or otherwise
      associated with, the transmission capacity, if any, created by the
      Network Upgrades, including the right to obtain cash reimbursements or
      transmission credits for transmission service that is not associated with
      the Large Generating Facility.

|11.5 | Provision of Security.At least thirty (30)
      Calendar Days prior to the commencement of the procurement, installation,
      or construction of a discrete portion of a Transmission Provider's
      Interconnection Facilities, Network Upgrades, or Distribution Upgrades,
      Interconnection Customer shall provide Transmission Provider, at
      Interconnection Customer's option, a guarantee, a surety bond, letter of
      credit or other form of security that is reasonably acceptable to
      Transmission Provider and is consistent with the Uniform Commercial Code
      of the jurisdiction identified in Article 14.2.1. Such security for
      payment shall be in an amount sufficient to cover the costs for
      constructing, procuring and installing the applicable portion of
      Transmission Provider's Interconnection Facilities, Network Upgrades, or
      Distribution Upgrades and shall be reduced on a dollar-for---dollar basis
      for payments made to Transmission Provider for these
  purposes.
|---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

In addition:

| | **11.5.1** | The guarantee must be made by an entity
      that meets the creditworthiness requirements of Transmission Provider, and
      contain terms and conditions that guarantee payment of any amount that may
      be due from Interconnection Customer, up to an agreed-to maximum amount.
| | ---------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |            |                                                                                                                                                                                                                                                                                         
| | **11.5.2** | The letter of credit must be issued by a
      financial institution reasonably acceptable to Transmission Provider and
      must specify a reasonable expiration date.                                                                                                                
| |            |                                                                                                                                                                                                                                                                                         
| | **11.5.3** | The surety bond must be issued by an
      insurer reasonably acceptable to Transmission Provider and must specify a
      reasonable expiration date.                                                                                                                                  

|Issued by: Mario Villar | 40 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                                      
|-------------------------------------------- | -------------------------------------
|FERC Electric Tariff                         | Service Agreement
      No.__07-01534
|Third Revised Volume No. 1                   |                                      
|Open Access Transmission Tariff              |                                      

Article 12. Invoice

|12.1 | General.Each Party shall submit to the other
      Party, on a monthly basis, invoices of amounts due for the preceding
      month. Each invoice shall state the month to which the invoice applies and
      fully describe the services and equipment provided. The Parties may
      discharge mutual debts and payment obligations due and owing to each other
      on the same date through netting, in which case all amounts a Party owes
      to the other Party under this LGIA, including interest payments or
      credits, shall be netted so that only the net amount remaining due shall
      be paid by the owing Party.                                                                                                                                                                                                                                      
|---- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|12.2 | Final Invoice.Within six months after completion
      of the construction of Transmission Provider's Interconnection Facilities
      and the Network Upgrades, Transmission Provider shall provide an invoice
      of the final cost of the construction of Transmission Provider's
      Interconnection Facilities and the Network Upgrades and shall set forth
      such costs in sufficient detail to enable Interconnection Customer to
      compare the actual costs with the estimates and to ascertain deviations,
      if any, from the cost estimates. Transmission Provider shall refund to
      Interconnection Customer any amount by which the actual payment by
      Interconnection Customer for estimated costs exceeds the actual costs of
      construction within thirty (30) Calendar Days of the issuance of such
      final construction invoice.
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|12.3 | Payment.Invoices shall be rendered to the paying
      Party at the address specified in Appendix F. The Party receiving the
      invoice shall pay the invoice within thirty (30) Calendar Days of receipt.
      All payments shall be made in immediately available funds payable to the
      other Party, or by wire transfer to a bank named and account designated by
      the invoicing Party. Payment of invoices by either Party will not
      constitute a waiver of any rights or claims either Party may have under
      this LGIA.                                                                                                                                                                                                                                                                                                                              
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|12.4 | Disputes.In the event of a billing dispute
      between Transmission Provider and Interconnection Customer, Transmission
      Provider shall continue to provide Interconnection Service under this LGIA
      as long as Interconnection Customer: (i) continues to make all payments
      not in dispute; and (ii) pays to Transmission Provider or into an
      independent escrow account the portion of the invoice in dispute, pending
      resolution of such dispute. If Interconnection Customer fails to meet
      these two requirements for continuation of service, then Transmission
      Provider may provide notice to Interconnection Customer of a Default
      pursuant to Article 17. Within thirty (30) Calendar Days after the
      resolution of the dispute, the Party that owes money to the other Party
      shall pay the amount due.        

A r t i c le 13. Emergencies

|13.1 | Definition."Emergency Condition" shall mean a
      condition or situation: (i) that in the judgment of the Party making the
      claim is imminently likely to endanger life or property; or (ii) that, in
      the case of Transmission Provider, is imminently likely (as determined in
      a non- discriminatory manner) to cause a material adverse effect on the
      security of, or damage to the Transmission System, Transmission Provider's
      Interconnection Facilities or the Transmission Systems
of
|---- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Issued by: Mario Villar | 41 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

others to which the Transmission System
is directly connected; or (iii) that, in the case of Interconnection Customer,
is imminently likely (as determined in a non-discriminatory manner) to cause a
material adverse effect on the security of, or damage to, the Large Generating
Facility or Interconnection Customer's Interconnection Facilities' System
restoration and black start shall be considered Emergency Conditions; provided,
that Interconnection Customer is not obligated by this LGIA to possess black
start capability.

|13.2 | Obligations.Each Party shall comply with the
      Emergency Condition procedures of the applicable ISO/RTO, NERO, the
      Applicable Reliability Council, Applicable Laws and Regulations, and any
      emergency procedures agreed to by the Joint Operating Committee.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|---- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|13.3 | Notice.Transmission Provider shall notify
      Interconnection Customer promptly when it becomes aware of an Emergency
      Condition that affects Transmission Provider's Interconnection Facilities
      or the Transmission System that may reasonably be expected to affect
      Interconnection Customer's operation of the Large Generating Facility or
      Interconnection Customer's Interconnection Facilities. Interconnection
      Customer shall notify Transmission Provider promptly when it becomes aware
      of an Emergency Condition that affects the Large Generating Facility or
      Interconnection Customer's Interconnection Facilities that may reasonably
      be expected to affect the Transmission System or Transmission Provider's
      Interconnection Facilities. To the extent information is known, the
      notification shall describe the Emergency Condition, the extent of the
      damage or deficiency, the expected effect on the operation of
      Interconnection Customer's or Transmission Provider's facilities and
      operations, its anticipated duration and the corrective action taken
      and/or to be taken. The initial notice shall be followed as soon as
      practicable with written notice,
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|13.4 | Immediate Action.Unless, in Interconnection
      Customer's reasonable judgment, immediate action is required,
      Interconnection Customer shall obtain the consent of Transmission
      Provider, such consent to not be unreasonably withheld, prior to
      performing any manual switching operations at the Large Generating
      Facility or Interconnection Customer's Interconnection Facilities in
      response to an Emergency Condition either declared by Transmission
      Provider or otherwise regarding the Transmission System.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|13.5 | Transmission ProviderAuthority.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

| | 13.5.1 | General.Transmission Provider may take whatever
      actions or
| | ------ | ----------------------------------------------------------------

necessary during an Emergency
Condition in order to i) preserve public health and safety, (ii) preserve the
reliability of the Transmission System or Transmission Provider's
Interconnection Facilities, (iii) limit or prevent damage, and (iv) expedite
restoration of service.

Transmission Provider shall use
Reasonable Efforts to minimize the effect of such actions or inactions on the
Large Generating Facility or Interconnection Customer's Interconnection
Facilities. Transmission Provider may, on the basis of

|Issued by: Mario Villar | 42 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

technical considerations, require the
Large Generating Facility to mitigate an Emergency Condition by taking actions
necessary and limited in scope to remedy the Emergency Condition, including, but
not limited to, directing Interconnection Customer to shut-down, start-up,
increase or decrease the real or reactive power output of the Large Generating
Facility; implementing a reduction or disconnection pursuant to Article 13.5.2;
directing Interconnection Customer to assist with blackstart (if available) or
restoration efforts; or altering the outage schedules of the Large Generating
Facility and Interconnection Customer's Interconnection Facilities.
Interconnection Customer shall comply with all of Transmission Provider's
operating instructions concerning Large Generating Facility real power and
reactive power output within the manufacturer's design limitations of the Large
Generating Facility's equipment that is in service and physically available for
operation at the time, in compliance with Applicable Laws and Regulations.

| | 13.5.2 | Reduction and Disconnection.Transmission Provider
      may reduce Interconnection Service or disconnect the Large Generating
      Facility or Interconnection Customer's Interconnection Facilities, when
      such, reduction or disconnection is necessary under Good Utility Practice
      due to Emergency Conditions. These rights are separate and distinct from
      any right of curtailment of Transmission Provider pursuant to Transmission
      Provider's Tariff. When Transmission Provider can schedule the reduction
      or disconnection in advance, Transmission Provider shall notify
      Interconnection Customer of the reasons, timing and expected duration of
      the reduction or disconnection. Transmission Provider shall coordinate
      with Interconnection Customer using Good Utility Practice to schedule the
      reduction or disconnection during periods of least impact to
      Interconnection Customer and Transmission Provider. Any reduction or
      disconnection shall continue only for so long as reasonably necessary
      under Good Utility Practice. The Parties shall cooperate with each other
      to restore the Large Generating Facility, the Interconnection Facilities,
      and the Transmission System to their normal operating state as soon as
      practicable consistent with Good Utility
Practice.
| | ------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|13.6 | Interconnection Customer Authority.Consistent
      with Good Utility Practice and the LGIA and the LGIP, Interconnection
      Customer may take actions or inactions with regard to the Large Generating
      Facility or Interconnection Customer's Interconnection Facilities during
      an Emergency Condition in order to (i) preserve public health and safety,
      (ii) preserve the reliability of the Large Generating Facility or
      Interconnection Customer's Interconnection Facilities, (iii) limit or
      prevent damage, and (iv) expedite restoration of service. Interconnection
      Customer shall use Reasonable Efforts to minimize the effect of such
      actions or inactions on the Transmission System and Transmission
      Provider's Interconnection Facilities. Transmission Provider shall use
      Reasonable Efforts to assist Interconnection Customer in such
    actions.
|---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Issued by: Mario Villar | 43 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|13.7 | Limited Liability.Neither Party shall be liable
      to the other for any action it takes in responding to an Emergency
      Condition so long as such action is made in good faith and is consistent
      with Good Utility Practice.
|---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Article 14. Regulatory Requirements and Governing
Law

|14.1 | Regulatory Requirements.Each Party's obligations
      under this LGIA shall be subject to its receipt of any required approval
      or certificate from one or more Governmental Authorities in the form and
      substance satisfactory to the applying Party, or the Party making any
      required filings with, or providing notice to, such Governmental
      Authorities, and the expiration of any time period associated therewith.
      Each Party shall in good faith seek and use its Reasonable Efforts to
      obtain such other approvals. Nothing in this LGIA shall require
      Interconnection Customer to take any action that could result in its
      inability to obtain, or its loss of, status or exemption under the Federal
      Power Act, the Public Utility Holding Company Act of 1935, as amended, or
      the Public Utility Regulatory Policies Act of 1978.
|---- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|14.2 | Governing Law.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          

| | 14.2.1 | The validity, interpretation and performance of this LGIA
      and each of its provisions shall be governed by the laws of the state
      where the Point of Interconnection is located, without regard to its
      conflicts of law principles.
| | ------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |        |                                                                                                                                                                                                                                                    
| | 14.2.2 | This LGIA is subject to all Applicable Laws and
      Regulations.                                                                                                                                                                                 
| |        |                                                                                                                                                                                                                                                    
| | 14.2.3 | Each Party expressly reserves the right to seek changes
      in, appeal, or otherwise contest any laws, orders, rules, or regulations
      of a Governmental Authority.                                                                          

Article 15. Notices.

|15.1 | General.Unless otherwise provided in this LGIA,
      any notice, demand or request required or permitted to be given by either
      Party to the other and any instrument required or permitted to be tendered
      or delivered by either Party in writing to the other shall be effective
      when delivered and may be so given, tendered or delivered, by recognized
      national courier, or by depositing the same with the United States Postal
      Service with postage prepaid, for delivery by certified or registered
      mail, addressed to the Party, or personally delivered to the Party, at the
      address set out in Appendix If, Addresses for Delivery of Notices and
      Billings. Either Party may change the notice information in this LGIA by
      giving five (5) Business Days written notice prior to the effective date
      of the change.
|---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|15.2 | Billings and Payments.Billings and payments shall
      be sent to the addresses set out in Appendix
F.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

|Issued by: Mario Villar | 44 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|15.3 | Alternative Forms of Notice.Any notice or request
      required or permitted to be given by a Party to the other and not required
      by this Agreement to be given in writing may be so given by telephone,
      facsimile or email to the telephone numbers and email addresses set out in
      Appendix F.
|---- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                   
|15.4 | Operations and Maintenance Notice.Each Party
      shall notify the other Party in writing of the identity of the person(s)
      that it designates as the point(s) of contact with respect to the
      implementation of Articles 9 and 10.                                                                    

Article 16. Force Majeure

|16.1 | Force Majeure.
|---- | --------------

| | 16.1.1 | Economic hardship is not considered a Force Majeure
      event.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
| | ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
| | 16.1.2 | Neither Party shall be considered to be in Default with
      respect to any obligation hereunder, (including obligations under Article
      4), other than the obligation to pay money when due, if prevented from
      fulfilling such obligation by Force Majeure. A Party unable to fulfill any
      obligation hereunder (other than an obligation to pay money when due) by
      reason of Force Majeure shall give notice and the full particulars of such
      Force Majeure to the other Party in writing or by telephone as soon as
      reasonably possible after the occurrence of the cause relied upon.
      Telephone notices given pursuant to this article shall be confirmed in
      writing as soon as reasonably possible and shall specifically state full
      particulars of the Force Majeure, the time and date when the Force Majeure
      occurred and when the Force Majeure is reasonably expected to cease. The
      Party affected shall exercise due diligence to remove such disability with
      reasonable dispatch, but shall not be required to accede or agree to any
      provision not satisfactory to it in order to settle and terminate a strike
      or other labor disturbance.

Article 17. Default

|17.1 | Default
|---- | -------

| | **17.1.1** | General.No Default shall exist where
      such failure to discharge an obligation {other than the payment of money)
      is the result of Force Majeure as defined in this LGIA or the result of an
      act of omission of the other Party. Upon a Breach, the non-breaching Party
      shall give written notice of such Breach to the breaching Party. Except as
      provided in Article 17.1.2, the breaching Party shall have thirty (30)
      Calendar Days from receipt of the Default notice within which to cure such
      Breach; provided however, if such Breach is not capable of cure within
      thirty (30) Calendar Days, the breaching Party shall commence such cure
      within thirty (30) Calendar Days after notice and continuously and
      diligently complete such cure within ninety {90) Calendar Days from
      receipt of the Default notice; and, if cured within such time, the Breach
      specified in such notice shall cease to exist.
| | ---------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Issued by: Mario Villar | 45 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

| | 17.1.2 | Right to Terminate.If a Breach is not cured as
      provided in this article, or if a Breach is not capable of being cured
      within the period provided for herein, the non-breaching Party shall have
      the right to declare a Default and terminate this LGIA by written notice
      at any time until cure occurs, and be relieved of any further obligation
      hereunder and, whether or not that Party terminates this LGIA, to recover
      from the breaching Party all amounts due hereunder, plus all other damages
      and remedies to which it is entitled at law or in equity. The provisions
      of this article will survive termination of this
LGIA.
| | ------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Article 18. Indemnity, Consequential Damages and
Insurance

|18.1 | Indemnity.The Parties shall at all times
      indemnify, defend, and hold the other Party harmless from, any and all
      damages, losses, claims, including claims and actions relating to injury
      to or death of any person or damage to property, demand, suits,
      recoveries, costs and expenses, court costs, attorney fees, and all other
      obligations by or to third parties, arising out of or resulting from the
      other Party's action or inactions of its obligations under this LGIA on
      behalf of the Indemnifying Party, except in cases of gross negligence or
      intentional wrongdoing by the Indemnified
Party.
|---- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | **18.1.1** | Indemnified Person.If an Indemnified
      Person is entitled to indemnification under this Article 18 as a result of
      a claim by a third party, and the indemnifying Party fails, after notice
      and reasonable opportunity to proceed under Article 18.1, to assume the
      defense of such claim, such Indemnified Person may at the expense of the
      indemnifying Party contest, settle or consent to the entry of any judgment
      with respect to, or pay in full, such claim.                                                   
| | ---------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
| | **18.1.2** | Indemnifying Party.If an Indemnifying
      Party is obligated to indemnify and hold any Indemnified Person harmless
      under this Article 18, the amount owing to the Indemnified Person shall be
      the amount of such Indemnified Person's actual Loss, net of any insurance
      or other recovery.                                                                                                                                                                                                                                          
| |            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
| | **18.1.3** | Indemnity Procedures.Promptly after receipt by an Indemnified Person of any claim or
      notice of the commencement of any action or administrative or legal
      proceeding or investigation as to which the indemnity provided for in
      Article 18.1 may apply, the Indemnified Person shall notify the
      Indemnifying Party of such fact. Any failure of or delay in such
      notification shall not affect a Party's indemnification obligation unless
      such failure or delay is materially prejudicial to the indemnifying Party.
| |            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
| |            | The Indemnifying Party shall have the right to
      assume the defense thereof with counsel designated by such Indemnifying
      Party and reasonably satisfactory to the Indemnified Person. If the
      defendants in any such action include one or more Indemnified Persons and
      the Indemnifying Party and if the Indemnified Person reasonably concludes
      that there may be legal defenses available to it and/or other Indemnified
      Persons which are different from or additional to those available to the                   

|Issued by: Mario Villar | 46 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |    |                     
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Indemnifying Party, the Indemnified
Person shall have the right to select separate counsel to assert such legal
defenses and to otherwise participate in the defense of such action on its own
behalf. In such instances, the Indemnifying Party shall only be required to pay
the fees and expenses of one additional attorney to represent an Indemnified
Person or Indemnified Persons having such differing or additional legal
defenses.

The Indemnified Person shall be
entitled, at its expense, to participate in any such action, suit or proceeding,
the defense of which has been assumed by the Indemnifying Party. Notwithstanding
the foregoing, the Indemnifying Party (i) shall not be entitled to assume and
control the defense of any such action, suit or proceedings if and to the extent
that, in the opinion of the Indemnified Person and its counsel, such action,
suit or proceeding involves the potential imposition of criminal liability on
the Indemnified Person, or there exists a conflict or adversity of interest
between the Indemnified Person and the Indemnifying Party, in such event the
Indemnifying Party shall pay the reasonable expenses of the Indemnified Person,
and (ii) shall not settle or consent to the entry of any judgment in any action,
suit or proceeding without the consent of the Indemnified Person, which shall
not be reasonably withheld, conditioned or delayed.

|18.2 | Consequential Damages.Other than the Liquidated
      Damages heretofore described, in no event shall either Party be liable
      under any provision of this LGIA for any losses, damages, costs or
      expenses for any special, indirect, incidental, consequential, or punitive
      damages, including but not limited to loss of profit or revenue, loss of
      the use of equipment, cost of capital, cost of temporary equipment or
      services, whether based in whole or in part in contract, in tort,
      including negligence, strict liability, or any other theory of liability;
      provided, however, that damages for which a Party may be liable to the
      other Party under another agreement will not be considered to be special,
      indirect, incidental, or consequential damages hereunder.
|---- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|18.3 | Insurance.Each party shall, at its own expense,
      maintain in force throughout the period of this LGIA, and until released
      by the other Party, the following minimum insurance coverages, with
      insurers authorized to do business in the state where the Point of
      Interconnection is located:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

| | 18.3.1 | Employers' Liability and Workers' Compensation Insurance
      providing statutory benefits in accordance with the laws and regulations
      of the state in which the Point of Interconnection is located.                                                                                                                                                                                                                                                                                                                                                                                                       
| | ------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
| | 18.3.2 | Commercial General Liability Insurance including premises
      and operations, personal injury, broad form property damage, broad form
      blanket contractual liability coverage (including coverage for the
      contractual indemnification) products and completed operations coverage,
      coverage for explosion, collapse and underground hazards, independent
      contractors coverage, coverage for pollution to the extent normally
      available and punitive damages to the extent normally available and a
      cross liability endorsement, with minimum limits of One Million
    Dollars

|Issued by: Mario Villar | 47 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |    |                     
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

($1,000,000) per occurrence/One
Million Dollars ($1,000,000) aggregate combined single limit for personal
injury, bodily injury, including death and property damage.

| | **18.3.3** | Comprehensive Automobile Liability insurance
      for coverage of owned and non-owned and hired vehicles, trailers or semi-
      trailers designed for travel on public roads, with a minimum, combined
      single limit of One Million Dollars ($1,000,000) per occurrence for bodily
      injury, including death, and property damage.                                                                                                                                                                                                                                                                                                                                                                                               
| | ---------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
| | **18.3.4** | Excess Public Liability Insurance over and
      above the Employers' Liability Commercial General Liability and
      Comprehensive Automobile Liability Insurance coverage, with a minimum
      combined single limit of Twenty Million Dollars ($20,000,000) per
      occurrence/Twenty Million Dollars ($20,000,000) aggregate.                                                                                                                                                                                                                                                                                                                                                                                                        
| |            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
| | **18.3.5** | The Commercial General Liability
      Insurance, Comprehensive Automobile Insurance and Excess Public Liability
      Insurance policies shall name the other Party, its parent, associated and
      Affiliate companies and their respective directors, officers, agents,
      servants and employees ("Other Party Group") as additional insured. All
      policies shall contain provisions whereby the insurers waive all rights of
      subrogation in accordance with the provisions of this LGIA against the
      Other Party Group and provide thirty (30) Calendar Days advance written
      notice to the Other Party Group prior to anniversary date of cancellation
      or any material change in coverage or condition.
| |            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
| | **18.3.6** | The Commercial General Liability
      Insurance, Comprehensive Automobile Liability Insurance and Excess Public
      Liability Insurance policies shall contain provisions that specify that
      the policies are primary and shall apply to such extent without
      consideration for other policies separately carried and shall state that
      each insured is provided coverage as though a separate policy had been
      issues to each, except the insurer's liability shall not be increased
      beyond the amount for which the insurer would have been liable had only
      one insured been covered. Each Party shall be responsible for its
      respective deductibles or retentions.                               
| |            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
| | 18.3.7     | The Commercial General Liability Insurance,
      Comprehensive Automobile Liability Insurance and Excess Public Liability
      Insurance policies, if written on a Claims First Made Basis, shall be
      maintained in full force and effect for two (2) years after termination of
      this LGIA, which coverage may be in the form of tail coverage or extended
      reporting period coverage if agreed by the Parties.                                                                                                                                                                                                                                                                                                            
| |            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
| | **18.3.8** | The requirements contained herein as to the
      types and limits of all insurance to be maintained by the Parties are not
      intended to and shall not in any manner, limit or qualify the liabilities
      and obligations assumed by the Parties under this LGIA.                                                                                                                                                                                                                                                                                                                                                                                                                                                                    

|Issued by: Mario Villar | 48 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

| | 18.3.9  | Within ten (10) days following execution of this LGIA,
      and as soon as practicable after the end of each fiscal year or at the
      renewal of the insurance policy and in any event within ninety (90) days
      thereafter, each Party shall provide certification of all insurance
      required in this LGIA, executed by each insurer or by an authorized
      representative of each insurer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
| | ------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
| | 18.3.10 | Notwithstanding the foregoing, each Party may self-insure
      to meet the minimum insurance requirements of Articles 18.3.2 through
      18.3.8 to the extent it maintains a self-insurance program; provided that,
      such Party's senior secured debt is rated at investment grade or better by
      Standard & Poor's and that its self-insurance program meets the
      minimum insurance requirements of Articles 18.3.2 through 18.3,8. For any
      period of time that a Party's senior secured debt is unrated by Standard
      & Poor's or is rated at less than investment grade by Standard &
      Poor's, such Party shall comply with the insurance requirements applicable
      to it under Articles 18.3.2 through 18.3.9. In the event that a Party is
      permitted to self-insure pursuant to this article, it shall notify the
      other Party that it meets the requirements to self-insure and that its
      self- insurance program meets the minimum insurance requirements in a
      manner consistent with that specified in Article 18.3.9.
| |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
| | 18.3.11 | The Parties agree to report to each other in writing as
      soon as practical all accidents or occurrences resulting in injuries to
      any person, including death, and any property damage arising out of this
      LGIA.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

Article 19. Assignment

|19.1 | Assignment.This LGIA may be assigned by either
      Party only with the written consent of the other; provided that either
      Party may assign this LGIA without the consent of the other Party to any
      Affiliate of the assigning Party with an equal or greater credit rating
      and with the legal authority and operational ability to satisfy the
      obligations of the assigning Party under this LGIA; and provided further
      that Interconnection Customer shall have the right to assign this LGIA,
      without the consent of Transmission Provider, for collateral security
      purposes to aid in providing financing for the Large Generating Facility,
      provided that Interconnection Customer will promptly notify Transmission
      Provider of any such assignment. Any financing arrangement entered into by
      Interconnection Customer pursuant to this article will provide that prior
      to or upon the exercise of the secured Party's, trustee's or mortgagee's
      assignment rights pursuant to said arrangement, the secured creditor, the
      trustee or mortgagee will notify Transmission Provider of the date and
      particulars of any such exercise of assignment right(s), including
      providing the Transmission Provider with proof that it meets the
      requirements of Articles 11.5 and 18.3. Any attempted assignment that
      violates this article is void and ineffective. Any assignment under this
      LGIA shall not relieve a Party of its obligations, nor shall a Party's
      obligations be enlarged, in whole or in part, by reason thereof. Where
      required, consent to assignment will not be unreasonably withheld,
      conditioned or delayed.
|---- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Issued by: Mario Villar | 49 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Article 20. Severability

20.1 Severability,It any
provision in this LGIA is finally determined to be invalid, void or
unenforceable by any court or other Governmental Authority having jurisdiction,
such determination shall not invalidate, void or make unenforceable any other
provision, agreement or covenant of this LGIA; provided that if Interconnection
Customer (or any third party, but only if such third party is not acting at the
direction of Transmission Provider) seeks and obtains such a final determination
with respect to any provision of the Alternate Option (Article 5.1.2), or the
Negotiated Option (Article 5.1.4), then none of these provisions shall
thereafter have any force or effect and the Parties' rights and obligations
shall be governed solely by the Standard Option (Article 5.1.1) .

Article 21. Comparability

|21.1 | Comparability.The Parties will comply with all
      applicable comparability and code of conduct laws, rules and regulations,
      as amended from time to time.
|---- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------

Article 22. Confidentiality

|22.1 | Confidentiality.Confidential Information shall
      include, without limitation, all information relating to a Party's
      technology, research and development, business affairs, and pricing, and
      any information supplied by either of the Parties to the other prior to
      the execution of this LGIA.                                                                                                                                                                                                                                                                                                        
|---- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|     | Information is Confidential Information only if it is
      clearly designated or marked in writing as confidential on the face of the
      document, or, if the information is conveyed orally or by inspection, if
      the Party providing the information orally informs the Party receiving the
      information that the information is confidential.                                                                                                                                                                                                                                                                
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|     | If requested by either Party, the other Party shall
      provide in writing, the basis for asserting that the information referred
      to in this Article 22 warrants confidential treatment, and the requesting
      Party may disclose such writing to the appropriate Governmental Authority.
      Each Party shall be responsible for the costs associated with affording
      confidential treatment to its information.                                                                                                                                                                                           
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|     | Transmission Provider may perform study work using WECC
      data (power flow, stability, and disturbance monitoring data) for
      nonmembers provided that the WECC data are not provided to the nonmember.
      Under such arrangements the nonmembers are permitted to look at the data
      in the Transmission Provider's office to gain an understanding of the
      study results, but are not permitted to have the data or a copy of the
      data. Interconnection Customer must also sign the WECC Nonmember
      Confidentiality Agreement in accordance with regional Reliability Council
      policies.

|Issued by: Mario Villar | 50 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                                    
|-------------------------------------------- | -----------------------------------
|FERC Electric Tariff                         | Service AgreementNo.
      07-01534
|Third Revised Volume No. 1                   |                                    
|Open Access Transmission Tariff              |                                    

| | 22.1.1 | Term.During the term of
      this LGIA, and for a period of three (3) years after the expiration or
      termination of this LGIA, except as otherwise provided in this Article 22,
      each Party shall hold in confidence and shall not disclose to any person
      Confidential Information.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
| | ------ | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
| | 22.1.2 | **Scope.**Confidential Information shall not include information that the
      receiving Party can demonstrate: (1) is generally available to the public
      other than as a result of a disclosure by the receiving Party; (2) was in
      the lawful possession of the receiving Party on a non-confidential basis
      before receiving it from the disclosing Party; (3) was supplied to the
      receiving Party without restriction by a third party, who, to the
      knowledge of the receiving Party after due inquiry, was under no
      obligation to the disclosing Party to keep such information confidential;
      (4) was independently developed by the receiving Party without reference
      to Confidential Information of the disclosing Party; (5) is, or becomes,
      publicly known, through no wrongful act or omission of the receiving Party
      or Breach of this LGIA; or (6) is required, in accordance with Article
      22.1.7 of the LGIA, Order of Disclosure, to be disclosed by any
      Governmental Authority or is otherwise required to be disclosed by law or
      subpoena, or is necessary in any legal proceeding establishing rights and
      obligations under this LGIA. Information designated as Confidential
      Information will no longer be deemed confidential if the Party that
      designated the information as confidential notifies the other Party that
      it no longer is confidential.
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
| | 22.1.3 | Release of Confidential Information.Neither Party shall release or disclose Confidential Information to
      any other person, except to its Affiliates (limited by the Standards of
      Conduct requirements), subcontractors, employees, consultants, or to
      parties who may be or considering providing financing to or equity
      participation with Interconnection Customer, or to potential purchasers or
      assignees of Interconnection Customer, on a need-to-know basis in
      connection with this LGIA, unless such person has first been advised of
      the confidentiality provisions of this Article 22 and has agreed to comply
      with such provisions. Notwithstanding the foregoing, a Party providing
      Confidential Information to any person shall remain primarily responsible
      for any release of Confidential Information in contravention of this
      Article 22.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
| | 22.1.4 | **Rights.**Each
      Party retains all rights, title, and interest in the Confidential
      Information that each Party discloses to the other Party. The disclosure
      by each Party to the other Party of Confidential Information shall not be
      deemed a waiver by either Party or any other person or entity of the right
      to protect the Confidential Information from public disclosure.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
| | 22.1.5 | No Warranties.By providing Confidential
      Information, neither Party makes any warranties or representations as to
      its accuracy or completeness. In addition, by supplying Confidential
      Information, neither Party obligates itself to provide any particular
      information or Confidential Information                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

|Issued by: Mario Villar | 51 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

to the other Party nor to enter into
any further agreements or proceed with any other relationship or joint
venture.

| | 22.1.6 | Standard of Care.Each Party shall use at least
      the same standard of care to protect Confidential Information it receives
      as it uses to protect its own Confidential Information from unauthorized
      disclosure, publication or dissemination. Each Party may use Confidential
      Information solely to fulfill its obligations to the other Party under
      this LGIA or its regulatory requirements.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
| | ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
| | 22.1.7 | Order of Disclosure.If a court or a Government
      Authority or entity with the right, power, and apparent authority to do so
      requests or requires either Party, by subpoena, oral deposition,
      interrogatories, requests for production of documents, administrative
      order, or otherwise, to disclose Confidential information, that Party
      shall provide the other Party with prompt notice of such request(s) or
      requirement(s)so that the other Party may seek an appropriate protective
      order or waive compliance with the terms of this LGIA.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
| |        | Notwithstanding the absence of a protective order or
      waiver, the Party may disclose such Confidential Information which, in the
      opinion of its counsel, the Party is legally compelled to disclose. Each
      Party will use Reasonable Efforts to obtain reliable assurance that
      confidential treatment will be accorded any Confidential Information so
      furnished.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
| | 22.1.8 | Termination of Agreement.Upon termination of this
      LGIA for any reason, each Party shall, within ten (10) Calendar Days of
      receipt of a written request from the other Party, use Reasonable Efforts
      to destroy, erase, or delete (with such destruction, erasure, and deletion
      certified in writing to the other Party) or return to the other Party,
      without retaining copies thereof, any and all written or electronic
      Confidential Information received from the other Party.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
| | 22.1.9 | Remedies.The Parties agree that monetary damages
      would be inadequate to compensate a Party for the other Party's Breach of
      its obligations under this Article 22. Each Party accordingly agrees that
      the other Party shall be entitled to equitable relief, by way of
      injunction or otherwise, if the first Party Breaches or threatens to
      Breach its obligations under this Article 22, which equitable relief shall
      be granted without bond or proof of damages, and the receiving Party shall
      not plead in defense that there would be an adequate remedy at law. Such
      remedy shall not be deemed an exclusive remedy for the Breach of this
      Article 22, but shall be in addition to all other remedies available at
      law or in equity. The Parties further acknowledge and agree that the
      covenants contained herein are necessary for the protection of legitimate
      business interests and are reasonable in scope. No Party, however, shall
      be liable for indirect, incidental, or consequential or punitive damages
      of any nature or kind resulting from or arising in connection with this
      Article 22.

|Issued by: Mario Villar | 52 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating
      Companies
|--------------------------------------------------
|FERC Electric Tariff                              
|Third Revised Volume No. 1                        
|Open AccessTransmission
      Tariff              

| | 22.1.10 | Disclosure to FERC, its Staff, or a State.Notwithstanding anything in this Article 22 to the contrary, and
      pursuant to 18 CER section lb.20, if FERC or its staff, during the course
      of an investigation or otherwise, requests information from one of the
      Parties that is otherwise required to be maintained in confidence pursuant
      to this LGIA, the Party shall provide the requested information to FERC or
      its staff, within the time provided for in the request for information. In
      providing the information to FERC or its staff, the Party must, consistent
      with 18 CFR section 388.112, request that the information be treated as
      confidential and non-public by FERC and its staff and that the information
      be withheld from public disclosure. Parties are prohibited from notifying
      the other Party to this LGIA prior to the release of the Confidential
      Information to FERC or its staff. The Party shall notify the other Party
      to the LGIA when it is notified by FERC or its staff that a request to
      release Confidential Information has been received by FERC, at which time
      either of the Parties may respond before such information would be made
      public, pursuant to 18 CFR section 388.112. Requests from a state
      regulatory body conducting a confidential investigation shall be treated
      in a similar manner if consistent with the applicable state rules and
      regulations.                                                                                                                                                                                             
| | ------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
| | 22.1.11 | Subject to the exception in Article 22.1.10, any
      information that a Party claims is competitively sensitive, commercial or
      financial information under this LGIA ("Confidential Information") shall
      not be disclosed by the other Party to any person not employed or retained
      by the other Party, except to the extent disclosure is (i) required by
      law; (ii) reasonably deemed by the disclosing Party to be required to be
      disclosed in connection with a dispute between or among the Parties, or
      the defense of litigation or dispute; (iii) otherwise permitted by consent
      of the other Party, such consent not to be unreasonably withheld; or (iv)
      necessary to fulfill its obligations under this LGIA or as a transmission
      service provider or a Control Area operator including disclosing the
      Confidential Information to an RTO or ISO or to a regional or national
      reliability organization. The Party asserting confidentiality shall notify
      the other Party in writing of the information it claims is confidential.
      Prior to any disclosures of the other Party's Confidential Information
      under this subparagraph, or if any third party or Governmental Authority
      makes any request or demand for any of the information described in this
      subparagraph, the disclosing Party agrees to promptly notify the other
      Party in writing and agrees to assert confidentiality and cooperate with
      the other Party in seeking to protect the Confidential Information from
      public disclosure by confidentiality agreement, protective order or other
      reasonable measures.

|Issued by: Mario Villar | 53 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating
      Companies
|--------------------------------------------------
|FERC Electric Tariff                              
|Third Revised Volume No. 1                        
|Open Access Transmission
      Tariff             

Article 23. Environmental Releases

|23.1 | Each Party shall notify the other Party, first orally and
      then in writing, of the release of any Hazardous Substances, any asbestos
      or lead abatement activities, or any type of remediation activities
      related                                                                                                                                                                                                                                                                                                                                      
|---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|     | to the Large Generating Facility or the Interconnection
      Facilities, each of which may reasonably be expected to affect the other
      Party. The notifying Party shall: (i) provide the notice as soon as
      practicable, provided such Party makes a good faith effort to provide the
      notice no later than twenty-four hours after such Party becomes aware of
      the occurrence; and (ii) promptly furnish to the other Party copies of any
      publicly available reports filed with any Governmental Authorities
      addressing such events.

Article 24. Information Requirements

|24.1 | Information Acquisition.Transmission Provider and
      Interconnection Customer shall submit specific information regarding the
      electrical characteristics of their respective facilities to each other as
      described below and in accordance with Applicable Reliability
      Standards.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|24.2 | Information Submission by Transmission Provider.The initial information submission by Transmission Provider shall
      occur no later than one hundred eighty (180) Calendar Days prior to Trial
      Operation and shall include Transmission System information necessary to
      allow Interconnection Customer to select equipment and meet any system
      protection and stability requirements, unless otherwise agreed to by the
      Parties. On a monthly basis Transmission Provider shall provide
      Interconnection Customer a status report on the construction and
      installation of Transmission Provider's Interconnection Facilities and
      Network Upgrades, including, but not limited to, the following
      information: (1) progress to date; (2) a description of the activities
      since the last report" (3) a description of the action items for the next
      period; and (4) the delivery status of equipment ordered.                                                                             
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|24.3 | Updated Information Submission by Interconnection
      Customer.The updated information submission by Interconnection
      Customer, including manufacturer information, shall occur no later than
      one hundred eighty (180) Calendar Days prior to the Trial Operation.
      Interconnection Customer shall submit a completed copy of the Large
      Generating Facility data requirements contained in Appendix 1 to the LGIP.
      It shall also include any additional information provided to Transmission
      Provider for the Feasibility and Facilities Study. Information in this
      submission shall be the most current Large Generating Facility design or
      expected performance data. Information submitted for stability models
      shall be compatible with Transmission Provider standard models. If there
      is no compatible model, Interconnection Customer will work with a
      consultant mutually agreed to by the Parties to develop and supply a
      standard model and associated information.

|Issued by: Mario Villar | 54 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

If Interconnection
Customer's data is materially different from what was originally provided to
Transmission Provider pursuant to the Interconnection Study Agreement between
Transmission Provider and Interconnection Customer, then Transmission Provider
will conduct appropriate studies to determine the impact on Transmission
Provider Transmission System based on the actual data submitted pursuant to
this Article 24.3. The Interconnection Customer shall not begin Trial Operation
until such studies are completed.

|24.4 | Information Supplementation.Prior to the
      Operation Date, the Parties shall supplement their information submissions
      described above in this Article 24 with any and all "as-built"Large Generating Facility information or "as-tested" performance
      information that differs from the initial submissions or, alternatively,
      written confirmation that no such differences exist. The Interconnection
      Customer shall conduct tests on the Large Generating Facility as required
      by Good Utility Practice such as an open circuit "step voltage" test on
      the Large Generating Facility to verify proper operation of the Large
      Generating Facility's automatic voltage regulator.                                                                                                                                                                                                                                                                                                                                                    
|---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|     | Unless otherwise agreed, the test conditions shall
      include: (1) Large Generating Facility at synchronous speed; (2) automatic
      voltage regulator on and in voltage control mode; and (3) a five percent
      change in Large Generating Facility terminal voltage initiated by a change
      in the voltage regulators reference voltage. Interconnection Customer
      shall provide validated test recordings showing the responses of Large
      Generating Facility terminal and field voltages. In the event that direct
      recordings of these voltages is impractical, recordings of other voltages
      or currents that mirror the response of the Large Generating Facility's
      terminal or field voltage are acceptable if information necessary to
      translate these alternate quantities to actual Large Generating Facility
      terminal or field voltages is provided. Large Generating Facility testing
      shall be conducted and results provided to Transmission Provider for each
      individual generating unit in a station.
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|     | Subsequent to the Operation Date, Interconnection
      Customer shall provide Transmission Provider any information changes due
      to equipment replacement, repair, or adjustment. Transmission Provider
      shall provide Interconnection Customer any information changes due to
      equipment replacement, repair or adjustment in the directly connected
      substation or any adjacent Transmission Provider-owned substation that may
      affect Interconnection Customer's Interconnection Facilities equipment
      ratings, protection or operating requirements. The Parties shall provide
      such information no later than thirty (30) Calendar Days after the date of
    the equipment replacement, repair or adjustment.                                                                                                                                                                                                                                                                                                                           

Article 25. Information Accessand Audit
Rights

|25.1 | InformationAccess.Each Party (the
      "disclosing Party") shall make available to the other Party information
      that is in the possession of the disclosing Party and is necessary in
      order for the other Party to: (i) verify the costs incurred by the
      disclosing Party for which the other Party is responsible under this LGIA;
      and (ii) carry out its obligations
and responsibilities under this LGIA. The Parties shall not use such information for purposes other than those set forth in this Article 25.1 and to enforce their rights under this LGIA.
|---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Issued by: Mario Villar | 55 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|25.2                       | Reporting of Non-Force Majeure Events.Each Party
      (the "notifying Party") shall notify the other Party when the notifying
      Party becomes aware of its inability to comply with the provisions of this
      LGIA for a reason other than a Force Majeure event. The Parties agree to
      cooperate with each other and provide necessary information regarding such
      inability to comply, including the date, duration, reason for the
      inability to comply, and corrective actions taken or planned to be taken
      with respect to such inability to comply. Notwithstanding the                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|-------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|                           | foregoing, notification, cooperation or
      information provided under this article shall not entitle the Party
      receiving such notification to allege a cause for anticipatory breach of
      this LGIA.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|25.3                       | Audit Rights. Subject to the
      requirements of confidentiality under Article 22 of this LGIA, each Party
      shall have the right, during normal business hours, and upon prior
      reasonable notice to the other Party, to audit at its own expense the
      other Party's accounts and records pertaining to either Party's
      performance or either Party's satisfaction of obligations under this LGIA.
      Such audit rights shall include audits of the other Party's costs,
      calculation of invoiced amounts, Transmission Provider's efforts to
      allocate responsibility for the provision of reactive support to the
      Transmission System, Transmission Provider's efforts to allocate
      responsibility for interruption or reduction of generation on the
      Transmission System, and each Party's actions in an Emergency Condition.
      Any audit authorized by this article shall be performed at the offices
      where such accounts and records are maintained and shall be limited to
      those portions of such accounts and records that relate to each Party's
      performance and satisfaction of obligations under this LGIA. Each Party
      shall keep such accounts and records for a period equivalent to the audit
      rights periods described in Article 25.4.
|                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|25.4 Audit Rights Periods.

| | 25.4.1 | Audit Rights Period for Construction-Related Accounts
      and Records.Accounts and records related to the design, engineering,
      procurement, and construction of Transmission Provider's Interconnection
      Facilities and Network Upgrades shall be subject to audit for a period of
      twenty-four months following Transmission Provider's issuance of a final
      invoice in accordance with Article 12.2.                                                                                                                                                                                                                                                       
| | ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
| | 25.4.2 | Audit Rights Period for All Other Accounts and
      Records.Accounts and records related to either Party's performance or
      satisfaction of all obligations under this LGIA other than those described
      in Article 25.4.1 shall be subject to audit as follows: (i) for an audit
      relating to cost obligations, the applicable audit rights period shall be
      twenty-four months after the auditing Party's receipt of an invoice giving
      rise to such cost obligations; and (ii) for an audit relating to all other
      obligations, the applicable audit rights period shall be twenty- four
      months after the event for which the audit is
sought.

|Issued by: Mario Villar | 56 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|25.5 | Audit Results.If an audit by a Party determines
      that an overpayment or an underpayment has occurred, a notice of such
      overpayment or underpayment shall be given to the other Party together
      with those records from the audit which support such
  determination.
|---- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Article 26. Subcontractors

|26.1 | General.Nothing in this LGIA shall prevent a
      Party from utilizing the services of any subcontractor as it deems
      appropriate to perform its obligations under this LGIA; provided, however,
      that each Party shall                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|---- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|     | require its subcontractors to comply with all applicable
      terms and conditions of this LGIA in providing such services and each
      Party shall remain primarily liable to the other Party for the performance
      of such subcontractor.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|26.2 | Responsibility of Principal.The creation of any
      subcontract relationship shall not relieve the hiring Party of any of its
      obligations under this LGIA. The hiring Party shall be fully responsible
      to the other Party for the acts or omissions of any subcontractor the
      hiring Party hires as if no subcontract had been made; provided, however,
      that in no event shall Transmission Provider be liable for the actions or
      inactions of Interconnection Customer or its subcontractors with respect
      to obligations of Interconnection Customer under Article 5 of this LGIA.
      Any applicable obligation imposed by this LGIA upon the hiring Party shall
      be equally binding upon, and shall be construed as having application to,
      any subcontractor of such Party.
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|26.3 | No Limitation by Insurance.The obligations
      under this Article 26 will not be limited in any way byany
      limitation of subcontractor's insurance.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

Article 27. Disputes

|27.1 | Resolution.The Parties agree to attempt to
      resolve all disputes arising out of the interconnection process according
      to the provisions of this article.                                                                                                           
|---- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                               
|27.2 | Notice of Dispute.In the event of a
      dispute, either Party shall provide the other Party with a written Notice
      of Dispute. Such Notice shall describe in detail the nature of the
      dispute.                                                                   
|     |                                                                                                                                                                                                                                                                               
|27.3 | Informal Negotiations.The Parties shall first
      attempt in good faith to resolve any Dispute through informal negotiations
      by the operating representatives or contract representatives and senior
      management of each Party.                                  
|     |                                                                                                                                                                                                                                                                               
|27.4 | Arbitration or Mediation.In the event the Parties
      are unable to resolve the Dispute through informal negotiations as
      described above, the Parties may elect to pursue arbitration or mediation
      by any other method, i.e. mediation, chosen by the
  Parties.

|Issued by: Mario Villar | 57 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|**27.5** | Litigation.In the event the Parties are
      unable to satisfactorily resolve the Dispute within forty five (45) days
      from the receipt of notice of the Dispute, subject to any extensions of
      time as may be mutually agreed upon in writing, or any arbitration
      agreement, either Party may initiate litigation in a court of law with
      jurisdiction located in Las Vegas or Reno, Nevada, which shall be the
      exclusive venue to litigate disputes.
|-------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|**27.6** | Costs. Each Party shall be responsible
      for its own costs incurred during the litigation or during the alternative
      Dispute resolution procedures unless agreed to by both parties in writing.                                                                                                                                                                                                                                                                          

Article 28. Representations, Warranties, and
Covenants

|28.1 | General.Each Party makes the following
      representations, warranties and covenants:
|---- | ---------------------------------------------------------------------------------------

| | 28.1.1 | Good Standing.Such Party is duly
      organized, validly existing and in good standing under the laws of the
      state in which it is organized, formed, or incorporated, as applicable;
      that it is qualified to do business in the state or states in which the
      Large Generating Facility, Interconnection Facilities and Network Upgrades
      owned by such Party, as applicable, are located; and that it has the
      corporate power and authority to own its properties, to carry on its
      business as now being conducted and to enter into this LGIA and carry out
      the transactions contemplated hereby and perform and carry out all
      covenants and obligations on its part to be performed under and pursuant
      to this LGIA.
| | ------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
| | 28.1.2 | **Authority.**Such
      Party has the right, power and authority to enter into this LGIA, to
      become a Party hereto and to perform its obligations hereunder. This LGIA
      is a legal, valid and binding obligation of such Party, enforceable
      against such Party in accordance with its terms, except as the
      enforceability thereof may be limited by applicable bankruptcy,
      insolvency, reorganization or other similar laws affecting creditors'
      rights generally and by general equitable principles (regardless of
      whether enforceability is sought in a proceeding in equity or at law).                                                                                                                                       
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
| | 28.1.3 | No Conflict.The execution, delivery and
      performance of this LGIA does not violate or conflict with the
      organizational or formation documents, or bylaws or operating agreement,
      of such Party, or any judgment, license, permit, order, material agreement
      or instrument applicable to or binding upon such Party or any of its
      assets.                                                                                                                                                                                                                                                                                                                                                                                                       
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
| |        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
| | 28.1.4 | **Consent and Approval.**Such Party has sought or obtained, or, in accordance with this
      LGIA will seek or obtain, each consent, approval, authorization, order, or
      acceptance by any Governmental Authority in connection with the execution,
      delivery and performance of this LGIA, and it will provide to any
      Governmental Authority notice of any actions under this LGIA that are
      required by Applicable Laws and Regulations.                                                                                                                                                                                                                                                                                                            

|Issued by: Mario Villar | 58 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |    |                     
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Article 29. Joint Operating Committee

|29.1 | Joint Operating Committee.Except in the case of
      ISOs and RTOs, Transmission Provider shall constitute a Joint Operating
      Committee to coordinate operating and technical considerations of
      Interconnection Service. At least six (6) months prior to the expected
      Initial Synchronization Date, Interconnection Customer and Transmission
      Provider shall each appoint one representative and one alternate to the
      Joint Operating Committee. Each Interconnection Customer shall notify
      Transmission Provider of its appointment in writing. Such
    appointments                                                                                                                                                                                                                                                           
|---- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|     | may be changed at any time by similar notice. The Joint
      Operating Committee shall meet as necessary, but not less than once each
      calendar year, to carry out the duties set forth herein. The Joint
      Operating Committee shall hold a meeting at the request of either Party,
      at a time and place agreed upon by the representatives. The Joint
      Operating Committee shall perform all of its duties consistent with the
      provisions of this LGIA. Each Party shall cooperate in providing to the
      Joint Operating Committee all information required in the performance of
      the Joint Operating Committee's duties. All decisions and agreements, if
      any, made by the Joint Operating Committee, shall be evidenced in writing.
      The duties of the Joint Operating Committee shall include the
      following:

| | **29.1.1** | Establish data requirements and
      operating record requirements.                                                                                                                                                                                                                           
| | ---------- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |            |                                                                                                                                                                                                                                                                                                
| | **29.1.2** | Review the requirements, standards, and
      procedures for data acquisition equipment, protective equipment, and any
      other equipment or software.                                                                                                                                      
| |            |                                                                                                                                                                                                                                                                                                
| | **29.1.3** | Annually review the one (1) year
      forecast of maintenance and planned outage schedules of Transmission
      Provider's and Interconnection Customer's facilities at the Point of
      Interconnection.                                                                                  
| |            |                                                                                                                                                                                                                                                                                                
| | **29.1.4** | Coordinate the scheduling of maintenance
      and planned outages on the Interconnection Facilities, the Large
      Generating Facility and other facilities that impact the normal operation
      of the interconnection of the Large Generating Facility to the
      Transmission System.
| |            |                                                                                                                                                                                                                                                                                                
| | **29.1.5** | Ensure that information is being
      provided by each Party regarding equipment availability.                                                                                                                                                                                                
| |            |                                                                                                                                                                                                                                                                                                
| | **29.1.6** | Perform such other duties as may be
      conferred upon it by mutual agreement of the Parties.                                                                                                                                                                                                

Article 30. Miscellaneous

|30.1 | Binding Effect.This LGIA and the rights and
      obligations hereof, shall be binding upon and shall inure to the benefit
      of the successors and assigns of the Parties hereto.                                                                 
|---- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                       
|30.2 | Conflicts.In the event of a conflict between the
      body of this LGIA and any attachment, appendices or exhibits hereto, the
      terms and provisions of the body of this LGIA shall prevail and be deemed
      the final intent of the Parties.

|Issued by: Mario Villar | 59 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|30.3 | Rules of Interpretation.This LGIA, unless a clear
      contrary intention appears, shall be construed and interpreted as follows:
      (1) the singular number includes the plural number and vice versa; (2)
      reference to any person includes such person's successors and assigns but,
      in the case of a Party, only if such successors and assigns are permitted
      by this LGIA, and reference to a person in a particular capacity excludes
    such person in any other capacity or individually; (3) reference to any agreement (including this LGIA),
      document,instrument or tariff means such agreement, document, instrument,
      or tariff as amended or modified and in effect from time to time in
      accordance with the terms thereof and, it applicable, the terms
    hereof; (4) reference to any Applicable Laws and Regulations means
      such Applicable Laws and Regulations as amended, modified, codified, or
      reenacted, in whole or in part, and in effect from time to time,
      including, if applicable, rules and regulations promulgated
    thereunder; (5) unless expressly stated otherwise, reference to any
      Article, Section or Appendix means such Article of this LGIA or such
      Appendix to this LGIA, or such Section to the LGIP or such Appendix to the
    LGIP, as the case may be; (6) "hereunder", "hereof", "herein", "hereto" and words of similar import shall be deemed references to this LGIA as a whole and not to any particular Article or other provision hereof or thereof; (7) "including" (and with correlative meaning "include") means including without limiting the generality of any description preceding such term; and (8) relative to the determination of any period of time, "from" means "from and including", "to" means "to but excluding" and "through" means "through and including".
|---- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|30.4 | Entire Agreement.This LGIA, including all
      Appendices and Schedules attached hereto, constitutes the entire agreement
      between the Parties with reference to the subject matter hereof, and
      supersedes all prior and contemporaneous understandings or agreements,
      oral or written, between the Parties with respect to the subject matter of
      this LGIA. There are no other agreements, representations, warranties, or
      covenants which constitute any part of the consideration for, or any
      condition to, either Party's compliance with its obligations under this
      LGIA.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|30.5 | No Third Party Beneficiaries.This LGIA is not
      intended to and does not create rights, remedies, or benefits of any
      character whatsoever in favor of any persons, corporations, associations,
      or entities other than the Parties, and the obligations herein assumed are
      solely for the use and benefit of the Parties, their successors in
      interest and, where permitted, their assigns.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|30.6 | Waiver.The failure of a Party to this LGIA to
      insist, on any occasion, upon strict performance of any provision of this
      LGIA will not be considered a waiver of any obligation, right, or duty of,
      or imposed upon, such Party.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|     | Any waiver at any time by either Party of its rights with
      respect to this LGIA shall not be deemed a continuing waiver or a waiver
      with respect to any other failure to comply with any other obligation,
      right, duty of this LGIA. Termination or Default of this LGIA for any
      reason by Interconnection Customer shall not constitute a waiver of
      Interconnection Customer's legal rights to obtain an interconnection from
      Transmission Provider. Any waiver of this LGIA shall, if requested, be
      provided in writing.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

|Issued by: Mario Villar | 60 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|30.7  | Headings.The descriptive headings of the various
      Articles of this LGIA have been inserted for convenience of reference only
      and are of no significance in the interpretation or construction of this
      LGIA.                                                                                                                                                                                                                                                                                
|----- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|30.8  | Multiple Counterparts.This LGIA may be executed
      in two or more counterparts, each of which is deemed an original but all
      constitute one and the same instrument.                                                                                                                                                                                                                                                                                                                                
|      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|30.9  | Amendment.The Parties may by mutual agreement
      amend this LGIA by a written instrument duly executed by the
    Parties.                                                                                                                                                                                                                                                                                                                                                                               
|      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|30.10 | Modification by the Parties.The Parties may by
      mutual agreement amend the Appendices to this LGIA by a written instrument
      duly executed by the Parties. Such amendment shall become effective and a
      part of this LGIA upon satisfaction of all Applicable Laws and
      Regulations.                                                                                                                                                                                                     
|      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|30.11 | No Partnership.This LGIA shall not be interpreted
      or construed to create an association, joint venture, agency relationship,
      or partnership between the Parties or to impose any partnership obligation
      or partnership liability upon either Party. Neither Party shall have any
      right, power or authority to enter into any agreement or undertaking for,
      or act on behalf of, or to act as or be an agent or representative of, or
      to otherwise bind, the other Party.

|Issued by: Mario Villar | 61 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

IN WITNESS WHEREOF,the
Parties have executed this LGIA in duplicate originals, each of which shall
constitute and be an original effective Agreement between the Parties.

SIERRA PACIFIC POWER COMPANY

By:
    /s/ Mario VillarName:
    Mario VillarTitle:
    Transmission ExecutiveDate Signed:
    11/5/07NGP BLUE MOUNTAIN I LLCBy:
    /s/ Brian FairbankName:
    Brian
      FairbankTitle:
    Chief
      Executive OfficerDate Signed:
    Oct 30, 2007


Issued by: Mario Villar
    62
    Effective: 11/5/2007Executive, TransmissionIssued on:


---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Appendix A to LGIA

Interconnection Facilities, Network Upgrades and
Distribution Upgrades

NGP Blue Mountain 1 - 37.5 MW Phase One and 37.5 MW Phase
Two

|1. | Interconnection
Facilities:
|-- | ---------------------------

| | a. | Interconnection Customer's (IC) Interconnection
      Facilities:
| | -- | -----------------------------------------------------------------

- Permit and build approximately 19 miles of 120 kV transmission
  line from the NGP Blue Mountain 1 LLC - Faulkner 1 Generation site to
  the tap on the #162 line between Winnemucca Substation and Star
  Peak
- Coordinate with TP to secure permits for the Motor Operated
  Switching and Breaker Station location at the #162 line tap
- 120/13.8 kV step-up transformer
- Assist with permits for the Switching Station location at the
  #162 line tap
- Generating Facility real time telemeter outputs including: Watts, Vars,
  Volts, Amps, MWH, and Generator Breaker Status to Energy System Control
  Center (ESCC)
- Provide a ring down line from Generation facilities to ESCC at
  6100 Neil Rd. 3 ' floor that is specifically dedicated for TP's use
- Provide dial up line for meter (line can be shared with other
  control room phone lines)
- Primary substation station service power
- 24 V DC circuit dedicated to TP communication equipment
- 125 V DC Circuit to meter
- Meter Class PT's and CT's for new generation meter
- Generating Facility protection relays
- Area in generator control enclosure for TP's communications
  and/or metering equipment
- One 4-wire voice grade data line to new RTU
- Back up Generator for black start capability, outage and
  maintenance generation after commencing commercial operation
- Power System Stabilizer will be required to meet WECC operating
  standards

| | b. Transmission Provider's (TP) Interconnection Facilities
      In accordance with Article 4.1.1 and 4.1.2, Transmission Provider shall
      construct the Transmission Provider's Interconnection Facilities:
| | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

- One 120 kV breaker located adjacent to the #162 line tap
  switching station
- One ION revenue quality meter compensated to Point of
  Interconnection
- Provide specifications for Meter Class PT's and CT's for new
  generation meter
- An RTU at Generator's facility
- Miscellaneous Communication cables and link equipment
- Protection Engineering at & Coordination at IC Site

Appendix A - Page 1

|Issued by: Mario Villar | 63 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|2. | Network Upgrades:
|-- | -----------------

| | a. | Stand Alone Network Upgrades;
| | -- | -----------------------------

- Engineer and construct a Motor Operated Switching Station at
  #162 line tap
- Assist with permits for the Motor Operated Switching Station
  location at the #162 line tap
- Provide for communications link via radio to motor operated
  switch and new RTU to be located at the tap
- Protection Engineering at Winnemucca / Star Peak / Oreana
  Substations

| | b. | Other Network Upgrades: NONE
| | -- | ----------------------------

|3. | Phase 2 Upgrades:
|-- | -----------------

| | a. | Interconnection Customer's (IC) Interconnection
      Facilities:
| | -- | -----------------------------------------------------------------

- Same requirements as Phase One unless previously built
- Scope of Work will be updated prior to initiating Phase Two

| | b. | Transmission Provider's (TP) Interconnection
      Facilities:
| | -- | --------------------------------------------------------------

- One ION revenue quality meter compensated to Point of
  Interconnection
- Provide specifications for Meter Class PT's and CT's for new
  generation meter
- An RTU at Generator's facility
- Miscellaneous Communication cables and link equipment
- Protection Engineering at & Coordination at IC Site

|4. | Ownership:
|-- | ----------

Upon completion of construction, the
Parties shall have ownership of the facilities as follows:

| | a. | Interconnection Customer's Interconnection Facilities
      shall be owned by Interconnection Customer
| | -- | ------------------------------------------------------------------------------------------------------
| |    |                                                                                                       
| | b. | Transmission Providers' Interconnection Facilities
      shall be owned by Transmission Provider      

|5. | Cost Estimate &
  Responsibilities:
|-- | -----------------------------------

| | a. | Interconnection Customer's Interconnection Facilities:
      Interconnection Customer.
| | -- | --------------------------------------------------------------------------------------
| |    |                                                                                       
| | b. | Transmission Provider's Interconnection
  Facilities:                                 

Communications Plant Site
    $ 71,200Metering
    
    $ 63,200120 kV Breaker
    
    $ 574,000TOTAL
    $ 708,400 -
      Interconnection Customer


All costs will be trued to actual at the completion of the
Project

Appendix A - Page 2

|Issued by: Mario Villar | 64 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07.01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

| | c. | Network Upgrades: $785,800- At least thirty (30)
      Calendar Days prior to the commencement of the design procurement,
      installation, or construction of the Network Upgrades, Interconnection
      Customer shall provide Transmission Provider an Irrevocable Letter of
      Credit (LOC) for the entire estimate of the Network Upgrades. The
      Transmission Provider may cancel the LOC once the Large Generating
      facility achieves commercial operation for a period of 90 (ninety)
      calendar days and Interconnection Customer has satisfied all financial
      obligations to Transmission Provider. If the Large Generating Facility
      fails to achieve commercial operation within three years of the completion
      of construction of the Network Upgrade Facilities the Transmission
      Provider may call on the LOC for reimbursement of the Network
    Upgrades.
| | -- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Protection @ Oreana & Winnemucca
    $ 250,000Blue Mountain Switching Station
    $ 341,500Permitting Switching Station
    $ 123,000Communications at WO Switch
    $ 71,300TOTAL
    $ 785,800 --Transmission Provider


d. Phase 2 Transmission Provider's
Interconnection Facilities:

Communications
      $41,500Metering
      $63,200TOTAL
      $ 104,700 -Interconnection Customer


Estimated Cost&Scope of Work
will be updated prior to initiating Phase Two

All costs will be trued to actual
at the completion of the Project



| | 6. Operation and Maintenance Responsibilities:                                                                                                                 
| | ---------------------------------------------------------------------------------------------------------------------------------------------------------------
| | Each Party's responsibilities for operation and
      maintenance of the Interconnection Facilities, Network Upgrades and
      Distribution Upgrades shall be:
| |                                                                                                                                                                
| | Upon completion of construction, the Parties shall have
      responsibilities for operation and maintenance of the facilities as
      follows:               

| | a. | Interconnection Customer's Interconnection Facilities
      shall be operated and maintained by Interconnection Customer
| | -- | ------------------------------------------------------------------------------------------------------------------------
| |    |                                                                                                                         
| | b. | Transmission Providers' Interconnection Facilities
      shall be operated and maintained by Transmission
  Provider    

Annual O&M Expenses -
TBD

7.Repair and/or Replacements

The responsibility for cost of
replacement facilities shall be as follows:

| | a. | Interconnection Customer's Interconnection Facilities:
      Interconnection Customer.
| | -- | --------------------------------------------------------------------------------------
| |    |                                                                                       
| | b. | Transmission Provider's Interconnection Facilities:
      Interconnection Customer.   

Appendix A - Page 3



|Issued by: Mario Villar | 65 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |    |                     
|Issued on:              |    |                     

---



|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

|8. | Project Cost Projections of Facilities as described in
      Appendix A
|-- | -----------------------------------------------------------------------

LGIA
    
    Payment Date (invoice to be sent 30 days prior)NGP Blue Mountain I LLC
    Total
    **Due At Contract
      Execution**
    **01/01/08**
    **04/01/08**
    **07/01/08**
    **10/01/08**
    **01/01/09**
    **04/01/09****Transmission Provider's Additions**
    $ 708,400
    $ 60,000
    $10,000
    $40,500
    $35,000
    $156,300
    $350,000
    $56,600Accumulated Total
    
    $60,000
    $70,000
    $110,500
    $145,500
    $301,800
    $651,800
    $708,400**Irrevocable Letter of Credit**
    **$785,800**
    $785,800
    ** Letter if
      Credit Due 3/1/2008Estimated In-Service:
    7/1/2009Commercial Operation
    12/15/2009Estimated Costs will be trued to Actual following
      Construction


Appendix A - Page 4



|Issued by: Mario Villar | 66 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |    |                     
|Issued on:              |    |                     

---



|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

A p p e n d i x   B   t o L G I A

M i l e s t o n e s

In-Service Date: 7/1/2009

**NGP Blue Mountain 1 - 37.5 MW Phase
One**

Critical milestones and responsibility for Phase 1 as agreed to
by the Parties:

Generator Interconnection Facilities ("IC or
      Generator")Initiate application for telecom or alternate type of
      communications service
    1/1/2008Project Initiation and Confirmation Mtg. (TP and ICM
    3/1/2008Provide Irrevocable Letter of Credit for Network Upgrades to
      TP
    3/1/2008Permits acquired for Circuit Breaker and Transmission Line
    6/1/2008Provide TP operation plan for generator start up
    8/1/2008Provide Modified One-line with Scheme Descriptions and Relay
      Settings to TP
    10/1/2008Provide Transformer nameplate and testing data to TP
    5/1/2009Control room complete
    6/1/2009Provide 24 V DC power (max 5 amp) for TP communications
      equipment
    6/1/2009Provide 125 V DC power for meter
    6/1/2009Provide dial up line for meter
    6/1/2009Meter
      Pad complete
    6/1/2009Provide Ring Down line from Generator Control Room ESCC
    6/1/2009Complete construction of - 19 miles of 120 kV Transmission
      Line
    6/1/2009Generator Facility protection relays complete
    6/1/2009PT's
      and CT's for new generation generation meter installation complete
    6/1/2009Generator Interconnection Facilities completed by
    6/13/2009Backfeed Power Required
    7/1/2009Commercial Testing Start Date (written notice provided to TP 1
      week prior)
    10/1/2009Facility Trip Testing
    11/15/2009Commercial Operation Date (written notice provided to TP 1
      week prior)
    12/15/2009


Appendix B -- Page 1

|Issued by: Mario Villar | 67 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

**NGP Blue Mountain 1 - 37.5 MW Phase One**

Critical milestones and responsibility for Phase 1 as agreed to
by the Parties:

Transmission Provider Interconnection
      Facilities ("TP")TP
      received initial payment for LGIA
    11/1/2007Begin
      coordinationwith IC to help secure with permit for M/0 Switch
    11/1/2007Project Initiation and Confirmation Mtg. )TP and IC)
    3/1/2008Switchyard Design Completed
    6/1/2008Begin
      Metering Design and Procurement
    8/1/2008Providespecifications for Meter Class PT's and CT's
      for new generation meter
    10/1/2008Protection and Control Design Complete at TP substation sites
    12/1/2008Communications Complete for IC's generation site
    6/1/2008Communications Complete on TPs transmission system
    6/19/2009Communications radio link to MO switch and new RTO at tap
      complete
    6/19/2009Engineering & construction of MO Switching
      Station at #162 line tap complete
    6/19/2009Protection and Controls Complete for IC site
    6/26/2009Metering and meter testing Complete
    6/26/2009Energize facilities for Construction Power
    7/1/2009Commercial Testing Data
    10/1/2009Commercial Operation Data
    12/15/2009


Critical milestones and responsibility for Phase 2 will need an
amendment as agreed to by the Parties prior to commencement of construction.
Phase Two must commence the work required under this LGIA on or before the
expiration of three (3) years following Commercial Operation Date of Phase
One.

Agreed to by:

|For the Transmission Provider    | /s/                |  | Date 11/5/2007    
|-------------------------------- | ------------------ |  | ------------------
|                                 |                    |  |                   
|For the Interconnection Customer | /s/ Brian Fairbank |  | Date Oct. 30, 2007

Appendix B - Page 2

|Issued by: Mario Villar | 68 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |    |                     
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Appendix C to LGIA

Interconnection Details

Type of Interconnection Service: Network
Resource

NGP Blue Mountain 1 - 
Generating Facility
Capacity: 37.5 MW Phase 1 & 37.5 MW Phase 2

Point of Interconnection:The Point of
Interconnection will be at the point where: Interconnection Customer's
Generating Facility connects to the Transmission System utilizing the
Interconnection Facilities. Point of Interconnection shall be where the newly
constructed Interconnection Customer's 120 kV line from Faulkner 1 Geothermal
facility intersects the #162 line between the Winnemucca Substation and the Star
Peak Switching station. See Drawing A-1.

Point of Ownership:The Point of Ownership will be
the point where: Point of Ownership shall be one span outside the Transmission
Company's newly installed motor operated switch on the Interconnect Company's
side. The switch will tap the #162 line between Winnemucca Substation and Star
Peak Switching station at approximately 20 miles from the Winnemucca
Substation.

One Line - next page

Appendix C - Page 1

|Issued by: Mario Villar | 69 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |    |                     
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              




|Issued by: Mario Villar | 70 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Appendix D to LGIA

Security Arrangements Details

Infrastructure security of Transmission System equipment and
operations and control hardware and software is essential to ensure day-to-day
Transmission System reliability and operational security. FERC will expect all
Transmission Providers, market participants, and Interconnection Customers
interconnected to the Transmission System to comply with the recommendations
offered by the President's Critical Infrastructure Protection Board and,
eventually, best practice recommendations from the electric reliability
authority. All public utilities will be expected to meet basic standards for
system infrastructure and operational security, including physical, operational,
and cyber-security practices.

|Issued by: Mario Villar | 71 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Appendix E to LGIA

Commercial Operation Date

This notice must be sent to Transmission Provider on TWOoccasions. One week prior to commercial testing and one week prior to commercial
operation.

Date

Chris TomchukSierra Pacific Power
CompanyManager, Transmission Business Development & Contracts6100
Neil RdReno, NV 89520

Re: NGP Blue Mountain I LLC

Dear Chris:

On __Date plus one weekNevada Geothermal Power Inc. - Faulkner 1 will commence Testing of the
generators located at the Blue Mountain facility.

OR

On ____Date plus one
week______Nevada Geothermal Power Inc. - Faulkner 1 will
commence Commercial Operation of the generators located at the Blue Mountain
facility.

Thank you.

Max Walenciak, P.E.Manager, NGP
Blue Mountain I LLC

|Issued by: Mario Villar | 72 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Appendix F to LGIA

Addresses for Delivery of Notices and Billings

Notices:

General

Unless otherwise provided in this
Agreement, any written notice, demand, or request required or authorized in
connection with this Agreement ("Notice") shall be deemed properly given if
delivered in person, delivered by recognized national currier service, or sent
by first class mail, postage prepaid, to the person specified below:

Interconnection Customer:

Interconnection Customer: _____NGP
Blue Mountain I LLCAttention: Max
Walenciak____________________________Address:___ 1755 East Plumb
Lane, Suite 220__________City: ______ Reno___ State: __
NV_____ Zip: ___89502Phone: (775)786-3399 Fax:
(775)786-3394E-mail:
max@nevadageothermal.com

Transmission Provider:

Transmission Provider: Sierra
Pacific Power CompanyAttention: ________Chris Tomchuk_____________________Manager, Transmission Business Development &
ContractsAddress: 6100 Neil Rd_ OR P.O. Box
10100__________City: ______ Reno________ State: ___ NV____
Zip: 89520Phone: (775)834-5876 Fax: (775)834-3050E-mail: ctomchuk@sppc.com

Billing and Payment:

Billings and payments shall be sent to
the addresses set out below:

Interconnection Customer: _____NGP
Blue Mountain I LLCAttention: Max
Walenciak____________________________Address:___ 1755 East Plumb
Lane, Suite 220__________City: ______ Reno___ State: __
NV_____ Zip: ___89502Phone: (775)786-3399 Fax:
(775)786-3394E-mail:
max@nevadageothermal.com

Transmission Provider: Sierra
Pacific Power CompanyAttention: Pat Englin, Manager Transmission
ServicesAddress: 6100 Neil Rd_ OR P.O. Box
10100__________City: ______ Reno________ State: ___ NV____
Zip: 89520Phone: (775)834-5877 Fax: (775)834-5462E-mail: penglin@sppc.com



Appendix F - Page 1

|Issued by: Mario Villar | 73 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---



|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Alternative Forms of Notice

Any notice or request required or
permitted to be given by either Party to the other and not required by this
Agreement to be given in writing may be so given by telephone, facsimile or
e-mail to the telephone numbers and e-mail addresses set out below:

Interconnection Customer:

Interconnection Customer: ____ NGP
Blue Mountain I LLCAttention: Max Walenciak_____________________________Address: ___ 1755 East Plumb Lane, Suite
220__________City: ______ Reno__ State:___ NV____ Zip: ___
89502
Phone: (775)786-3399 Fax: (775)786-3394E-mail: max@nevadageothermal.com

Transmission Provider:

Transmission Provider: Sierra
Pacific Power CompanyAttention: Renee Hull, Business Development
ExecutiveAddress: 6100 Neil Rd_ OR P.O. Box
10100__________City: ______Reno________State:___ NV____
Zip: 89520Phone: (775)834-5441 Fax: (775)834-3047E-mail: rhull@sppc.com

Designated Operating Representative

The Parties may also designate
operating representatives to conduct the communications which may be necessary
or convenient for the administration of this Agreement. This person will also
serve as the point of contact with respect to operations and maintenance of the
Party's facilities.

Interconnection Customer's Operating
Representative:

Interconnection Customer: ____ NGP
Blue Mountain I LLCAttention: Max Walenciak_____________________________Address: ___ 1755 East Plumb Lane, Suite
220__________City: ______Reno__ State:___ NV____ Zip: ___
89502Phone: (775)786-3399 Fax: (775)786-3394E-mail: max@nevadageothermal.com

Transmission Provider's Operating
Representative:

Transmission Provider: Sierra
Pacific Power Company/Nevada Power CompanyAttention: Rich Salgo,
Director Electric System Control OperationsMailing Address: P.O. Box
10100 Reno, NV 89520-0024Street Address: 6100 Neil Rd. Reno, NV
89520___________________Phone: (775)834-5874 Fax:
(775)834-3940E-mail:
rsalgo@sppc.com

Changes to the Notice Information

Either Party may change this
information by giving five Business Days written notice prior to the effective
date of the change.

Appendix F - Page 2

|Issued by: Mario Villar | 74 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |    |                     
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

Appendix H to LGIA

Reliability Management System

|1. | Definitions:
|-- | ------------

| | **1.1** | **Member:**Any party to the WECC
    Agreement.                                                                                                                                                                                                                   
| | ------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |         |                                                                                                                                                                                                                                                                   
| | 1.2     | Reliability Management System or RMS: The
      contractual reliability management program implemented through the WECC
      Reliability Criteria Agreement, Section 2 of this Appendix G, and any
      similar contractual arrangement.                        
| |         |                                                                                                                                                                                                                                                                   
| | 1.3     | Western Interconnection:The area comprising those
      states and provinces, or portions thereof, in Western Canada, Northern
      Mexico and the Western United States in which Members of the WECC operate
      synchronously connected transmission systems.
| |         |                                                                                                                                                                                                                                                                   
| | 1.4     | WECC:The Western Electricity Coordinating Council
      or any successor entity.                                                                                                                                                                                  
| |         |                                                                                                                                                                                                                                                                   
| | 1.5     | WECC Agreement:The Western Electricity
      Coordinating Council Agreement dated March 20, 1967, as such may be
      amended from time to time.                                                                                                                 
| |         |                                                                                                                                                                                                                                                                   
| | 1.6     | WECC Reliability Criteria Agreement:The Western
      Electricity Coordinating Council Reliability Criteria Agreement among the
      WECC and certain of its member Transmission Providers, as such may be
      amended from time to time.                      
| |         |                                                                                                                                                                                                                                                                   
| | 1.7     | WECC Staff:Those employees of the WECC, including
      personnel hired by the WECC on a contract basis, designated as responsible
      for the administration of the RMS.                                                                                       

|2. | Terms and Conditions
|-- | --------------------

| | 2.1 | Purpose.In order to maintain the reliable
      operation of the transmission grid, the WECC Reliability Criteria
      Agreement sets forth reliability criteria adopted by the WECC to which
      Interconnection Customer and Transmission Provider shall be required to
      comply.                                                                                                                                                                                                                                                                                                                                                           
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
| | 2.2 | Compliance.Interconnection Customer shall comply
      with the requirements of the WECC Reliability Criteria Agreement,
      including the applicable WECC reliability criteria set forth in Section IV
      of Annex A thereof, and, in the event of failure to comply, agrees to be
      subject to the sanctions applicable to such failure. Such sanctions shall
      be assessed pursuant to the procedures contained in the WECC Reliability
      Criteria Agreement. Each and all of the provisions of the WECC Reliability
      Criteria Agreement are hereby incorporated by reference into this Appendix
      G as though set forth

|Issued by: Mario Villar | 75 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

fully herein, and Interconnection
Customer shall for all purposes be considered a Participant, and shall be
entitled to all of the rights and privileges and be subject to all of the
obligations of a Participant, under and in connection with the WECC Reliability
Criteria Agreement, including but not limited to the rights, privileges and
obligations set forth in Sections 5, 6 and 10 of the WECC Reliability Criteria
Agreement.

| | 2.3 | Payment and Sanctions.Interconnection Customer
      shall be responsible for reimbursing Transmission Provider for any
      monetary sanctions assessed against Transmission Provider due to the
      action or inaction of Interconnection Customer, by WECC pursuant to the
      WECC Reliability Criteria Agreement. Interconnection Customer also shall
      be responsible for payment of any monetary sanction assessed against
      Interconnection Customer by WECC pursuant to the WECC Reliability Criteria
      Agreement. Any such payment shall be made pursuant to the procedures
      specified in the WECC Reliability Criteria Agreement.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
| | 2.4 | Transfer of Control or Sale of Generation Facilities.In any sale or transfer of control of any generation facilities
      subject to this Appendix G, Interconnection Customer shall as a condition
      of such sale or transfer require the acquiring party or transferee with
      respect to the transferred facilities either to assume the obligations of
      Interconnection Customer with respect to this Appendix G or to enter into
      an agreement with Transmission Provider imposing on the acquiring party or
      transferee the same obligations applicable to Interconnection Customer
      pursuant to this Appendix G.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
| |     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
| | 2.5 | Publication.Interconnection Customer consents to
      the release by the WECC of information related to Interconnection
      Customer's compliance with this Appendix G only in accordance with the
      WECC Reliability Criteria Agreement.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
| |     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
| | 2.6 | Third Parties. Except for the rights and
      obligations between the WECC and Interconnection Customer specified in
      this Appendix G, this Appendix G creates contractual rights and
      obligations solely between the Parties. Nothing in this Agreement shall
      create, as between the Parties or with respect to the WECC: (a) any
      obligation or liability whatsoever (other than as expressly provided in
      this Appendix G), or (b) any duty or standard of care whatsoever. In
      addition, nothing in this Appendix G shall create any duty, liability, or
      standard of care whatsoever as to any other party. Except for the rights,
      as a third-party beneficiary under this Appendix G, of the WECC against
      Interconnection Customer, no third party shall have any rights whatsoever
      with respect to enforcement of any provision of this Appendix G.
      Transmission Provider and Interconnection Customer expressly intend that
      the WECC is a third- party beneficiary to this Appendix G, and the WECC
      shall have the right to seek to enforce against Interconnection Customer
      any provision of this Appendix G, provided that specific performance shall
      be the sole remedy

|Issued by: Mario Villar | 76 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---

|Sierra Pacific Resources Operating Companies |                              
|-------------------------------------------- | -----------------------------
|FERC Electric Tariff                         | Service Agreement No.07-01534
|Third Revised Volume No. 1                   |                              
|Open Access Transmission Tariff              |                              

available to the WECC pursuant to this
Appendix G, and Interconnection Customer shall not be liable to the WECC
pursuant to this Appendix G for damages of any kind whatsoever (other than the
payment of sanctions to the WECC, if so construed), whether direct,
compensatory, special, indirect, consequential, or punitive.

| | 2.7 | Reserved Rights.Nothing in the RMS or the WECC
      Reliability Criteria Agreement shall affect the right of Transmission
      Provider, subject to any necessary regulatory approval, to take such other
      measures to maintain reliability, including disconnection, that
      Transmission Provider may otherwise be entitled to take.
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |     |                                                                                                                                                                                                                                                                                                                                                 
| | 2.8 | Severability.If one or more provisions of this
      Appendix G shall be invalid, illegal or unenforceable in any respect, it
      shall be given effect to the extent permitted by applicable law, and such
      invalidity, illegality or unenforceability shall not affect the validity
      of the other provisions of this Agreement.   
| |     |                                                                                                                                                                                                                                                                                                                                                 
| | 2.9 | Termination.Interconnection Customer may
      terminate its obligations pursuant to this Appendix
G:                                                                                                                                                                                                                                           

| |  | (a) | If after the effective date of this Appendix G, the
      requirements of the WECC Reliability Criteria Agreement applicable to
      Interconnection Customer are amended so as to adversely affect
      Interconnection Customer, provided that Interconnection Customer gives
      fifteen (15) Calendar Days' notice of such termination to Transmission
      Provider and WECC within forty-five (45) Calendar Days of the date of
      issuance of a Commission order accepting such amendment for filing,
      provided further that the forty-five (45) day period within which notice
      of termination is required may be extended by Interconnection Customer for
      an additional forty-five (45) Calendar days if Interconnection Customer
      gives written notice to Transmission Provider of such requested extension
      within the initial forty-five {45) day period; or
| |  | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |  |     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
| |  | (b) | For any reason on one year's written notice to
      Transmission Provider and the WECC.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

|2.10 | Mutual Agreement.This Appendix G may be
      terminated at any time by mutual agreement of Transmission Provider and
      Interconnection Customer.
|---- | -----------------------------------------------------------------------------------------------------------------------------------------------------

|Issued by: Mario Villar | 77 | Effective: 11/5/2007
|----------------------- | -- | --------------------
|Executive, Transmission |   
|Issued on:              |    |                     

---