<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

A.       SCOPE OF WORK

   1.0   PROJECT OVERVIEW AND SITE DESCRIPTION
   2.0   SCOPE OF RESPONSIBILITIES

         2.1  Project Management
         2.2  Technical Data
         2.3  Procurement
         2.4  Construction
         2.5  Commissioning and Performance Verification

   3.0   SCOPE OF FACILITIES

         3.1  Power Block
         3.2  Balance of Plant Systems
         3.3  Electrical Systems
         3.4  Plant Control System
         3.5  Utility Systems
         3.6  Buildings and Roads
         3.7  Temporary Construction Utilities
         3.8  Lubrications / Oils / Chemical / Gases

B.       PERFORMANCE GUARANTEES AND VERIFICATION PROCEDURES

   1.0   PURPOSE
   2.0   PLANT PERFORMANCE TESTS

         2.1  Performance Guarantees
         2.2  Performance Bonus
         2.3  Electrical Output
         2.4  Heat Rate
         2.5  Auxiliary Loads
         2.6  Guaranteed Performance Conditions for Electrical Output and Heat
         Rate
         2.7  Conduct of Verification
         2.8  Verification Procedures
         2.9  Acceptance Criteria
         2.10 Deadband Applied to Performance Guarantees

Exhibit A                                                               10-13-04

                                  Page 1 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

         2.11 Deadband Applied to Performance Bonus

   3.0   THREE DAY RELIABILITY TEST

         3.1  Reliability Test
         3.2  Reliability Factor
         3.3  Acceptance Criteria

   4.0   ENVIRONMENTAL COMPLIANCE

         4.1  Compliance Tests

   5.0   UTILITY ACCEPTANCE TESTS

C.       TRAINING PROCEDURES

   1.0   PURPOSE
   2.0   OPERATOR TRAINING BY CONTRACTOR
   3.0   OPERATOR TRAINING BY OWNER

D.       FACILITY ASSESSMENT

   1.0   PURPOSE

E.       ATTACHMENTS

   1.0   SITE PLAN AND PLOT PLAN
   2.0   PROCESS FLOW DIAGRAMS AND P&IDS
   3.0   EQUIPMENT LIST
   4.0   ELECTRICAL ONE-LINE DIAGRAMS
   5.0   FIRE PROTECTION DESIGN CRITERIA
   6.0   RAW (WELL) WATER ANALYSIS
   7.0   PERFORMANCE VERIFICATION PLAN
   8.0   PERFORMANCE FUEL - NATURAL GAS ANALYSIS
   9.0   STRUCTURAL DESIGN CRITERIA
   10.0  ELECTRICAL DESIGN CRITERIA
   11.0  WATER SYSTEMS DESIGN CRITERIA
   12.0  BUILDING PLANS
   13.0  INTERFACE PLAN (OWNER/CONTRACTOR INTERFACE POINTS)
   14.0  ASSESSMENT EFFORT
   15.0  LIST OF MATERIAL AT SITE

Exhibit A                                                               10-13-04

                                  Page 2 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

   16.0  PLANT MANUAL
   17.0  AUXILIARY LOAD LIST (PERFORMANCE GUARANTEE / PERFORMANCE BONUS)
   18.0  AIR PERMIT (AUTHORITY TO CONSTRUCT)

Exhibit A                                                               10-13-04

                                  Page 3 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

A.          SCOPE OF WORK

1.0         PROJECT OVERVIEW AND SITE DESCRIPTION

            The project consists of engineering, procurement, construction and
            commissioning a combined cycle power plant producing a nominal 1,160
            MW. The Facility design is a four-on-two combined cycle
            configuration utilizing four (4) GE 160 MW F-class advanced
            combustion turbine generators (CTG) with inlet air chillers, four
            heat recovery steam generators (HRSGs) with duct burners, and two
            (2) GE 300 MW steam turbine generators (STG). The steam turbine
            exhaust shall be condensed in an air-cooled condenser. The Site Plan
            and Plot Plan are included as Attachment 1. General Facility
            overview is reflected in the Process Flow Diagrams included as
            Attachment 2 and the electrical One-Line Diagrams included as
            Attachment 4. Major mechanical equipment is listed in the Equipment
            List included as Attachment 3. The 4 x 2 Facility will be designed
            to operate as two separate 2 x 1 Power Blocks.

            The above information is included to establish the basis for the
            Scope of Work. It is intended to be a representation of the general
            requirements for the facilities. The Approved for Construction
            information shall incorporate details developed during the
            engineering and design effort and may differ from the information
            presented in the general requirements.

            Power shall be exported through a 525 kilovolt transmission system
            into the existing grid. The new plant transmission lines shall be
            contracted separately by Owner to accommodate the export of the
            generated power.

            Process make-up water shall be supplied from two water wells. The
            effluent streams from the Facility shall be routed to the
            evaporation ponds, thus affecting a zero-water discharge.

            The Facility shall operate within the ambient design conditions of
            8 degrees F through 116 degrees F. The Facility design conditions
            shall be 31 degrees F through 104 degrees F (99% ASHRAE dry bulb
            temperature and 2% ASHRAE dry bulb temperature respectively).

            This new Facility shall be located on 100 acres of property in Clark
            County, north of Apex, Nevada. The project site is described in
            Exhibit B, Site Description.

2.0         SCOPE OF RESPONSIBILITIES

2.1         Project Management

Exhibit A                                                               10-13-04

                                  Page 4 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            Contractor shall provide the necessary personnel and systems to
            plan, control, execute, monitor and report project progress in terms
            of schedule, scope and cost changes.

2.1.1       Scheduling

            Within 30 Days after the Effective Date of this Agreement,
            Contractor shall deliver to Owner a Level III detailed CPM Project
            Schedule indicating all work to be performed by Contractor. This
            Schedule shall contain milestones and include details to support all
            major construction, commissioning and testing activities. This
            Schedule shall form the basis for progress reporting through the
            course of the project and shall be submitted in accordance with the
            scheduling and reporting requirements as set forth in the Agreement
            Exhibit C-2.

            Owner shall have the right to review and comment on the Schedule as
            allowed in Exhibit C-2.

2.1.2       Reporting

            Contractor shall issue monthly progress reports (status reports) as
            required in the Agreement and more fully described in Exhibit J.

2.1.3       Change Control

            Contractor shall implement and maintain an effective program to
            identify changes in project scope and to develop and report schedule
            and cost impact of changes. The change control program shall
            function in accordance with the Agreement.

2.2         Technical Data

            Contractor shall develop the technical data, including drawings,
            equipment lists and specifications, necessary to procure materials
            and equipment, construct permanent facilities, install equipment and
            materials, and verify the Facility.

2.2.1       Technical Documents

            To the extent not completed as a part of the Prior Work, Contractor
            shall complete development of and maintain updates of the following
            technical documents for procurement of materials and equipment and
            construction of the Facility, necessary for operation and
            maintenance of the Facility as follows.

Exhibit A                                                               10-13-04

                                  Page 5 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            ENGINEERING AND CONSTRUCTION SPECIFICATIONS

            Site preparation, underground pipe, underground electrical,
            excavation, foundations and concrete structures, structural steel
            and buildings
            Mechanical equipment
            Piping supply, fabrication and installation
            Electrical material and equipment installation
            Instrumentation, and plant control and monitoring systems
            Paint, insulation and coatings

            DRAWINGS

            Process Flow Diagrams
            Electrical physical drawings
            Piping and Instrumentation Diagrams
            Overall Site Plan and Plot Plan(s)
            Grading and paving drawings
            Foundation drawings
            Structural steel general arrangement drawings
            Building plans and elevations
            Piping composite drawings and isometrics
            Electrical One-Line Diagrams, schematics and physical drawings
            Construction Temporary Facilities Layout

            LISTS, INDEXES, AND SCHEDULES (EACH AS AN ELECTRONIC DATABASE)

            Piping Line List
            Drawing Index
            Mechanical Equipment List
            Piping Specialty Items
            Electrical Equipment List
            Electrical Load List
            Cable Schedules
            Instrumentation Index

2.2.2       Contractor shall provide Owner or its designee access to technical
            documents including vendor drawings, specifications and data through
            an electronic interface specifically set up for Owner's use.

2.2.3       Owner or its designee shall have the right to review and comment on
            design documents that will be completed by Contractor during the
            course of the Agreement, provided however, any comments made by
            Owner with regard to Prior Work, shall be considered as a Change
            Order.

Exhibit A                                                               10-13-04

                                  Page 6 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            Owner shall have the right to place Owner's representatives in
            Contractor's design office in Houston, Texas, to review the
            documents.

            Contractor shall review comments received from Owner. If Contractor
            agrees with Owner's comments, then Contractor shall incorporate the
            comments into the design. If Contractor does not agree with
            comments, then Contractor shall respond in writing within ten (10)
            Business Days with reasons for not incorporating comments.

2.2.4       Contractor shall provide Owner or its designee with the following
            documents for review and approval to the extent not provided as part
            of the Prior Work. Owner approval only applies to the initial issue
            of the drawings and ECN's. Owner shall receive all issues of the
            drawings and ECN's.

            -     Site Plan & Plot Plan

            -     Architectural Drawings

            -     Architectural Finishes

            -     Process Flow Diagrams

            -     Piping and Instrumentation Diagrams

            -     Interface Drawings / Details

            -     Plant Manuals

            -     Control System Narratives (as part of systems description)

            -     Facility test procedures

2.2.5       Facility Interconnect

            Contractor shall provide assistance to Owner, as is reasonably
            requested, in negotiating/coordinating with local utilities and/or
            governmental bodies in any and all matters relating to interface and
            interconnection of the Facility.

2.2.6       Units of Measure and Language

            The Contractor shall use the English System of Units (feet, inches,
            pounds, etc.) for all units of measure. All drawings, including
            drawings for equipment based on the metric system shall include the
            English System of Units equivalent dimension.

            All documents developed and supplied to the Owner shall be in
            English.

Exhibit A                                                               10-13-04

                                  Page 7 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

2.2.7       As-Built Documents

            Contractor shall revise the following drawings and technical
            documents to reflect the As-Built conditions and shall deliver
            As-Built drawings and technical documents to Owner or its designee.

            -     Process Flow Diagrams

            -     Piping and Instrumentation Diagrams (P&IDs)

            -     Electrical One-Line Diagrams

            -     Underground Piping Drawings

            -     Underground Electrical Drawings

            -     Connection Diagrams

            -     Termination Schedule (Engineering Database)

            -     Equipment List (Engineering Database)

            -     Electrical Load List (Engineering Database)

            -     Instrument List (Engineering Database)

            -     Piping Line List (Engineering Database)

            Two (2) redline marked-up hardcopies of the above drawings, and an
            electronic update of the engineering database shall be furnished to
            Owner or its designee at Substantial Completion of each Power Block
            to document and convey changes made during construction,
            commissioning testing and verification. The above As-Built drawings
            or electronic database incorporating these changes shall be
            furnished after Substantial Completion and prior to Final
            Completion.

2.2.8       Plant Manuals

            Contractor shall provide Plant Manuals as required in the Agreement
            and more fully described in Attachment 16. The Final Plant Manuals
            shall be provided in hardcopy and CD-ROM formats (2 hardcopies and 3
            copies of CDs). The initial issue of manuals shall be provided in
            hard copy format by January 15, 2005. Copies of the As Built mark
            ups will be provided at Substantial Completion of each Power Block.
            Supplements and revisions shall be issued for the hardcopies prior
            to Final Completion to incorporate information received after the
            initial issue. Final Plant Manuals in CD format shall be provided to
            Owner prior to Final Completion.

2.2.9       Operation Manuals

Exhibit A                                                               10-13-04

                                  Page 8 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            Owner shall provide Contractor with 2 copies of the Operation
            Manuals in hardcopy format in accordance with the Schedule.

            Contractor shall support Owner's development of Operations Manuals
            describing the step-by-step procedures for operation and maintenance
            of Facility. As Built mark ups will be provided at Substantial
            Completion of each Power Block. Contractor shall review Operations
            Manual for completeness, field changes, clarification and
            modification impacting the operation and maintenance of Facility.

2.3         Procurement

            Contractor shall procure all remaining materials, equipment, and
            services necessary to complete the Facility described in Section 3 -
            Scope of Facilities. Contractor shall provide Owner access to
            un-priced copies of Subcontractor purchase orders entered into as a
            part of the Work, provided however, Contractor shall not be required
            to provide copies of purchase orders resulting from Prior Work.

2.3.1       Spare Parts

            During the Facility Assessment, Contractor will identify all Owner
            Equipment and Major Equipment start up and commissioning spare parts
            that are available at Site.

            Contractor shall determine any additional spares required for start
            up and commissioning and shall be responsible for purchase of these
            spare parts.

            For Contractor-Supplied Equipment, Contractor shall obtain O&M spare
            parts quotations from all such Subcontractors and forward to Owner
            within 180 days of the Notice to Proceed date, or as the information
            is received from the Subcontractors (whichever is earlier).

            Contractor shall provide to Owner lists of vendor recommended
            mechanical, electrical and instrument spare parts previously
            received as Prior Work for operation of the Facility including Major
            Equipment and Owner Equipment.

            Contractor may use available Owner's O&M spare parts as required
            during the Commissioning and/or Warranty Period with Owner's written
            approval. Contractor shall be responsible for payment and
            replacement of any Owner-supplied spare parts used by Contractor and
            Contractor shall place a purchase order within 7 Days for the
            replacement spare parts.

Exhibit A                                                               10-13-04

                                  Page 9 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

2.3.2       Expediting

            Contractor shall expedite engineering information, material and
            equipment deliveries for items required to complete the Facility.

2.4         Construction

            Contractor shall provide construction services through use of
            Contractor's resources and/or through Subcontractors. Services
            include labor, supervision, construction equipment, tools, installed
            and consumable materials, material receiving, handling, and storage,
            field erection, installation, construction testing and verification
            necessary to provide the Facilities described in Section 3 - Scope
            of Facilities.

2.4.1       Contractor's construction management staff shall manage construction
            of the project using a closed-shop approach for construction and
            installation of the Facility. The construction management staff
            shall include a Site Manager, site engineering staff, contract
            administration staff, project controls, construction specialists,
            safety, environmental and quality control personnel to adequately
            manage construction.

2.4.2       Contractor shall develop and implement an on site fire protection
            plan for the duration of the construction effort. The Contractor's
            safety plan shall be in accordance with Exhibit Q.

2.4.3       Contractor shall develop, implement and follow a project specific
            environmental plan that shall include provisions to control erosion
            and sedimentation, plans to handle contaminated soil and water
            encountered during construction, and spill prevention and
            countermeasure control. Such plan shall comply with applicable Law
            as defined under the Agreement. Owner's environmental
            representatives or consultants shall be made available to Contractor
            at no cost to Contractor for consultation regarding development of
            these plans.

2.4.4       Contractor shall provide temporary facilities for construction
            management and Commissioning staff, including temporary power, water
            and sewer connection.

            The Contractor shall provide one five wide trailer for the Owner's
            use during construction in accordance with the layout shown on
            Exhibit B, promptly order and install after the Notice to Proceed.
            Contractor shall relocate the ten wide office trailer complex
            existing on site as of August 2004, to a location near the craft
            labor access road, for Contractor's use. Contractor shall be
            responsible for relocating and re-establishing utility

Exhibit A                                                               10-13-04

                                  Page 10 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            services if required to accommodate future switchyard/communications
            by others. Contractor shall supply temporary office furniture as
            agreed by Owner and Contractor.

            Contractor shall install temporary construction utilities including:
            electrical on-site distribution hardware, non-potable water and
            sewage disposal for Owner's facilities and supply janitorial service
            to these trailer facilities. Contractor shall provide drinking water
            for Contractor and Owner personnel use. The cost for Owner's phone
            service shall be the responsibility of Owner. The cost for
            Contractor's phone service shall be the responsibility of the
            Contractor.

            Contractor and Owner shall each be responsible for furnishing their
            own telephones, computers, computer services, software and supplies,
            fax machines, copy machines and general office supplies.

2.4.5       Contractor's temporary facilities shall be located within the
            Owner's property or in areas provided for construction use.
            Temporary facilities shall include:

            -     Office trailers, including power and telephone connections,
                  for Contractor's Field Staff

            -     Parking for Contractor and subcontractor personnel

            -     Parking for Owner's personnel

            -     Lay down and storage areas on-site

            -     Areas for subcontractor temporary facilities

            -     Temporary sanitary facilities for personnel on-site

2.4.6       Site Preparation

            Contractor shall provide Site preparation services including:

            -     Site Erosion Control

            -     Excavate, fill and final grading of the Project Site to the
                  extent necessary and rough grading of the evaporation ponds.

            -     Installation of temporary and permanent drainage culverts,
                  ditches and underground drainage piping within the plant site

            -     Excavation for underground piping, electrical and foundations

            -     Installation of permanent plant entrance road, plant loop
                  roads and parking area.

            -     Finished paving and grading within plant.

Exhibit A                                                               10-13-04

                                  Page 11 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            -     Clean-up and restoration of temporary lay down, areas outside
                  of plant and construction areas within plant, but not
                  including removal of existing gravel surfacing material and
                  fencing.

            -     Sanitary sewer system

            -     Repair of any fencing, any missing fencing and removal of
                  temporary fencing installed by Contractor prior to Final
                  Completion.

2.4.7       Foundations and Concrete

            Contractor shall provide excavation, compaction, backfill, material
            and installation of rebar and concrete for equipment, pipe rack,
            building and miscellaneous foundations.

2.4.8       Structural Steel

            The Structural Design Criteria for the Facility shall be in
            accordance with Attachment 9. Contractor shall erect structural
            steel required for pipe racks, equipment supports, access ladders
            and platforms, and miscellaneous structures.

            Notwithstanding the foregoing, Contractor will complete construction
            of the Facility per the design completed as a part of the Prior
            Work, including platforms and ladders per the Major Equipment
            Subcontractor's standard supply.

2.4.9       Buildings

            Contractor shall erect administration and maintenance building,
            water treatment building, and other miscellaneous yard structures as
            indicated in Article 3.6.

2.4.10      Mechanical Equipment

            Contractor shall install all Equipment necessary to complete the
            Facility in accordance with this Specification. Installation shall
            be generally in accordance with manufacturer's instructions.
            Installation shall include setting of equipment, grouting, and
            alignment. Contractor shall ensure vendor representatives shall be
            present at Site, as required by Contractor, for the equipment
            installation and commissioning. Contractor shall inspect and record
            all significant and substantial equipment installations, settings,
            and alignments as per the Contractor's QA/QC plan.

2.4.11      Piping

Exhibit A                                                               10-13-04

                                  Page 12 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            Contractor shall install all underground and above ground piping
            including field welding, installation of piping supports and guides,
            and testing in accordance with applicable piping specifications.

2.4.12      Electrical

            Contractor shall install all electrical equipment and material
            procured by Contractor including transformers, iso-phase bus duct,
            generator circuit breakers, power distribution centers, medium and
            low voltage switchgear, and motor control centers (MCCs), batteries,
            chargers, UPS, cable tray, conduit, cable and distributed control
            system (DCS). Contractor shall perform the installation in
            accordance with applicable Laws, generally in accordance with
            manufacturer's recommendations, contract drawings and specifications
            including, but not limited to, the National Electric Code (NEC
            1999).

2.4.13      Instrumentation

            Contractor shall install all instrumentation and control systems
            procured by Contractor, including CEMS, DCS, field instrumentation
            and associated instrument wiring. Contractor shall perform the
            installation in accordance with applicable Laws generally in
            accordance with manufacturer's recommendations, contract drawings
            and specifications, including but not limited to, the National
            Electric Code (NEC 1999).

2.4.14      Coating/Painting

            All field painting of Equipment, piping, buildings, stacks,
            structural steel and other components of the Facility shall be
            provided by the Contractor as mutually agreed between Owner and
            Contractor during the Assessment Period. All vendor-furnished
            equipment shall be supplied with a paint system as defined in the
            project painting/coating specifications (DENA-0-SP-5-PA-01). The
            paint system shall comply with Special Use Permit Stipulations.
            Contractor shall manage the painting contractor in the most
            economical way practical.

2.5         Commissioning and Performance Verification

            Contractor shall provide Commissioning and Performance Verification
            of the Facility including construction support during the
            Commissioning and Performance Verification phase of Work.

2.5.1       Commissioning

Exhibit A                                                               10-13-04

                                  Page 13 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            Contractor shall be responsible for system checkout, cleaning and
            flushing, system pressure verification, electrical continuity,
            setting of initial set points and all other such Commissioning
            activities for the Work.

2.5.2       Commissioning Activities

            Contractor's Commissioning Activities and Performance Verification
            shall include the following:

            -     Equipment initial operation and balancing

            -     Equipment alignment / adjustment

            -     Equipment lubrication

            -     Pipe flushing or high pressure water cleaning, or steam or air
                  blows

            -     Chemical cleaning

            -     Disposal of flushing and cleaning chemicals

            -     First fill of lube oils and chemicals (except Owner supplied
                  chemicals per clause 3.8.2) and will replenish to the extent
                  necessary to achieve Substantial Completion and will replenish
                  to at least 25% of storage capacity.

            -     Systems initial operation and adjustments

            -     Electrical insulation verification and continuity checks

            -     Verification and calibration of circuit breakers within the
                  Work

            -     Motor rotation verification

            -     Checkout and calibration of protective relays within the Work

            -     Phase rotation check of distribution equipment

            -     Instrument calibration

            -     Instrument loop checks

            -     Checkout of motor and pneumatic operated valves and control
                  valves

            -     Relief valve calibrations, including boiler relief valves and
                  adjustments required by ASME Code

            -     Installation of SCR catalyst following initial combustor
                  firing

            -     Demonstration Tests

                  The following functions will be demonstrated during the normal
                  course of commissioning. As these functions are demonstrated
                  and witnessed by the plant operating personnel, the successful
                  completion of these tests will be recorded in the plant log in
                  the Control Room.

Exhibit A                                                               10-13-04

                                  Page 14 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

                  Should Contractor fail to perform the successful completion of
                  these Demonstration Tests during the normal commissioning
                  effort, Contractor will specifically schedule and complete any
                  such tests prior to Substantial Completion.

                  -     Cold Start Up

                  -     Hot Start Up

                  -     Steam Turbine Bypass

                  -     Combustion Turbine Trip

                  -     Normal Shutdown

                  -     DCS - Normal Power Block Operations

                  -     DCS - Reduced Plant Operation

                  -     Equipment Lead-Lag Control

                  -     Water Treatment System

                  -     Chillers

2.5.3       System Turnover Packages

            Contractor shall commission the Facility by plant systems. These
            systems shall be identified prior to beginning commissioning
            activities at Site. The turnover of a system from construction to
            the commissioning group shall utilize a system turnover package
            containing appropriate documentation, similar to that listed below,
            assembled for each system. Subsequent to completing the
            commissioning activities, Contractor shall submit turnover packages
            and the appropriate documentation to Owner or Owner's designee for
            review and acceptance (which shall not be unreasonably withheld)
            prior to Substantial Completion. The exact timing of system turnover
            necessarily shall remain flexible to accommodate construction
            completion and commissioning priorities of specific systems, but
            shall meet or exceed the schedule requirements for the project.

            Owner or Owner's designee shall respond in writing to each turnover
            package within five (5) days of submittal by Contractor. If Owner
            agrees with Contractor's turnover package, Owner shall execute and
            deliver to Contractor a letter of acceptance. If Owner disagrees
            with Contractor's turnover package, Owner's response shall set forth
            in reasonable detail the reasons for such disagreement and
            Contractor shall take corrective action as in its judgment may be
            required to respond properly to the objections raised by Owner. If
            Owner does not respond to such turnover package within the requisite
            time period specified above, the turnover package shall be deemed
            accepted by Owner. Included with the turnover

Exhibit A                                                               10-13-04

                                  Page 15 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            packages may be a list of minor defects and deficiencies of the
            work, including documentation, not adversely affecting the safe
            operation of the plant. Such minor defects or punch list items shall
            not have to be corrected prior to Substantial Completion, but shall
            be corrected prior to Final Completion.

            Final records of the turnover packages will be a part of the final
            documentation provided to Owner at the end of the project and shall
            include:

            -     System turnover forms

            -     Hand-marked or revised P&IDs delineating boundaries of
                  mechanical systems and one-line diagrams delineating
                  boundaries of electrical systems

            -     System turnover punchlist

            -     Instrument device field calibration records

            -     Instrument loop field calibration records

            -     Circuit breaker verification and calibration records

            -     Protective relay verification and calibration records

            -     Megger / Hi-Pot verification reports

            -     Alignment and lubrication records

            -     Water analysis commissioning confirmation

            -     Chemical cleaning and flushing records

            -     Steam and / or air blow records

            -     Piping hydrostatic verification and radiographic reports

            -     Instrument set point records

3.0         SCOPE OF FACILITIES

            The following describes the Facility to be designed, constructed and
            commissioned.

3.1         Power Block

            The Power Block consists of the major power generation equipment and
            the associated auxiliary equipment. Each of the Power Blocks consist
            of two GE Model 7241 (also referred to as Frame 7FA enhanced) CTGs
            with

Exhibit A                                                               10-13-04

                                  Page 16 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            a nominal rating of 160 MW each, two (2) inlet air chiller packages,
            two (2) triple pressure level, reheat, HRSGs, one (1) GE condensing,
            reheat, down exhaust STG with a nominal rating of 300 MW, exhausting
            to an air cooled condenser, boiler feedwater pumps, condensate
            pumps, and interconnecting piping.

3.1.1       Combustion Turbine-Generators

            Four General Electric model 7241 CTGs for installation and
            commissioning by Contractor. The CTGs shall be 60 hertz, 3600 rpm,
            single-shaft gas turbines, directly connected to the generator, and
            shall be designed to burn natural gas only. The CTGs shall be
            supplied with the major auxiliary equipment and systems listed
            below:

            -     Combustion system

            -     Ignition system including ignition transformers, spark plugs
                  and interconnecting system

            -     Compressor inlet air plenum with drain connection

            -     Inlet duct air chiller coils

            -     Turbine exhaust plenum / diffuser

            -     Rigid type load coupling

            -     Enclosure for installation in an outdoor environment

            -     Dual exhaust frame blowers or cooling fans

            -     Dual enclosure air blowers

            -     Fire protection system

            -     Fire detection system

            -     On-line and off-line water wash manifold and piping to
                  enclosure edge

            -     Mounted terminal boxes and interconnecting wiring

            -     Mechanical Auxiliary System including:

                  -     Lubrication and hydraulic oil systems

                  -     Fuel gas control system

                  -     Starting system

                  -     Shaft turning system

            -     Gas cleaning, treatment and heating system including fuel gas
                  absolute separator, electric heater for dew point temperature
                  control (if required for commissioning), and IP hot water
                  heater for fuel gas preheating (one for each train)

            -     Packaged skid mounted hydrogen-cooled generator

            -     Inlet air system with self-cleaning pulse jet filters and
                  infrastructure for inlet chilling

Exhibit A                                                               10-13-04

                                  Page 17 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            -     Control module including turbine control and generator
                  protection systems with human-machine interface hardware in
                  each local PEECC and the Facility control room Generator
                  excitation system

            -     Compressor water wash skid (one per Block) suitable for both
                  on-line and off-line water wash including a ventilated and
                  heated enclosure for outdoor installation.

3.1.2       Inlet Chillers

            Two (2) complete inlet chiller systems for installation and
            commissioning by Contractor. The inlet chillers shall chill the
            inlet air of the CTGs to improve the overall performance of the
            plant. The design of the inlet chilling system shall be based on 2%
            ASHRAE wet bulb temperature. The refrigerant shall exchange heat
            with a closed-loop chilled water line, which shall then exchange
            heat with the inlet air of the CTGs via the air chilling coils. The
            resulting affect shall be chilled air entering the CTGs at
            approximately 45 degrees F. The inlet chillers shall be provided
            with the following features:

            -     Modularized design

            -     Centrifugal compressors - single stage

            -     Evaporator (air chilling coils)

            -     Two stage chilled water pumping system

            -     Condenser

            -     Cooling tower

            -     Lubrication system

            -     Control system

3.1.3       HRSGs

            Four (4) HRSGs for installation and commissioning by Contractor. The
            HRSGs shall be triple-pressure level with reheat. The nominal design
            conditions for the high-pressure steam system shall be 1800 psig at
            1050 degrees F with reheat to 1050 degrees F. The HRSGs shall be
            provided with the following features:

            -     Duct burners

            -     Selective Catalytic Reduction (SCR) system for NOx reduction

            -     CO Catalyst

            -     Feedwater regulating control valves

Exhibit A                                                               10-13-04

                                  Page 18 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            -     Cold casing design (Internal Insulation)

            -     Access stairs, ladders and platforms

            -     Height and diameter of exhaust stacks in accordance with the
                  Air Permit (Authority to Construct dated 6-3-04)

            -     Stack dampers

            -     Ammonia injection system for SCR usage

3.1.4       Duct Burners and SCR System

            Four (4) duct burners for installation and commissioning by the
            Contractor. Each duct burner shall be complete including firing
            equipment, duct enclosure (burner frame), fuel train skid, and
            burner management system. The duct burner system shall not be
            operated unless the corresponding CTG is at its full load capacity.

            Four (4) SCR systems including the catalysts as well as other system
            components for installation and commissioning by the Contractor. The
            SCR systems shall utilize 19.4% aqueous ammonia to control NOx
            emissions. Contractor shall furnish and install the equipment for
            storage and delivery of the aqueous ammonia.

3.1.5       STG

            Two (2) General Electric STGs for installation and Commissioning by
            Contractor. These STGs convert the thermal energy in the steam
            produced in the HRSGs to electrical energy. Each STG consists of
            combined high pressure / intermediate pressure (HP/IP) sections in a
            common case, and a low-pressure section. High-pressure steam is
            supplied to the HP section of the steam turbine. The HP turbine
            exhaust is returned to the reheat section of the HRSGs. The reheat
            steam mixed with the IP steam is returned to the IP section of the
            steam turbine. The IP turbine exhaust is discharged to the LP
            section. LP section steam flow is exhausted to the condenser.

            The generator shall be hydrogen cooled with static excitation.
            Generator shall be rated at 0.95 leading / 0.85 lagging power
            factor. Each STG shall be supplied with the following accessories:

            -     HP stop and control valves

            -     Valving for cascade by-pass

            -     Lube oil system with dual coolers, AC driven pump and DC
                  driven emergency pump

Exhibit A                                                               10-13-04

                                  Page 19 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            -     Hydraulic oil system

            -     Seal steam system

            -     Insulation system

            -     Turbine control system

            -     Generator excitation system

3.1.6       Air Cooled Condenser Unit (ACCU)

            Two (2) complete air-cooled condenser units for installation and
            commissioning by Contractor. The air-cooled system will provide
            cooling for condensing the STG exhaust. The system will consist of
            multiple cell air-cooled condenser sections constructed of carbon
            steel with utility grade carbon steel finned-tube bundle assemblies,
            axial fans, duct from the STG to ACCU, duct heaters, condensate
            storage tank and pumps, air removal system and bundle cleaning
            system.

            The condenser duct shall include distribution headers necessary for
            the steam turbine bypass to dump main steam into the condenser after
            the pressure and temperature of the steam have been reduced.

            Steam cycle make-up water shall be added from the demineralized
            water storage tank by the demineralized water pump through a level
            control valve.

            Condenser vacuum shall be initially developed and normally
            maintained by the steam jet air extraction system supplied with the
            condenser. This system shall reduce the condenser pressure from
            atmospheric upon each restart, and continuously remove
            non-condensable gases from the condenser during normal operation.

3.1.7       Condensate Pump

            The condensate tanks shall supply condensate to the suction of the
            vertical can-type condensate pumps that pump condensate to the HRSG
            LP drum. Two 100% capacity condensate pumps shall be provided per
            condenser.

3.1.8       Main Steam System

            The main steam system provides distribution of HP, IP / Reheat, and
            LP steam to each STG on a per Power Block basis. High pressure steam
            shall flow from each HRSG through an isolation valve and into the
            high pressure steam header, where the steam shall be routed to the
            STG. Intermediate pressure steam shall be mixed with cold reheat
            steam from the STG and further superheated in the HRSG re-heaters.
            Hot reheat steam

Exhibit A                                                               10-13-04

                                  Page 20 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            shall flow from each HRSG to the hot reheat steam header, which
            delivers the steam to the IP section of the STG. Low-pressure steam
            shall flow from each HRSG into the low-pressure steam header that
            delivers the steam to the LP sections of the STG, where it mixes
            with IP exhaust steam.

            A STG bypass system shall provide a means to bypass each steam
            turbine during start-up and plant upset conditions only, including
            steam turbine trips. However, the bypass system is not designed to
            allow the plant to operate in bypass mode for durations longer than
            four (4) hours in a twenty-four (24) hour period. The STG bypass
            system shall include the necessary valves and piping to transfer
            steam flows from the steam turbine to the air cooled condenser.
            Valves and controls to protect the steam turbine shall be supplied
            with the steam turbine.

            Each STG bypass shall be sized to bypass 100% of the steam from both
            HRSGs (without duct firing).

3.1.9       Boiler Feedwater Pumps

            Each HRSG shall be provided with two 100% capacity (one operating
            and one standby), motor driven, multistage, segmented-ring boiler
            feed water (BFW) pumps. The pumps shall take suction from a single
            HRSG low-pressure drum and pump the water to the corresponding
            intermediate pressure and high-pressure drums. Feed to the IP drum
            shall be via an inter-stage bleed. Each BFW pump shall be provided
            with bearing temperature monitoring and vibration switches.

            Each BFW pump shall be provided with a recirculation line to
            maintain the minimum pump flow rate and for warm up of the pumps as
            specified by the pump manufacturer.

3.2         Balance of Plant Systems

            The following sections describe the balance of plant systems.

3.2.1       Closed Loop Auxiliary Cooling System

            The closed loop auxiliary cooling water (ethylene glycol-water
            solution) system provides cooling for auxiliary equipment. The
            system will utilize demineralized water with corrosion inhibitor.
            Two (2) 100% pumps will be provided per cooler. A wet surface air
            cooler will remove heat from the closed loop cooling water at high
            ambient temperatures. A fin fan cooler operates at all ambient
            conditions to remove heat from the system.

3.2.2       Natural Gas Supply

Exhibit A                                                               10-13-04

                                  Page 21 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            The natural gas supply system consists of the metering station,
            natural gas treatment and heating, and supply piping to the
            combustion turbines, duct burners, and auxiliary users.

            The Owner shall furnish and commission the natural gas revenue
            metering station. This station shall include the natural gas revenue
            metering, pressure regulation, and necessary liquid removal
            equipment, if required. Contractor shall provide technical support
            to Owner to assist in defining the interfaces with the natural gas
            supply company. Owner shall provide all hardware and associated
            installation for pressure control and shutdown at the metering
            station. Contractor shall connect to the metering station at a
            flange located as shown on the Interface Plan, Attachment 13.
            Contractor shall commission the system from the interconnection
            point into the Facility. Odorization of natural gas by Contractor is
            not provided.

            Owner shall provide, within the power plant area, the natural gas
            treatment and heating equipment as part of the CTG scope of supply.
            Contractor shall install and commission the gas treatment equipment
            supplied as part of the CTG scope. The Contractor shall coordinate
            these tie-in connections with the Owner.

3.2.3       Boiler Feed Water Treatment System and Condensate Storage

            Blowdown from the chiller cooling tower and wet surface air coolers
            shall be used as makeup for the boiler feedwater (BFW) treatment
            system. The BFW treatment system shall reduce dissolved solids to
            the final boiler feed water requirements through a demineralized
            water treatment system.

            Demineralized water from the BFW treatment system shall be stored in
            the demineralized water storage tank that provides make-up water to
            the surface condenser hotwell. The storage tank shall provide
            sufficient storage capacity for requisite cycle make-up. The tank
            shall provide suction to two 100% forwarding pumps and shall have
            connections to receive excess condensate from the condenser hotwells
            during Facility transient conditions. The BFW System shall include
            the following or equal equipment:

            -     One (1) mixed-bed polisher

            -     Two (2) 100% Demineralized Water Pumps

            -     One (1) 225,000 gallon Demineralized Water Storage Tank

            -     Interconnecting piping and valves

3.2.4       Boiler Blowdown

Exhibit A                                                               10-13-04

                                  Page 22 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            The boiler blowdown system shall collect drains from the HRSGs and
            the related main steam cycle components. The drain piping routes
            steam generator component drains, including steam drum blowdown and
            miscellaneous related drains, to blowdown tanks as required to
            dissipate steam energy and collect condensate for fluid transfer.

3.2.5       Chemical Feed for Boiler Feedwater

            The purpose of the Chemical Feed for Boiler Feedwater system is to
            protect the HRSGs from corrosion and scale formation. The system
            shall consist of the following major equipment for each HRSG:

            -     One (1) 100% polyphosphate injection pump/tank

            -     One (1) 100% oxygen scavenger injection pump/tank

            -     One (1) 100% amine injection pump/tank

            -     Chemical storage facilities

            -     Piping, valves, and appurtenances

            The chemical feed system shall be designed based on using Betz
            chemicals.

            The chemical feed systems shall maintain water chemistry at
            acceptable conditions. An oxygen scavenger shall be fed to the
            condensate pump discharge for oxygen scavenging. Phosphate shall be
            fed to the HP boiler drum to maintain the desired level of phosphate
            concentration and metal passivation. Neutralizing amine shall be fed
            to the LP Drums for neutralizing acid-forming gases and to maintain
            the desired pH.

            Each chemical feed system shall include a chemical feed pump with
            stroke adjustment which can be manually set to control the flow rate
            of chemical feed and, if needed, a timer which can be manually set
            to control the start time and run time of the pump.

            The chemical conditioning system for the HRSGs shall be sized to
            maintain the proper amount of chemical conditioning at the
            applicable full condensate flow rate. Each set of pumps shall be
            provided with suction strainers and connections for a portable
            calibration column. Materials for the chemical feed pumps shall be
            fully compatible with the chemicals handled and the system operating
            conditions.

3.2.6       Raw Water Supply

Exhibit A                                                               10-13-04

                                  Page 23 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            Raw water for the facility will be supplied from two wells located
            on the Site. The on-site water well will feed raw water to the water
            treatment system to be clarified, filtered and treated by chemical
            addition. This treated water will be stored in two tanks to be used
            for all water system needs and firewater.

            The supply and installation of the water wells, well pumps and
            motors and any local well controls and/or power transformer is by
            Owner. Contractor will supply piping from the water well pump
            flanges to the water treatment facility within the plant. Contractor
            will also provide a 4160V, 3 phase, 60HZ electrical feed and the
            control interface. The control interface will be via fiber optic
            cable.

            Only one well may be operated at a given time. Well WS-2 shall be
            the primary well with WS-1 controlled manually as a backup. Both
            wells shall be headered together with the piping to the water
            treatment system.

            A sample water analysis was taken from the existing Kerr McGee water
            well and is included as Attachment 6.

            A more complete description of the water treating system is found in
            the Water System Design Criteria included as Attachment 11.

3.2.7       Auxiliary Boiler

            The Auxiliary Boilers shall be fire tube, low emission, gas-fired,
            natural circulation, packaged type boilers complete with single gas
            burner, motor-driven forced draft fan, electronic programming and
            flame safeguard controls, boiler limit and fuel safety interlocks,
            fully automatic combustion controls, feed water regulator and
            control panel.

            Auxiliary Boilers provide steam until the HRSGs begin providing
            steam and sparging steam upon plant shutdown. During initial
            start-up (i.e. with no cold reheat or HP steam available), auxiliary
            steam will be provided by the auxiliary boilers at 125 psig
            saturated. The auxiliary boilers are fired by natural gas from the
            Fuel Gas System. Make-up water for the auxiliary boilers is supplied
            from the Demineralized Water System, with the water deaerated by the
            Auxiliary Boiler Deaerators. Two relief valves protect each
            auxiliary boiler from over pressurization.

3.3         Electrical Systems

            The Electrical Design Criteria is included as Attachment 10. The
            Facility shall include the following electrical systems.

Exhibit A                                                               10-13-04

                                  Page 24 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

3.3.1       Generator Electrical System

            The generator electrical system provides the means of connecting
            each generator output to the Owner-supplied transmission
            lines/switchyard and to the Auxiliary Electrical system. Six (6)
            main step-up transformers for installation and commissioning by
            Contractor are provided as described below.

3.3.1.1     CTG - Electrical

            Each CTG shall be connected via isolated phase bus duct to an 18 kV
            generator circuit breaker and generator step-up (GSU) transformer.
            The generator main leads shall consist of an isolated phase bus
            connection from the generator bushings to the GSU transformer low
            side terminals via the generator breaker. The GSU transformer shall
            convert power from the 18 kV generator voltage to the 525 kV
            transmission voltage level.

3.3.1.2     STG - Electrical

            Each STG shall be connected to the generator step-up transformer via
            isolated phase bus duct. The STG generator breaker shall be on the
            high voltage side of the GSU transformer. The generator main leads
            shall consist of an isolated phase bus connection from the generator
            bushings to the GSU transformer low side terminals. The GSU
            transformer shall convert power from the 18kV generator voltage to
            the 525kV transmission voltage level (The GSU transformer high side
            bushings shall be connected by Owner to the STG generator circuit
            breaker supplied by Owner).

3.3.1.3     Transmission Line Interconnection

            Owner shall supply the STG circuit breaker on the high side of each
            STG main step-up transformer and all associated 525kV equipment.
            Owner shall supply all necessary hardware and the installation to
            connect both CTG GSU transformers, the STG GSU transformers and the
            generator circuit breaker to the owner-supplied 525kV transmission
            line/switchyard. Control, relaying and metering wiring and raceways
            from and to equipment furnished by Owner shall be designed,
            furnished, and installed by Owner. Terminations of
            Contractor-furnished cabling at Owner-furnished equipment shall be
            by Owner.

3.3.1.4     Generator Electrical System

            The generator electrical system per Power Block shall include:

            -     CTG1 GSU Transformer with Lightning Arresters

            -     CTG2 GSU Transformer with Lightning Arresters

Exhibit A                                                               10-13-04

                                  Page 25 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            -     STG GSU Transformer with Lightning Arresters

            -     18kV CTG Generator Circuit Breakers

            -     18kV Isolated Phase Bus Ducts

3.3.2       Auxiliary Electrical System

            The auxiliary electrical system provides a means of stepping-down
            the generator terminal voltage to deliver power to the plant
            auxiliaries and equipment. The high voltage side of each unit
            auxiliary transformer (UAT) shall be connected to the 18kV main
            leads between each CTG circuit breaker and its respective GSU
            transformer. The low side bushings of the UATs shall be connected to
            4.16kV switchgear.

            The 4.16kV system shall include the necessary breaker transfer
            equipment to allow starting of either gas turbine generator with the
            other gas turbine generator operating.

            Station service transformers shall step-down three-phase 4,160 volt
            power to three phase 480V power for service to the 480V switchgear.
            The three phase 480V power from the 480V switchgear shall be
            distributed throughout the plant to the MCC(s), miscellaneous
            distribution equipment, motor loads of 200 horsepower and below, and
            other low voltage plant loads. The auxiliary electrical system shall
            include the following major equipment:

            -     100% Unit Auxiliary Transformer

            -     4,160V Switchgear

            -     480V Switchgear

            -     4,160V-480V Station Service Transformers

            -     480V MCCs

            -     125V AC System and 120V AC Uninterruptible Power Supply (UPS)

3.3.3       Facility Electrical

            The Facility electrical system provides a power distribution system
            at various voltage levels for lighting, receptacles and smaller
            loads (motors, HVAC, etc.) as required for all buildings, the well
            pumps, and site support facilities. The Facility electrical system
            shall originate from 480 volt sources such as MCCs or power
            distribution panels. These sources shall provide power to
            miscellaneous loads, lighting, welding, HVAC and transformers at
            various load power requirements (i.e. 120V, 208V, and 480V).

3.3.4       UPS

Exhibit A                                                               10-13-04

                                  Page 26 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            The UPS system shall provide low voltage AC power to vital circuits
            that require uninterruptible AC power and are considered vital for
            the safe operation and monitoring of the equipment during both
            normal and transient operating conditions. Typical loads that are
            considered for connection to the UPS include the Distributed Control
            System, the turbine supervisory instrumentation, programmable logic
            controllers (PLCs), shutdown networks, plant telephone system, and
            certain vendor-supplied control panels.

            The UPS system shall provide continuous 120 volt, 60 Hz power to the
            vital systems at the Facility. During normal operation, the station
            DC system shall provide power to the UPS inverter. The inverter
            shall convert the DC to 120 volt AC and provide power to the
            distribution panel through a static switch. A backup feed from the
            alternate AC power source shall power the step-down transformer. The
            output of the transformer shall be the second power source connected
            to the static switch. The static transfer switch shall automatically
            transfer to the alternate AC source when output voltage of the
            inverter deteriorates. Upon loss of synchronization, the static
            switch shall inhibit transfer to the alternate AC power source. A
            manual bypass switch shall provide a means to remove the inverter,
            battery, and static switch from service without interrupting the
            power to the distribution panel. The UPS system shall consist of the
            following components per 2 X 1 Power Block.

            -     Static inverter

            -     Static transfer switch

            -     Alternate source transformer

            -     Manual make-before-break bypass switch

            -     Two AC circuit breakers (alternate input and bypass source)

            -     One DC circuit breaker with shunt trip

            -     Vital 120 V AC distribution panel with fused disconnects or
                  breakers

            -     Controls, indicating lights, meters and alarm to control the
                  UPS

3.3.5       125 Volt DC Power

            The DC system shall provide power and control power for emergency
            equipment required for the safe shutdown of the plant. These loads
            typically include emergency DC lube oil pump associated with the
            STG, control power for power circuit breakers, switchgear,
            protective relaying, and the inverter.

Exhibit A                                                               10-13-04

                                  Page 27 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            During normal operation the battery shall remain fully charged while
            the chargers supply power to all of the DC loads. If the plant AC
            power system fail, the battery shall provide power to the critical
            and emergency loads until the unit is safely shut down or returned
            to service. When the AC power is restored, the chargers shall be
            capable of supplying the plant DC power requirements while
            simultaneously recharging the battery within 24 hours.

            The DC system shall include a multiple cell storage battery, two
            100% capacity battery chargers and a DC distribution switchboard.

            In addition to the plant DC power system, each CTG shall be
            furnished with its own 125 V DC system including charger and
            battery. These systems shall supply all DC loads associated with
            each CTG.

3.3.6       Emergency Diesel Generator

            Two emergency diesel generators shall be provided one per Power
            Block. Each generator shall be sized to feed one (1) wet surface air
            cooler fan, one (1) auxiliary wet surface air cooler exchanger pump,
            one (1) auxiliary closed loop cooling water pump, one (1) STG main
            lube oil pump, and one (1) STG turning gear.

3.3.7       Grounding

            The grounding system shall provide protection for personnel and
            equipment from the hazards that can occur during power system faults
            and lightning strikes. Contractor shall ensure the design and
            installation meets all applicable Laws. System design shall include
            the ability to detect system ground faults. The station grounding
            system shall be an interconnected network of bare copper conductor
            and copper-ground rods. In the plant area, grounding stub-ups shall
            be brought above grade in close proximity and connected to the
            building steel and selected equipment. The grounding system shall be
            extended to the remaining plant equipment per installation
            specifications.

            An instrument grounding system shall be provided in accordance with
            the grounding requirements of the DCS manufacturer. As a minimum,
            isolated instrument ground busses shall be connected to designated
            ground rods via insulated ground conductors to maintain isolation
            between safety and instrument grounds. The instrument ground system
            shall be bonded to the plant ground system at a minimum of one
            location. The grounding system shall:

            -     Protect personnel from electric shock hazards

            -     Protect equipment from excessive voltage

            -     Facilitate isolation of faulted systems

            -     Permit the dissipation of transient currents

Exhibit A                                                               10-13-04

                                  Page 28 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            -     Provide a stable reference point for instrumentation and
                  control circuit measurements

            -     Safely dissipate lightning discharges

3.3.8       Continuous Emission Monitoring System (CEMS)

            A CEMS shall be provided for each HRSG stack to measure air
            emissions and generate reports. The CEMS shall be supplied and
            calibrated in accordance with the final Facility Air Permit
            (Authority to Construct dated 6-3-04) requirements, as administered
            by the permitting authorities in Nevada, as well as provide all
            required data logging and reporting. The CEMS shall include sample
            probe, sample conditioning, sample line, analyzers, calibration gas
            bottles for zero and span calibration, necessary connections,
            regulators, gauges, and solenoid valves and shall be furnished to
            provide a fully functional system. The Guideline on Continuous
            Monitoring Systems attached to the Final Air Permit shall only be
            used as a general reference document for development of the CEMS
            Quality Assurance Plan.

3.3.9       Heat Tracing System

            A plant heat tracing system shall be provided as specified in
            Attachment 10. The heat tracing system in the Power Block shall
            consist of self-regulating heat tracing cable, thermostats, heat
            tracing panels with main contactor and circuit breaker panels. Each
            heat tracing panel shall include a status light at each feeder
            breaker indicating voltage is "ON" the branch circuit. Status of
            each heat tracing panel incoming contactor shall be wired to the
            DCS. Heat tracing requirements for balance of plant areas (i.e.
            cooling tower area) shall be fed directly from a local distribution
            panel board.

3.4         Plant Control System

            The Contractor shall ensure that the plant control system meets the
            applicable project specifications and is generally in accordance
            with ISA standards. The control system shall be a fully integrated
            microprocessor-based system in a functionally distributed
            architecture consisting of redundant processors. The control system
            shall be programmed to perform specific control, data acquisition,
            alarming, shutdown, reporting, and other operational tasks. The GE
            control system controls the shut-down of CTGs and STG. The
            processing units shall communicate with the operator CRT consoles,
            input/output cabinets, and control systems work stations, combustion
            and steam turbine/generator control systems, and other control
            subsystems via redundant data highways and/or data links. Where
            necessary, communication with the third party control systems (such
            as CTG's and STGs, demineralizer, etc.) shall be simplex (not
            redundant).

Exhibit A                                                               10-13-04

                                  Page 29 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

3.4.1       Plant instrumentation of sufficient accuracy shall be installed to
            perform Facility Performance Verification.

3.4.2       The control system design shall include redundancy, as depicted in
            the P&IDs in Attachment 2, to avoid device failures from
            significantly impacting unit safety, control and operation. The
            controls for CTGs, STGs, HRSGs and balance of plant equipment shall
            be interfaced to provide an integrated Facility control system.

3.4.3       The control system shall provide analog (modulating), and digital
            (on/off) control and monitoring of the Facility equipment and
            systems. Sufficient sequence of events input points shall be
            provided to monitor and alarm various trip signals to support
            post-trip analysis.

3.4.4       The control system shall support both automatic and manual modes of
            operation, and shall provide the operator with real time information
            on equipment status and process variables via CRT displays and/or
            printed logs. The control system operator stations shall provide the
            operator with single window interface capabilities for all normal
            unit and plant control functions.

3.4.5       The control system shall automatically alarm, display on CRT(s),
            and/or record on log printer(s) out-of-limit and abnormal
            conditions.

3.4.6       The control system shall be a microprocessor-based system consisting
            of the following major components:

            -     DCS processors, power supply, communications hardware and
                  associated cabinets. DCS processors, power supplies, and
                  communications hardware are to be of a redundant design

            -     Input/output subsystems for digital and analog interface with
                  field instrumentation and equipment and the associated
                  input/output cabinets.

            -     Eight (8) DCS Operator stations including, but not limited to
                  CRT, mouse, keyboard, storage and hard copy devices The entire
                  plant can be operated by any combination of DCS Operator
                  stations.

            -     Storage media for system and control configuration including,
                  but not limited to graphics, report forms, and programs

            -     System input/output cabinets with redundant power supplies

            -     Redundant communications data highway for DCS

Exhibit A                                                               10-13-04

                                  Page 30 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            -     Three (3) engineer's work stations consisting of one
                  Professional Plus work station and two Professional work
                  stations, and one application station (historian)

            -     Two (2) color printers and two (2) black/white printers

3.4.7       Contractor shall provide assistance and shall coordinate with Owner
            on interfacing the DCS to the plant monitoring and control package
            supplied, installed and commissioned by Owner. Contractor has no
            responsibility for the programming or set up of the servers not
            directly associated with the plant DCS.

3.4.8       Miscellaneous third party control systems are supplied with
            mechanical equipment, such as the turbine generator control systems
            (redundancy consistent with DCS philosophy), demineralized water
            control system (simplex), CEMS, etc.

3.5         Utility Systems

3.5.1       Plant/Instrument Air

            The plant/instrument air system shall supply clean, dry, oil-free
            air at the required pressure and capacity for all pneumatic
            controls, transmitters, instruments and valve operators and clean
            compressed air for non-essential plant air requirements. The
            plant/instrument air system shall include the following:

            -     Two (2) 100% capacity, air cooled, single stage, oil
                  lubricated rotary screw type air compressors, instrument
                  panel, lubrication system, after-cooler, moisture separator,
                  intake filter-silencer, air/oil separator system and an
                  unloading valve

            -     One (1) full capacity air receiver

            -     Two (2) full capacity, dual tower, heater-less type desiccant
                  air dryers

            -     Two (2) full capacity pre-filters

            -     Two (2) full capacity after-filters

            -     Associated header and distribution piping and valves

            The plant air system shall be taken through flow limiters that serve
            to protect the integrity of the instrument air system.

3.5.2       Service Water

Exhibit A                                                               10-13-04

                                  Page 31 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            Water from the Raw Water/Firewater Storage Tank shall be used as
            service water. Service water shall be routed to various utility
            stations throughout the Facility to be used for general wash down
            and utilities such as water seals, cleaning, and flushing.

3.5.3       Potable Water

            Water from the Raw Water/Firewater Storage Tank shall also be used
            to generate potable water. Contractor shall provide and install the
            potable water system, which consists of a raw water storage tank, a
            pretreatment system, a reverse osmosis (RO) system, a bladder
            tank/pump system, and a RO water storage tank. Safety showers will
            be supplied by the potable water system.

3.5.4       Wastewater

            Process wastewater contaminated with oils will be segregated from
            other wastewater and routed to the oily waste water system. Various
            oil contaminated wastewater streams will be collected in the Turbine
            Area oily wastewater sumps, 1 & 2 GT-Sump-0100, and then pumped to
            an oil/water separator to separate and remove the oil.

            Oil from the oil/water separator will gravity flow to the Oil sump,
            0WT-Sump-0100 which will be periodically emptied by a waste hauler.
            The Clear Water Sump, 0WT-Sump-0200, receives clean, oil-free, water
            from the OWS separator before recycling the water to the CTBD Surge
            tank for reuse in the Water Recovery System.

            Steam blowdown streams will be collected in the HRSG Blowdown Sumps,
            1 & 2BB-Sump-0100, and pumped to the CTBD Surge tank.

            GT wash water streams are directed into the respective Gas Turbine
            Compressor Wash down Collection Sumps, 1GT-Sump-1110 and
            2GT-Sump-2110. The Gas Turbine Compressor Wash down Collection Sump
            is sized to hold the off-line wash drainage for two gas turbine
            washes so that back-to-back gas turbine off-line washings are
            possible. The collection sump will be emptied with a vacuum truck
            designated for proper off-site disposal.

            Curbed containment sumps are provided in the chemical storage areas.
            These containment sumps include manual drain valves mainly for
            draining rain water which are normally closed.

            A regeneration waste neutralization system will receive the
            regeneration wastes from the cation exchangers and the chemical
            containment sump. This system neutralizes the pH by the addition of
            acid or caustic prior to discharge to solar evaporation ponds.
            Maximum discharge to the ponds is 23-30 gallons per minute.

            The design and associated permitting of the evaporation pond shall
            be furnished by Owner. Installation and construction permits for the
            evaporation pond is by Contractor. The evaporation ponds shall
            consist

Exhibit A                                                               10-13-04

                                  Page 32 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            of two cells approximately equal in size. The ponds are designed for
            periodical removal of accumulated salts during this period based on
            the water analysis in Attachment 6. The water surface area at the
            operating capacity covers approximately 10 acres. The operating
            depth of each cell is approximately 4.5 feet. The beam crests are
            sized to facilitate vehicle traffic. All side slopes of the pond are
            at a 3:1 (H:V) slope.

3.5.5       Sanitary Waste

            The sanitary waste system shall collect facility sanitary wastes and
            route the waste to a leach field. The sanitary waste system shall be
            designed to carry and treat the design flows associated with 32
            personnel, consisting of staff and visitors. The system shall be
            designed to comply with all applicable Laws.

3.5.6       Plant Security

            The plant security system shall control access to the plant site for
            all visitors and employees. The security system shall include the
            following:

            -     A fence surrounding the Facility perimeter

            -     A motor-operated gate with a card reader or keypad

            -     An intercom system between the gate and the control room and
                  the administration area

            -     A closed circuit television system with a monitor in the
                  control room and the administration area

            During construction, the Contractor shall provide perimeter safety
            and security fencing around the working areas.

3.5.7       Fire Protection

            The Fire Protection Design Criteria shall be as specified in
            Attachment 5.

3.5.8       Plant Telephone System

            The plant telephone system shall include telephone outlets in the
            administration offices, control room, maintenance shop, warehouse
            area, PDC 1A/1B/2A/2B, PEEC four (4), two (2) Sample Panel, four (4)
            Inlet Chillers, and four (4) CEMS. Owner shall supply plant
            telephone private branch exchange (PBX) equipment for switching
            on-site telephones and for connection to local phone service.
            Additional lines for fax machines shall be furnished in the
            Administration Building. Wiring shall be installed in the
            administration offices, control room and maintenance area for
            implementation of a local area network by Owner. Owner shall provide

Exhibit A                                                               10-13-04

                                  Page 33 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            phone handsets for each of the offices. Contractor shall provide
            wiring and outlets.

            Contractor shall install a dedicated telephone line for the GE LTSA
            which shall have an On-Site Monitor (OSM) that the controller can
            report machine data to a central monitoring station for GE.

3.6         Buildings and Roads

3.6.1       The following buildings shall be provided as part of this
            Engineering and Construction Agreement:

            1.    Administration/Main Control Room Building - reference attached
                  drawings per Attachment 12 for the Floor Plan. The building
                  shall incorporate the plant control room and offices for the
                  Facility administrative staff. It shall be designed to meet
                  the requirements of the Americans with Disabilities Act (ADA).
                  One male and one female restroom shall be provided as well as
                  an unfurnished breakroom area with basic kitchen type cabinets
                  and appliances as shown on the reference drawings. Floor
                  finishes shall be vinyl in the offices area and breakroom,
                  vinyl flooring in the restrooms and mechanical room and an
                  access floor system in the control and IT rooms with a
                  laminate finish. The building shall be heated and
                  air-conditioned. Entrance doors shall include an airlock for
                  all external entrances. The building shall be provided with a
                  sprinkler system for fire protection.

            2.    Warehouse/Maintenance Building - reference attached drawings
                  per Attachment 12 for the 1st Floor Plan and 2nd Floor Plan.
                  The building shall be provided with gang shower area in the
                  men's restroom, in addition to a handicap accessible shower
                  and a handicap accessible shower only in the women's restroom.
                  The maintenance area of the building shall include shop space
                  for routine plant maintenance activities. Electrical service
                  shall be provided for the Owner-supplied machine shop
                  equipment. The building shall be heated and air-conditioned.
                  The building shall also be provided with a sprinkler system
                  for fire protection.

            3.    Water Treatment Building - The water treatment building shall
                  be per Attachment 12 and shall be heated and the electrical
                  room (only) shall be air-conditioned.

            4.    Fire Pump House - The building is estimated to be 20'X20'X12'
                  high and shall be heated and ventilated.

Exhibit A                                                               10-13-04

                                  Page 34 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            5.    Power Distribution Center (PDC) Buildings - The buildings
                  shall be pre-fabricated type and shall be heated and
                  air-conditioned.

3.6.2       The scope for all buildings does not include any furnishings such as
            desks, tables and chairs.

            The scope shall include an asphalt plant access road and asphalt
            loop plant road around the perimeter of the area occupied by the
            turbines, HRSG's, air cooled condenser and PDCs. An asphalt-paved
            parking lot with adequate space for 32 vehicles including one
            handicap accessible space shall be provided. All gas bottle areas
            will be asphalt-paved to accommodate forklift access.

3.7         Temporary Construction Utilities

            Contractor shall provide the following temporary construction
            utilities:

            -     Construction Power - Contractor shall provide temporary diesel
                  generators and necessary fuel for temporary construction power
                  connection from the start of construction activities at the
                  Site through 12-31-04 at Owner's cost. Contractor may utilize
                  Owner's two temporary existing 800 KW diesel generators for
                  construction power.

            -     Telephone - Contractor shall utilize the permanent service
                  pedestal that it shall have installed at the property for
                  temporary construction needs.

            -     Sanitary Sewer - Contractor shall utilize third party
                  contracted service to provide holding tanks and port-a-lets
                  for sanitary sewer needs. Permanent sanitary waste facilities
                  shall be provided prior to permanent occupancy.

            -     Drinking Water - Contractor shall provide drinking water.

            Owner shall provide the following temporary construction facilities

            -     Fuel Gas, back-feed power and electric load.

            -     Water - Owner shall make available to Contractor two water
                  wells to supply construction raw water and permanent plant
                  water.

            -     Owner shall provide tie-in and pay for all construction power
                  on and after 1-1-05.

            -     Temporary Lay-Down - Owner shall provide temporary
                  construction lay-down areas defined in Exhibit B.

3.8         Lubricants/Oils/Chemicals/Gases

Exhibit A                                                               10-13-04

                                  Page 35 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

3.8.1       Lubricants/Oils

            Contractor shall supply initial fill of all lubricants and oil and
            shall top off at Substantial Completion. Contractor may at its
            option utilize flushing oils for permanent installation after
            adequate processing.

3.8.2       Chemicals

            Contractor shall provide initial fill of chemicals except for water
            treatment (pretreatment, cooling tower, demineralized and boiler
            feedwater chemicals, which shall be provided by Owner). Contractor
            shall replenish all chemicals to the extent necessary to achieve
            Substantial Completion of each respective Power Block (except for
            Owner supplied water treatment chemicals) and all chemicals consumed
            during commissioning at Substantial Completion of each respective
            Power Block and will replenish to at least 25% of storage capacity.
            Contractor will provide necessary support labor to install Owner
            supplied chemicals.

3.8.3       Gases

            Contractor shall provide all gases (except for fuel gas) necessary
            for construction and commissioning of the facility. Contractor shall
            provide storage hydrogen trailer/bottles including transportation
            costs for the duration of commissioning. Contractor shall pay for
            hydrogen consumed through Substantial Completion. Contractor shall
            replenish to the extent necessary to achieve Substantial Completion
            of each respective Power Block and will replenish to at least 25% of
            storage capacity gasses consumed during commissioning at Substantial
            Completion.

B.          PERFORMANCE GUARANTEES AND VERIFICATION PROCEDURES

1.0         PURPOSE

            The purpose of this Section is to define the criteria for plant
            performance guarantees, the basis for guarantees, Contractor's
            obligation for Performance Verification of each Power Block, and
            verification acceptance criteria for demonstrating that contractual
            performance guarantees have been met in accordance with this Exhibit
            A.

            There are a total of four (4) Acceptance Test types:

            -     Plant Performance Tests (Output and Heat Rate)

            -     Three (3) Day Reliability Test (After Substantial Completion)

Exhibit A                                                               10-13-04

                                  Page 36 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            -     Environmental Compliance Test

            -     Utility Acceptance Test

            Operation during testing with altered or modified control systems,
            or using methods of operation that would not be recommended or
            normally used for long term operation under prudent power contractor
            practices will not be allowed under such procedures.

2.0         PLANT PERFORMANCE TESTS

2.1         Performance Guarantees

            The "Power Block Performance Test" shall mean the test of each Power
            Block independently to demonstrate the Power Block's compliance with
            the Power Block Performance Guarantee for Net Electrical Output and
            Net Heat Rate. The Power Block test shall consist of two (2)
            combustion turbines, associated HRSGs and steam turbine operating at
            base load and steady state conditions, chillers off, duct burner on
            at 300 mmbtu/hr (LHV) heat input to each HRSG, and air cooled
            condenser fans operating to maintain the STG backpressure below the
            alarm point. The Performance Verification test results shall be
            corrected for the difference between the actual HRSG Duct Burner
            Heat Input during Performance Verification and the 300 mmbtu/hr
            (LHV) basis.

                             PERFORMANCE GUARANTEES

                          (Apply to Single Power Block)

                  Net Electrical Output                462,320 kW

                  Net Heat Rate                        6,887 BTU/kWH (LHV)

                  Maximum HRSG Duct Burner Heat Input  300.0 MMBtu/hr (LHV)

                          MINIMUM PERFORMANCE GUARANTEE

                  Net Electrical Output                439,204 kW

                  Net Heat Rate                        7,231 BTU/kWH (LHV)

2.2         Performance Bonus

            The "Power Block Bonus Performance Test" shall mean the test of each
            Power Block independently to demonstrate the Power Block's
            compliance with the Performance Bonus for Net Electrical Output and
            Net Heat Rate. The Power Block test shall consist of two (2)
            combustion turbines, associated HRSGs and steam turbine operating at
            base load and steady state conditions, chillers on, duct burner on
            at maximum allowable duct burner heat input, and air cooled
            condenser fans operating to maintain the STG backpressure below the
            alarm point. The Maximum HRSG Duct Burner Heat Input shall not be
            exceeded regardless of ambient temperature or Power Block
            capabilities.

Exhibit A                                                               10-13-04

                                  Page 37 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

                         PERFORMANCE GUARANTEE FOR BONUS

                          (Apply to Single Power Block)

                  Net Electrical Output                 583,000 kW

                  Net Heat Rate                         6,940 BTU/kWH (LHV)

                  Maximum HRSG Duct Burner Heat Input   524 mm btu, subject to
                                                        any mass flow
                                                        limitations due to
                                                        ambient conditions

2.3         Electrical Output

            The guaranteed Electrical Output of a Power Block shall be as
            specified in the Agreement adjusted to the Guaranteed Performance
            Conditions for Performance Guarantees, based on manufacturer and
            Test Contractor-supplied correction curves.

            Electrical Output is the sum of the power produced by the CTGs and
            the STG, less the auxiliary loads to run Power Block equipment and
            electrical losses in GSU transformers, interconnecting transmission
            lines, auxiliary transformers, and Auxiliary Systems and Facilities.

            For determination of output for the guarantee, the net electrical
            output of the Power Block shall be measured at the electric power
            revenue metering equipment located on the plant Site, which Owner
            shall provide at the high side of the main step-up transformers.
            Owner shall be responsible for calibration of the power revenue
            metering equipment and shall provide Contractor with calibration
            data sheets prior to testing.

2.4         Heat Rate

            The guaranteed Heat Rate of the Facility shall be as specified in
            the Agreement adjusted to the Guaranteed Performance Conditions for
            Power Block Guarantees, based on manufacturer and Test
            Contractor-supplied correction curves.

            Heat Rate is the total fuel consumed in the CTGs and duct burners
            divided by the Net Electrical Output of the Power Block. Fuel
            consumption used in determining Heat Rate is based on the lower
            heating value (LHV).

            The fuel consumption of the Power Block shall be determined from the
            mass flow measured downstream of the gas treatment equipment for
            each turbine and the LHV of the samples that shall be taken during
            testing. This meter shall meet AGA Report #3. Duct firing gas flows
            shall be determined using gas flow metering located in the gas line
            to each HRSG. In the event that Contractor discovers a discrepancy
            in the readings from the natural gas revenue meter during the
            preparation for Verification Testing, Owner shall be notified. The
            fuel consumption of the Power Block shall be determined from the
            following method.

            The mass flow calculation based on pressure drop across the
            GE-supplied gas flow orifices to each of the gas turbines. Duct
            firing gas flows shall be determined using gas flow

Exhibit A                                                               10-13-04

                                  Page 38 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

            metering located in the gas line to each HRSG. AGA Report #3
            methodology shall be used, including the gas constituent analysis to
            calculate flow.

2.5         Auxiliary Loads

            The Power Block Performance Test and Power Block Bonus Performance
            Test output and heat rate are calculated with all ACC fans in
            operation at high speed. Auxiliary loads will be adjusted to reflect
            any operation of the fans at low speed or off-line during the
            performance tests.

            The expected Auxiliary Electrical Loads for the guarantee ambient
            conditions are tabulated in Attachment 17. Auxiliary loads include
            all loads common to both blocks plus the auxiliary load of the block
            being tested. Water treatment system and auxiliary boiler system
            will be turned off during the performance test.

2.6         Guaranteed Performance Conditions for Electrical Output and Heat
            Rate

            The actual Performance Verification results shall be adjusted to the
            following Guaranteed Performance Conditions for Electrical Output
            and Heat Rate.

2.6.1       Site Conditions

                  Barometric Pressure:            13.55 psia

                  Ambient Temperature:            103 degrees F

                  Relative Humidity:              19.6%

                  Elevation:                      2,228 ft

2.6.2       Operating Conditions

                  Power Factor:                   0.85 lagging

                  Blowdown:                       0 %

                  Performance fuels:              Per Attachment 8

                  Gas Turbine Operating Hours:    Performance Degradation shall
                                                  apply per GE's guarantee basis

                  Steam Turbine Backpressure:     Per GE's GEK-111038a, August
                                                  2004 Alarm Limits

                  Cooling Water temperature to
                  Generator Coolers:              105 degrees F (Max.)

Exhibit A                                                               10-13-04

                                  Page 39 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

2.7         Conduct of Verification

            Each Power Block Performance Verification shall be conducted using
            installed plant permanent instrumentation where practical. The
            performance verification plan shall be in general accordance with
            ASME PTC 46 "Performance Verification Code on Overall Plant
            Performance.

            Each Power Block Performance Verification shall consist of a series
            of four (4), one-hour verification runs applied to each power block
            (2x1). A minimum of one-half hour of Facility operation shall be
            required prior to four (4) one hour verification runs. The four (4)
            one hour verification runs shall be completed over a period not to
            exceed forty-eight (48) consecutive hours. Results of the four (4)
            one hour verification runs shall be averaged per Performance
            Verification Procedure.

            Verification readings (6 minimum) shall be taken at least once every
            10 minutes during each of the verification runs and the average
            shall be calculated.

            Grab Samples taken at the gas metering station, or downstream of the
            gas treatment equipment shall be sent to a lab for independent
            analysis to determine the fuel heating value. The Grab Samples shall
            be taken at least once per verification run with a backup. The fuel
            heating value shall be determined by the averaged readings from the
            Grab Samples. Adjustments to the performance calculations due to
            variations in the fuel analysis shall be defined in the Performance
            Verification Procedure.

            Operation of the Facility during Performance Verification is the
            responsibility of Contractor, including supervision of Owner's
            operation and maintenance personnel engaged in the validation of the
            Facility and coordination of all on-site logistical activities in
            support of Performance Verification.

            Owner is responsible for liaison with the local utility, or other
            entity responsible for the electrical transmission and distribution
            system that the facility exports power to, and environmental
            authorities as required during Performance Verification.

            Owner is responsible for coordinating the delivery of natural gas
            for and the associated sale of electricity produced during
            Performance Verifications.

2.8         Verification Procedures

            Performance Verification Procedures developed shall include the
            following:

                  -     Administrative Procedures

                  -     Coordination procedures with Owner and Owner's
                        Operations and Maintenance group

                  -     Correction methods to adjust for actual conditions which
                        are different from the basis for overall performance
                        guarantees stated above

                  -     Sample data and calculation sheets

Exhibit A                                                               10-13-04

                                  Page 40 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

                  -     A list of instruments that shall be used to collect data
                        for the verification and their corresponding
                        identification tags and their respective accuracy

                  -     Calibration data for all instruments designated for use
                        in the test.

            Owner shall have the right review and approve the Verification
            Procedures per the Agreement.

2.9         Acceptance Criteria

            The Electrical Output and Heat Rate for the complete Moapa Energy
            Facility (4X2) shall be verified by applying the Performance
            Verification procedure to each individual Power Block (2X1). Each
            Power Block (2X1) shall independently meet all Agreement obligations
            for Electrical Output and Heat Rate Guarantees.

            All guaranteed results stated shall be met while not exceeding the
            emissions values stated in the Moapa Energy Facility Air Permit
            (Authority to Construct dated 6-3-04), Tables II-B-1 and II-B-3.

            Common loads and the measuring procedures shall be described in the
            Facility Performance Verification Procedures. Temporary and
            permanent instruments will be utilized to measure the common
            auxiliary loads during the first power block (2X1) Performance
            Verification and during the second power block (2X1) Performance
            Verification.

2.10        Deadband Applied to Performance Guarantees

            A plus or minus one (1.0%) percent deadband per the Agreement shall
            be applied to the Performance Guarantee prior to comparing the Power
            Block Performance Test corrected net output and net heat rate
            results with the guarantees. No other test uncertainty adjustment to
            the test results shall be allowed.

2.11        Deadband Applied to Performance Bonus

            No deadband will be applied to the Performance Bonus values under
Section 2.2.

3.0         THREE DAY RELIABILITY TEST

            The Three (3) Day Reliability Test shall mean the test to
            demonstrate the reliability of the Power Block over a 72 hour period
            prior to Final Completion. Each Power Block shall operate during the
            Three (3) Day Reliability Test within the emission levels identified
            in the Air Permit (Authority to Construct dated 6-3-04). The Three
            (3) Day Reliability Test shall demonstrate full load reliability
            during the test period. The operating time during Performance
            Verification Testing may be included in the Reliability Test. The
            protocol for the Three (3) Day Reliability Test shall be as follows:

Exhibit A                                                               10-13-04

                                  Page 41 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

3.1         Reliability Test

            -     After the Power Block has reached a stable condition at base
                  load with the CTG's at 100% load, with chillers on and duct
                  burner firing (or as otherwise mutually agreed), the Three (3)
                  Day Reliability Test shall begin.

            -     The Power Block shall operate for seventy-two (72) hours under
                  the above condition.

3.2         Reliability Factor

            The 72 hour Reliability Test will demonstrate the ability of each
            Power Block to operate continuously for 72 hours at or near 100%
            load on the gas turbines with chillers on and duct firing on or as
            otherwise mutually agreed. The acceptance criteria shall be that the
            Power Block runs normally and continuously in its normal manner and
            mode, in accordance with Prudent Industry Practice, and in
            compliance with applicable permits (taking into consideration any
            variances or waivers, if applicable) for 72 hours at a minimum of
            95% capacity factor of the maximum Power Block capacity (adjusted
            for ambient conditions and not exceeding manufacturer's
            limitations), while in compliance with the Air Permit (Authority to
            Construct dated 6-3-04) emissions criteria.

            The 72 hour Reliability Test acceptance criteria is to generate a
            net electrical output equal to or greater than a capacity factor of
            95% of the maximum Power Block capability (adjusted for ambient
            conditions and not exceeding manufacturer's limitations), for a
            continuous period of 72 hours. If a 95% capacity factor for the
            entire 72 hour period is generated prior to the completion of the 72
            hour period, the test has been successfully passed.

3.3         Acceptance Criteria

            The Three (3) Day Reliability Test shall be satisfied when the Three
            (3) Day Reliability Test was conducted in accordance with the Three
            Day (3) Reliability Test Procedure and the Reliability Factor is at
            least 95%.

Exhibit A                                                               10-13-04

                                  Page 42 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

4.0   ENVIRONMENTAL COMPLIANCE TESTS

      The Environmental Test Contractor is responsible for completing all CEMS
      certification tests and preparing the certification application required
      under Part 75 of Title 40 of the Code of Federal Regulations for Owner to
      submit to the appropriate agencies.

4.1   Compliance Tests

            -     The exhaust gas emissions during normal base loaded operation
                  exiting the HRSG stack shall not exceed the limits established
                  in the Air Permit (Authority to Construct dated 6-3-04),
                  tables II-B-1 and II-B-3.

            -     Facility emissions verification shall be conducted to
                  demonstrate that the Air Permit (Authority to Construct dated
                  6-3-04) requirements have been satisfied. The Facility
                  emissions verification shall be conducted in accordance with
                  the applicable EPA methods by a third party that is certified
                  to conduct emissions verification.

            -     The Environmental Test Contractor shall develop the Facility
                  emission verification protocol.

            -     Contractor shall have met all contractual obligations relative
                  to air emissions if the results of the Power Block and
                  Facility emissions verification indicate air emissions are at
                  or below the emissions levels in tables II-B-1 and II-B-3 of
                  the Air Permit (Authority to Construct dated 6-3-04) during
                  normal base load operation.

5.0   UTILITY ACCEPTANCE TESTS

      Contractor shall permit Electric Interconnection Utility representatives'
      access to the Plant to observe functional testing of communications,
      metering and control.

C.          TRAINING PROCEDURES

1.0   OPERATOR TRAINING BY CONTRACTOR

      Contractor shall be responsible for providing training for Owner's
      operators to the extent that such training was purchased by Owner under a
      Major Equipment Contract and assigned to Contractor under the Agreement.
      The training program

Exhibit A                                                               10-13-04

                                  Page 43 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

      shall be for a maximum of 35 people. The training program shall include
      the following:

            -     To the extent provided from an assigned Major Equipment
                  Contract supplier, classroom training covering the process,
                  mechanical, electrical and control systems of the CTGs, HRSGs,
                  STGs shall be provided. The Contractor shall coordinate the
                  schedule for such training directly with the supplier.

            -     DCS training covering the DCS hardware, software and controls
                  systems.

      Contractor shall provide hands-on training for the Operators during
      equipment and system commissioning, provided that Owner coordinates such
      activities with Contractor without causing Contractor a delay in the
      Contract Detailed Schedule.

2.0   OPERATOR TRAINING BY OWNER

      Owner shall provide and coordinate all formal operator classroom training.
      Owner will train the Operators in the following areas:

            -     Systems operations overview covering the Power Plant and
                  Facility operating philosophy utilizing the P&IDs and plant
                  operating instructions

            -     CEMS training covering process, electrical and control systems

            -     Plant electrical systems

            -     Balance of Plant (BOP) equipment and systems

D.          FACILITY ASSESSMENT

1.0   PURPOSE

      Contractor shall develop and maintain the Facility Assessment effort
      during the 90-Day True-Up period as defined in the Agreement. Contractor
      shall develop the equipment inspection packages, lead the equipment
      inspections, lead the effort for inventory of materials on Site to be
      installed, and prepare recommended Corrective actions plans in accordance
      with Attachment 14.

Exhibit A                                                               10-13-04

                                  Page 44 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

      Attachment 15 identifies all materials and equipment determined to have
      been previously delivered to the Site and maintained in good and working
      order. Attachment 14 and 15 will be used during the Facility Assessment
      effort to conclude determine missing, damaged or deteriorated components
      and materials.

Exhibit A                                                               10-13-04

                                  Page 45 of 46

<PAGE>

Exhibit 10.4

                                    EXHIBIT A
                                  SPECIFICATION

E.          ATTACHMENTS

    1.0     SITE PLAN AND PLOT PLAN
    2.0     PROCESS FLOW DIAGRAMS AND P&IDS
    3.0     EQUIPMENT LIST
    4.0     ELECTRICAL ONE-LINE DIAGRAMS
    5.0     FIRE PROTECTION DESIGN CRITERIA
    6.0     RAW (WELL) WATER ANALYSIS
    7.0     PERFORMANCE VERIFICATION PLAN
    8.0     PERFORMANCE FUEL - NATURAL GAS ANALYSIS
    9.0     STRUCTURAL DESIGN CRITERIA
    10.0    ELECTRICAL DESIGN CRITERIA
    11.0    WATER SYSTEMS DESIGN CRITERIA
    12.0    BUILDING PLANS
    13.0    INTERFACE PLAN (OWNER/CONTRACTOR INTERFACE POINTS)
    14.0    ASSESSMENT EFFORT
    15.0    LIST OF MATERIAL AT SITE
    16.0    PLANT MANUAL
    17.0    AUXILIARY LOAD LIST (PERFORMANCE GUARANTEE / PERFORMANCE BONUS)
    18.0    AIR PERMIT (AUTHORITY TO CONSTRUCT)

Exhibit A                                                               10-13-04

                                  Page 46 of 46