TRANSMISSION LINE & SUBSTATION PROJECTS COMPANY: …

TRANSMISSION LINE & SUBSTATION PROJECTS

COMPANY: ENTERGY SERVICES, INC.

CUSTOMER: NRG POWER MARKETING LLC

FACILITIES STUDY EJO # F4PPLA0303 EJO # F4PPGS0427 EJO # F4PPGS0428

ICTT-2008-072 ICTT-2008-073 ICTT-2008-074

TRANSMISSION SERVICE FACILITY STUDY

OASIS 1559579, 1559580, AND 1559581

Revision: 0

Rev Issue Date Description of Revision Prepared By

Project Manager

A 9/23/08 Draft for Engineering input Bryan McCarty

Charles Newell

B 10/2/08 Ready for Construction input Bryan McCarty

Charles Newell

C 10/15/08 Issue to Project Development Bryan McCarty

Charles Newell

0 10/24/08 ICT Determines Upgrade Classification English Cook

Jody Holland

NRG OASIS 1559579, 1559580, & 1559581 Facilities Study

TABLE OF CONTENTS

1. PROJECT SUMMARY ........................................................................3

1.1. Background and Project Need............................................................................... 3 1.2. Scope Summary.................................................................................................... 3 1.3. Cost Summary....................................................................................................... 4

2. SAFETY AWARENESS ......................................................................4

3. GENERAL ASSUMPTIONS................................................................4

4. SCOPE OF WORK..............................................................................5

4.1. Build a 230kV transmission line between Loblolly and Hammond 230kV substations ............................................................................................................ 5

4.2. Re-energize the idle Danville-Winnfield 34.5 kV line to covert to 115kV and convert the existing Danville-Winnfield 115kV line to 230kV operation ................. 8

4.3. Install a 12Ω reactor at McAdams ......................................................................... 9 4.4. Upgrade the Montgomery-Clarence 230kV transmission line ............................. 12 4.5. Winnfield 230kV Substation: Install line bay........................................................ 13 4.6. Danville 230kV Substation: Install line bay.......................................................... 16 4.7. Coly Substation: Terminate new 230 kV line and add new 230 kV breaker ........ 19 4.8. Hammond Substation: Terminate new 230 kV line and add new 230 kV breaker22 4.9. Loblolly Substation .............................................................................................. 25 4.10. Fairgrounds Substation ....................................................................................... 25

5. COST.................................................................................................25

6. SCHEDULE.......................................................................................26

6.1. Project Definition ................................................................................................. 27 6.2. Design, procurement and construction:............................................................... 27

7. RISK ASSESSMENT ........................................................................27

8. CONFIRMED RESERVATIONS........................................................28

9. PRE-888 TRANSACTIONS...............................................................33

10. STUDY QUEUE.................................................................................34

11. ATTACHMENTS ...............................................................................36

A. Table of Acronyms.......................................................................................... 36

B. One Line Drawings ......................................................................................... 36

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1. PROJECT SUMMARY

1.1. Background and Project Need The purpose of this Facilities Study is to determine the availability of transfer capability across Entergy’s transmission system from Louisiana Generating LLC (LAGN) to Louisiana Generating LLC (LAGN), to evaluate the NRG Power Marketing request for up to 500MW of yearly network transmission service. The time period for this transfer is from 5/1/2010 until 5/1/2015. The direction of the transaction is LAGN to LAGN. This study was performed on the latest available 2010-2015 summer and winter peak models, using PSS/E and MUST software by Power Technologies Incorporated (PTI). The facilities study identifies any transmission constraints resulting from the requested power transfer. The facilities study also includes cost estimates to correct any transmission constraints. 1.2. Scope Summary The Facilities Study has identified some transmission constraints. The constraints can be addressed in the following manner:

1.2.1. Build a 230kV transmission line between Loblolly and Hammond

230kV substations Constraints were identified (see below) for this transmission service request which will be alleviated by the Loblolly-Hammond 230kV line project, which is included in the 2008 ICT base plan. This project has an expected in service date of 2012; however, thermal constraints are seen during 2010. Transmission service cannot be granted until this upgrade has been completed. No acceleration of this project is available.

Thermal Overloads Limiting Element Contingency Element Gypsy-Fairview-Madisonville 230kV French Settlement-Sorrento 230kV

Frankin-McKnight 230kV

Gypsy-Fairview-Madisonville 230kV Front Street-Michoud 230kV Gypsy-Fairview-Madisonville 230kV Front Street-Slidell 230kV Gypsy-Fairview-Madisonville 230kV French Settlement-Sorrento 230kV Gypsy-Fairview-Madisonville 230kV Richard-Wells 500kV

1.2.2. Re-energize the idle Danville-Winnfield 34.5 kV line to 115kV line and

convert the existing Danville-Winnfield 115kV line to 230kV operation

The Winnfield 230/115kV autotransformer overloads for the loss of the Montgomery-Clarence 230kV transmission line. This constraint is alleviated by re-

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energizing the idle Danville-Winnfield 115kV line and converting the existing Danville-Winnfield 115kV line to 230kV operation. 1.2.3. Install a 12Ω reactor at McAdams

The McAdams 500/230kV autotransformer overloads for the loss of the Choctaw-West Point 500kV transmission line. A 12Ω reactor, rated at 2400A, is required to be placed at the McAdams substation. Under the switching scheme, if the flows across the McAdams 500/230 kV autotransformer exceed 100%, a breaker in a circuit parallel to the reactor will open, leaving only the reactor in the circuit. The reactor will reduce flow on the McAdams 500/230 kV autotransformer.

1.2.4. Upgrade the Montgomery-Clarence 230kV transmission line

The Montgomery-Clarence 230kV transmission line overloads for the loss of the Montgomery-Winnfield 230kV transmission line or the Winnfield 230/115kV autotransformer. It is required that the Montgomery-Clarence 230kV transmission line be upgraded from a capacity of 414MVA to at least 423MVA. This line is owned by Entergy (~7 miles) & CLECO (~5.8 miles). Each company will determine the cost to upgrade their portion of the line.

1.3. Cost Summary • The estimated Total project cost is $91,856,294 Full Financial. This does not

include Tax Gross Up which may apply.

• The ICT has assigned $73,742,842 Base Plan Upgrades and $18,113,452 as Supplemental Upgrades based on Attachment T of Entergy’s OATT.

2. SAFETY AWARENESS

Safety is a priority with Entergy. Safety will be designed into substations and lines. The designs will be done with the utmost safety for personnel in mind for construction, operation, and maintenance of the equipment. All employees working directly or indirectly for Entergy shall adhere to all rules and regulations outlined within the Entergy Safety manual. Entergy requires safety to be the highest priority for all projects. All Entergy and Contract employees must follow all applicable safe work procedures. Should the work contained within this Facility Study be approved, a detailed Safety Plan will be formulated and incorporated within the project plan.

3. GENERAL ASSUMPTIONS • All permits will be attainable in a reasonable period.

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• Assume guying rights & space is available where needed. • Standard construction practices and equipment will be used. • No construction access issues. • Upon receipt of formal approval from customer authorizing design and

construction, Entergy will prepare a detailed project execution plan. • Assume upgrade of CLECO owned portion of Montgomery-Clarence 230 kV

line will not impact Entergy’s construction schedule

4. SCOPE OF WORK

4.1. Build a 230kV transmission line between Loblolly and Hammond 230kV substations Since the T/Line crosses two jurisdictions, a Dead-End pole will be installed at the border. This demarcation is at Louisiana highway 441. Upon completion of this project, a new 230kV line from Coly to Hammond is created. The existing termination of 69kV line L-200 into Loblolly is removed. For the most part, the center line location is practically completed; however, until all of the survey is completed and the plats of the properties are drawn, the center line may need minor modifications. This is expected to be completed by the Summer of 2008. The structures used for this line is the delta configuration with brace post insulators. A 24 fiber OPGW shield wire will be installed throughout. For some applications where possible, consideration will be given during the detailed design for using reduced pole lengths by using a decreased distance between the shield wire and top conductor from the typical 19 ft to 12 ft. There may be financial savings by employing this strategy. Minimum provisions to allow Distribution in future to install a 69kV line from Loblolly to Fairgrounds will be provided. The provisions include stringing the new 230kV conductors in a vertical configuration on the north side of the poles, installing slightly taller poles, and using longer bolts for the insulator attachment on the poles. We will also add a fiber splice point on the new transmission line as close to Fairgrounds as possible to allow for future fiber connectivity. In future, when the 69kV line is required, all that needs to be done for the first section out of Loblolly are conductors and insulators. No new ROW is required, except for the stand alone section going north from Fairgrounds.

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GSU/LA (Loblolly-Hwy 441): 1) 13.1 miles-Built with 1272 ACSS (1956 amps @175 °C) and OPGW at 230kV. This conductor exceeds Planning’s requirement of 1766 amps. 2) 20-Steel Structures (All Dead-Ends): Base plated w/base plated caissons. 3) 94-Concrete Structures (All Tangents and small angles): Direct embedded.

LP&L (Hwy 441-Hammond): 1)10.3 miles. Built with 1272 ACSS (1956 amps @175 °C) and OPGW at 230kV. This conductor exceeds Planning’s requirement of 1766 amps. 2) 18-Steel Structures (All Dead-Ends): Base plated w/base plated caissons. 3) 73-Concrete Structures (All Tangents and small angles): Direct embedded. 4.1.1. Coly-Loblolly 69kV line The existing line to Loblolly will be double circuited with new 69kV to replace the converted section. This will require the installation of 10 steel self-supported dead-end structures at 69kV (8 single pole and 2 three pole). Also 5 of the existing tangent between Coly to Loblolly will need to be replaced with taller concrete direct embed structures GSU/LA (Coly-Loblolly) section: 1) 2.9 miles built with 666 ACSR (885 amps at 100 C) and 7 NO.7 at 69kV 2) 10 - Steel Structures (All Dead-Ends): Base plated w/base plated caissons 3) 5-Concrete Structures (All Tangents and small angles): Direct embedded

Transmission line construction

Organization:

• All construction activities will be managed by Entergy personnel. Dependent on when this project is approved and actually constructed it may be deemed necessary to solicit contract personnel to aid in the construction oversight.

Construction Standards:

• All applicable Entergy and/or Manufactures standards will be adhered to,

these standards will be part of all requests for quotes, and construction packages.

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Project Execution

Constructability Reviews:

Formal Constructability Reviews will be performed before the Site, Foundation, Electrical, Relay, and Transmission Line packages are issued for construction. These reviews will typically be done at approximately 50% of package completion. Depending on the package complexity and number of issues raised at the 50% review, a second constructability review (at approximately 90% of completion) may be necessary. For T/Line design packages it is 75% to 80%. The reviews should include the design engineer and construction lead at a minimum. The AM Grid Supervisor and/or their designee will also be included in the Relay package reviews. The PM, construction supervisor, and other team personnel may also be invited. All reviews should be documented (meeting minutes, e-mail, etc.).

Sequenced Construction Plan:

Substation construction and installation activities will be executed simultaneously with the Transmission Line construction. All components that can be checked out and commissioned will be completed as each line segment is completed. The Transmission Line construction is dependent on the Right of Way clearing, therefore the Transmission Line construction will start once there has been sufficient progress with the clearing activities. The most methodical approach for sequencing is to install the OPTGW on line L-360 between Coly and Loblolly before any subsequent outages are required for the remainder of the project. Simultaneously construction of foundations at Hammond and Coly can be underway. The next logical step would be to construct the 230kV circuit for line L-200. (Note: Provisions will be made to install a double circuit 69kV line with L-200 to a point north of Fairgrounds Substation. This will be implemented to facilitate future expansion.) This will eventually establish a 230kV circuit from Hammond to Loblolly as a redundant circuit with the existing line L-360. This sequencing will allow for the required outages to complete the construction and installation activities at Coly, as well as to tie into the existing line L-200 that is now operating as a 69kV circuit.

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Loblolly Fairgrounds

Coly

Existing 69kV line

New 69kV conductors

New 230kV line

Legend:

Hammond

Lay-Down Areas:

Laydown yards will be strategically located in areas that support the Transmission Line construction. All attempts will be made to find the most economic and beneficial locations. One possible candidate identified at this time would be the Fairgrounds Association property. It will be necessary to fill, rock, fence, and provide positive drainage to all areas identified. As soon as project funding is approved, Construction Management and ROW will establish access routes into the ROW. Upon completion of phase 1 of this project, Construction Management and ROW will establish access routes into the ROW.

Site Security:

Security guards will be stationed at all laydown yards when construction personnel are not present throughout the duration of construction as deemed necessary.

4.2. Re-energize the idle Danville-Winnfield 34.5 kV line to covert to 115kV and convert the existing Danville-Winnfield 115kV line to 230kV operation The existing line between Danville and Winnfield is constructed on single pole, double circuit steel structures with davit arms. The structures are framed (vertical spacing) for double circuit 230kV construction. The east circuit has 666 ACSR conductor and is insulated and for 230kV. The west circuit has 4/0 ACSR conductor with 34.5kV insulation. Several spans of the de-energized 34.5kV are down or missing. The required ampacity for both the new re-energized 115kV side

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(existing de-energized 34.5kV) and the converted 230kV side (existing 115kv) is 883 amps. The conductor and insulators on the existing energized 115kV side will be adequate to meet the upgrade to 230Kv. However, new structures will be required at Danville and Winnfield to cut the line into the new 230kV bays. At Dodson, which is between Winnfield and Danville, the 230kV line will need to be routed around the station. Two new structures will be required at the LAGen (Jeld-Wen) station on the converted 34.5kV (new 115kV) side. The LAGen station will remain on the 115kV circuit and will need to be fed from the 34.5kV upgrade. All of the new structures will be direct embedded (concrete) poles, guyed in the full tension direction and self supporting in the slack / reduced tension direction. If this project is executed, swapping the 230kV and 115kV circuits should be investigated for possible savings. (Both circuits will have 666 ACSR conductor with an ampacity of 883 amps). The wire for the 34.5kV upgrade will be 666 Flamingo. The existing 34.5kV insulators and 4/0 ACSR conductor will be removed from the west circuit and replaced with new 161kv suspension insulators and 666 ACSR conductor. The existing shield wire will remain in place. However, several new spans of 7#7 shield wire will be required at the substations for the routing into the new bays and for the run around at Dodson.

Quantity Material Description *Lead Time (weeks)

15 ea Concrete poles 18 648 ea Insulators 16

287k lbs 666 ACSR Flamingo 18 *As of 10/17/08

Line Construction (Methodology, Duration of Construction, Outages):

Line construction will involve three line sections: Winnfield to Jeld-Wen, Jeld-Wen to Dodson, and Dodson to Danville with an outage being required on each one. Methodology will include mobilizing line contractor, receiving materials, taking outage, and performing work as detailed in the above work scope. The total construction duration is estimated to be 26 weeks.

4.3. Install a 12Ω reactor at McAdams The following work is required:

Install one 12 ohm reactor with a breaker in parallel with logic to detect follow of power through 500/230 kV transformer opening breaker allowing flow of power through reactor as shown on M3920EA2 and station oneline M3920SO5. Site: Site work will consist of replacing any displaced limestone around new equipment.

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Foundation:

Approximately 275 cu. yds. of concrete will be used for the following foundations • One (1) 500kV CVT equipment pedestal foundation • One (1) 230kV Breaker foundation • Three (3) 230kV CVT equipment pedestal foundations • Three (3) 230kV CT equipment pedestal foundations • Thirty (30) 230kV High elevation bus support foundations • Twenty-four (24) 230kv Low elevation bus support foundations • Eight (8) 230kV High elevation switch support foundations • Two (2) 230kV Full Tension deadend foundations • Three (3) 230kV Reactor foundations Install conduit to all equipment and install grounding leads to all new equipment and structures. Electrical: Extend the 230kV bus and install 230kV two bays as shown on M3920EA2 and station oneline M3920SO5. The reactor bay will include 3 reactors and 2 isolating disconnect switches. The by pass bay will include a breaker and 2 isolating disconnect switches. The following equipment will be required: • Three (3) 230kV 12 ohm reactors • Two (2) 230kV full tension dead ends • Four (4) 230kV disconnect switches • Four (4) 230kV Switch supports • One (1) 230kV Breaker • Three (3) 230kV CVT equipment pedestals • Three (3) 230kV CT equipment pedestals • Thirty-nine (39) 230kV High elevation bus support structures • Twenty-four (24) 230kv Low elevation bus support structures • One lot of buswork and insulators • One lot of strung buswork and shieldwire • Install One (1) 500kV CVT equipment pedestal

Long Lead Material – McAdams Substation


3 12 ohm reactors 36 1 230kV Breaker 24

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4 230kV disconnect switches 18 1 lot Steel structures 20 1 lot Insulators 16

*As of 10/17/08 Relaying: 500/230kV Autotransformer: • Modify existing Autotransformer Differential Relay Protection. The new

protection panel will use SEL 387 differential protection for primary and an Nxtphase T-pro protection backup

• Install one (1) 500kV CVT and Junction Box Reactor Protection/Control: • Install two (2) panels with SEL 311L differential protection for primary and an

SEL 387 differential protection backup • Install three (3) 230kV CVT and Junction Box • Install three (3) 230kV CT and Junction Box Breaker Protection/Control: • Install one (1) Breaker Control Panel The panel will use an SEL 351 • Install shielded control cables to breaker. • Install an indoor potential /current distribution box. Control House Equipment: • Upgrade RTU And Termination Cabinet Status cards & Control cards • Install one (1) Communications Processor, Orion 5r • Marshalling Cabinet • One Lot of ADSS Fiber Optic – Reactor Protection • One Lot of Control Cable • One Lot of Shielded Control Cable

Long Lead Material – McAdams Substation Relay


1 230 KV Breaker control panel 16 3 Diff Panels 16 3 230 kV CVT 24 1 500 kV CVT 24

*As of 10/17/08 Relay Settings: 500/230kV Auto-transformer: • Settings will need to be derived for one SEL 387 transformer differential for primary protection and one Nextphase T-pro protection for backup. Reactor Protection/Control:

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• Settings will need to be derived for two SEL 311L differential protection for primary and one SEL 387 differential protection for backup. Breaker Protection/Control: • Settings will need to be derived for one Entergy standard breaker control panel consisting of one SEL 351-7. RTU configuration: • Configure RTU for new hardware and cards • Configure Orion communication processor. Construction strategy and outage requirements: The station will not have to be expanded but some crushed limestone will be replaced in the area where foundation work will be performed. Foundation work will probably not require any outages in the 230 kV yard in order to complete but this could change depending on final designs. A short outage on the 500 kV ring bus and possibly the autotransformer may be required in order to install one foundation in the 500 kV yard. The major portion of electrical and relay work can be performed without outages but an extended outage to the existing transformer bank will be required in order to tie-in new construction and to do final relay check-out and commissioning.

4.4. Upgrade the Montgomery-Clarence 230kV transmission line

The 230kV line between Montgomery and Clarence is owned by Entergy and CLECO. The Entergy owned portion starts at Montgomery and runs for approximately 7.04 miles to the northwest, up to structure #62. The required capacity of the line as stated in the solution set is 423MVA (1063 amps @230kV). The first four (4) spans out of Montgomery, up to structure #3 (0.34 miles) have double bundled 795 ACSR conductor and will not require upgrading. The remaining 6.7 miles of line are conductored with a single 795 ACSR “Drake” conductor and will require an upgrade to a 954 ACSR “Cardinal” conductor (1108 amps) to meet the required ampacity. The line is supported on 53 non x-braced wood H-frames from structure #5 to structure #58 with one (1) wood three pole guyed angle at structure #48 in the run. Structures #4 and #59 are wood three pole guyed deadends. Structures #60, #61, and #62 are guyed aluminum towers. Structures #4, #48, #59, #60, #61, and #62 appear to be adequate and will not be replaced for this estimate. However, the insulators will be replaced on structures #4, #48, and #59 and the conductor hardware only will be replaced on structures #60, #61, and #62 In order to meet the required clearances and increased load, it is estimated that ten (10) of the 53 wood H-Frames will be replaced with x-braced concrete H-Frames and new suspension insulators. The remaining 43 H-frames will be modified by removing the existing conductor and shield wire cross arms and

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installing a steel x-brace, two (2) three foot long shield wire arms, braced post insulators on the outside phases and a v-string insulator on the center phase. Final quantities of structures to be replaced / modified will be determined once the project is approved during detailed line design. The two (2) existing 3#6 shield wires will be moved to the new arms or concrete H-frames.

Long Lead Materials – Montgomery-Clarence

Quantity Material Description *Lead Time

(weeks) 20 ea Concrete poles 18

174 ea Insulators 16 137k lbs 954 ACSR “Cardinal” Conductor 18

*As of 10/17/08

Line Construction (Methodology, Duration of Construction, Outages):

Methodology will include mobilizing line contractor, receiving materials, taking outage, and performing work as detailed in the above work scope. The total construction duration is estimated to be 13 weeks.

Line Capacity MVA Existing Line Rating 414 Required Line Rating (minimum)

423

Proposed Line Rating (based on equipment to be installed)

>423

4.5. Winnfield 230kV Substation: Install line bay

The following work is required:

Install new 230kV line bay for a line termination from Danville 230kV Substation. Extend the existing 230 kV operating bus and build new line bay. Site: The site has been developed with fence and limestone. The existing site provides enough space to install the new line bay. Limestone will be required to restore ground disturbed by movement of vehicles and foundation work.

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Foundations: Extend existing cable trough 48ft, poured in place. Install copperweld ground leads to the existing ground grid. Install the following foundations to facilitate the substation addition.

• Ten (10) 230kV Low elevation bus support foundations • Two (2) 230kV Breaker foundations • Five (5) 230kV High Elevation Switch support foundations • One (1) 230kV Full Tension Deadend foundations • Seven (7) 230kV Equipment support pedestal foundations • Four (4) yard lights

Electrical: Install new 230kV line bay for The Danville line termination per station oneline L0039S05. Expand the existing operating bus. Install a transfer bus and extend the two existing bays to the transfer bus. In Transformer bay #1 remove one bus support and install one breaker, one switch on existing switch structure and one switch on a new structure. Extend the bus to the new transfer bus. In existing line bay install one switch on a new structure and extend the bus to the new transfer bus. In the new line bay, install one breaker, three switches with structures, and one 10AS deadend structure. The following material is required for station expansion:

• Two (2) 230kV Breaker • Seven (7) 230kV Switches including one with ground • Six (6) surge arresters • One (1) 230kv 10AS deadend with bus support • Ten (10) 230kV Low elevation bus supports • Five (5) 230kV High Elevation Switch supports • Seven (7) 230kV Equipment support pedestals • Four (4) yard lights • One (1) lot bus work • One (1) lot insulators • REMOVE one (1) bus support

Relay: The existing autotransformer is fed from the operating bus with no breaker. This bay will have a new breaker installed to disconnect the autotransformer from the operating bus. A new breaker control panel will be used for this new breaker. A new line bay will be built with a new breaker for the new Danville line. This line will use DCUB line/breaker panel for protection. Once the operating bus is completed, it will have a new bus differential panel to protect it. The existing RTU is a D20, but must be upgraded to use the communications processor. The AC and DC panel are assumed to be adequate.

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• Install one (1) bus differential panel with SEL 487B as per Entergy standard.

• Install one (1) DCUB line/breaker panel as per Entergy standard. • Install one (1) breaker control panel with SEL 351-7 as per Entergy

standard. • Install one (1) line trap on the new Danville line. • Install one (1) line tuner on the new Danville line. • Install one (1) CCVT with carrier accessories on the new Danville

line. • Install one (1) single phase CCVT junction box on the new Danville

line. • Upgrade RTU motherboard to ME II. The status and control cards

are assumed to be adequate. • Install one (1) Communications Processor, Orion 5r. • One Lot of Control Cable

Communications and SCADA: The RTU will be upgraded with an ME II processor to accommodate the Orion 5r processor. New alarms and control points will need to be configured.

RTU configuration and settings: Settings for all new relays and surrounding area would be required as well as development of configuration for RTU for additional status, control and indications

Construction methodology and outages required: Grading work and fence expansion should not be required. Foundation work may require some short outages to existing autotransformer bank and/or line but this will depend on final foundation design. The majority of the electrical construction can be completed without outages. An extended outage will be required to tie-in new construction. Relay checkout will include new differential scheme and end to end checks on the new line to Danville.

Task Specific Assumptions:

• Fault current does not exceed 40kA • Control house does not require expansion.

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Long Lead Materials – Winfield 230kV Substation

*As of 10/17/08


1 230 KV Breaker control panel 16 1 Diff Panels 16 1 Breaker Panel 16 1 Line Trap 18 1 Line Tuner 18 1 230kV CVT 24 2 230kV Breakers 22 7 Disconnect switches 18

1 lot Steel Structures for buswork 20 6 Arresters 16

1 lot Insulators 14 1 lot Buswork 14

4.6. Danville 230kV Substation: Install line bay Convert the existing single bay to three breaker bays with a operating and transfer buses. Site: The site has been developed and fenced. The existing site provides enough space to install the new bays. 600 tons of limestone will be required to restore ground disturbed by movement of vehicles and foundation work and expand the existing rocked area to include the new bays and bus work. Foundations: Install Copperweld ground leads to the existing ground grid. Install the following foundations to facilitate the substation addition.

• Two (2) 230kV Breaker foundations • Seven (7) 230kV High Elevation Switch support foundations • Fourteen (14) 230kV Low elevation bus support foundations • Two (2) 230kV Full Tension Dead-end foundations • Ten (10) 230kV Equipment support pedestal foundations • Four (4) yard lights

Electrical: In order to install a new 230kV line from Winnfield, the Danville 230kV substation will have to be expanded to include an operating bus, a transfer bus, and three

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bays. To accomplish this, the existing 230kV termination for the Grambling 230kV line and 230/115kV autotransformer will have to be re-configured per station oneline L0436S05. In line bay #1, terminating the existing Grambling 230kV line, a new switch will have to be installed and the bay extended to both the new operating bus and transfer bus. In transformer bay #2, install one breaker, three switches with structures, including one ground switch, and a 10AS dead-end structure to terminate the autotransformer. In the third bay, terminating the new Winnfield 230kV line, install one breaker, three switches with structures, including one ground switch, and a 10AS deadend structure. The following material is required for station expansion:

• Two (2) 230kV Breaker • Seven (7) 230kV Switches including one with ground • Seven (7) 230kV High Elevation Switch supports • Fourteen (14) 230kV Low elevation bus supports • Two (2) 230kv 10AS deadend with bus supports • Ten (10) 230kV Equipment support pedestals • Six (6) surge arresters • One (1) lot bus work • One (1) lot insulators • Four (4) yard lights

Relay: The existing autotransformer is fed from a shared line breaker. A new bay will have a breaker installed and the autotransformer will be fed from here. The existing transformer differential currents will be moved to the new breaker. A new breaker control panel will be used for this new breaker. This will leave the existing breaker (R2629) to disconnect the existing Mt. Olive line from the operating bus. The existing 115kV bus potentials will be removed from the Mt. Olive line panel, and replaced by the new 230kV bus potentials. A new line bay will be built with a new breaker for the new Winnfield line. This line will use DCUB line/breaker panel for protection. Once the operating bus is completed, it will have a new bus differential panel to protect it. The existing RTU is a D20, but must be upgraded to use the communications processor. The AC and DC panel are assumed to be adequate.

• Install one (1) bus differential panel with SEL 487B as per Entergy

standard. • Install three (3) CCVT’s with carrier accessories for the bus potential. • Install an indoor bus potential distribution box. • Install an outdoor bus potential junction box made of stainless steel. • Install one (1) DCUB line/breaker panel as per Entergy standard. • Install one (1) breaker control panel with SEL 351-7 as per Entergy

standard. • Install one (1) line trap on the new Winnfield line.

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• Install one (1) line tuner on the new Winnfield line. • Install one (1) CCVT with carrier accessories on the new Winnfield

line. • Install one (1) single phase CCVT junction box on the new Winnfield

line. • The AC and DC panel are assumed to be adequate. • Upgrade RTU motherboard to ME II. The status and control cards

are assumed to be adequate. • Install one (1) Communications Processor, Orion 5r. • One Lot of Control Cable

Communications and SCADA: The RTU will be upgraded with an ME II processor to accommodate the Orion 5r processor. New alarms and control points will need to be configured.

RTU configuration and settings: Settings for all new relays and surrounding area would be required as well as development of configuration for RTU for additional status, control and indications

Construction methodology and outages required: Grading work and fence expansion should not be required. Foundation work may require some short outages to existing autotransformer bank and/or line but this will depend on final foundation design. The majority of the electrical construction can be completed without outages. An extended outage will be required to tie-in new construction. Relay checkout will include new differential scheme and end to end checks on the new line to Winnfield.

Task Specific Assumptions:

• Fault current does not exceed 40kA • Control house does not require expansion.

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Long Lead Materials – Danville 230kV Substation

*As of 10/17/08


1 230 KV Breaker control panel 16 1 Diff Panels 16 1 Breaker Panel 16 1 Line Trap 18 1 Line Tuner 18 4 230kV CVT 24 2 230kV Breakers 22 7 Disconnect switches 18

1 lot Steel Structures for buswork 20 6 Arresters 16

1 lot Insulators 14 1 lot Buswork 14

4.7. Coly Substation: Terminate new 230 kV line and add new 230 kV breaker

The scope of the Coly portion of this project includes reconnecting the existing 230kV line (L200) at 230kV between breakers 13485 and 13490. Terminating L200 at 230kV requires re-terminating the Auto #3 230kV tie to new position between breaker 21825 and a new 230kV breaker. Several foundations, bus supports and PT’s must be removed/located for the new Auto #3 termination. Site: The proposed scope will require minimal site work. Additional limestone will be required to dress the construction area of the site due to grounding attachments. Foundation Work: • Install one three phase bus support foundation (2 piers) • Install five single phase bus supports foundation • Install one 230kV CVT pedestal foundation (3 piers) • Install three 230kV CVT pedestal foundation (2 piers) • Install one 230kV breaker foundation • Install ground to new equipment per current Entergy grounding standard • Install two 2” sch. 40 PVC conduits from 500kV CVT to cable trench • Install six 2” sch. 40 PVC conduits from 230kV breaker to cable trench • Install two 2” sch. 40 PVC conduits from 230kV CVT’s to cable trench Electrical Work: • Relocate three 230kV bus supports • Relocate one 230kV three phase bus support • Relocate one 230kV CVT

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• Relocate jumpers, conductors, insulators and fittings for 230kV bus • Install one 230kV breaker • Install three 230kV CVT’s • Install two 230kV switches • Install jumpers, conductors, insulators and fittings for new 230kV bus • Install 2” flex conduit from conduit stub-ups to all electrical devices • Connect grounding pigtails to all electrical devices • Pull power, control, and signal cable to electrical devices per relay cable pull list Relay/ Settings/ Configurations Work: L-200 (GCB 21675) to Loblolly Substation is currently operated at 69kV but is rated for 230kV. The scope of this project is to remove this line from its current location, re-route it between existing breakers 13485 & 13490, operate the line at 230kV and extend the line to the Hammond Substation. One new standard line panel for fiber communication will be installed on this line as well. The telecommunication group will provide any additional associated fiber equipment. A new 69kV line will be built to Loblolly to maintain the current configuration. Current inputs from breakers 13485 & 13490 are presently connected as part of the autotransformer #3 differential scheme. These connections will be removed. The autotransformer #3 differential scheme will now include current inputs from breaker 21825 and the new 230kV breaker. With the addition of the new breaker, current inputs from breaker 21825 to L-711 relaying will be removed. The current input to the L-711 relaying will now come from the new 230kV breaker. The controls, breaker failure relays and ammeter for breaker 13485 are currently the Jaguar line panel. Also, the controls, breaker failure relays and ammeter for breaker 21825 are currently on the Moler line panel. These breakers are not associated with the lines their equipment is on. Therefore, the existing equipment associated with these breakers will be removed. New breaker control panels will be purchased for breakers 13485 and 21825. This will help prevent confusion for operations in the future. The existing D20 RTU has enough spare control and analog points for this project. Designer will need to purchase one new status card to accommodate the additional alarms points. The existing DC panel #5 has 1 spare 30amp breaker, 1 bad breaker and 3 blank positions. Existing DC panel #7 has 2 spare 30 amp breakers. The existing AC panel #6 has 4 spare 1-pole 50amp breakers, 2 spare 2-pole 70amp breakers and 2 spare 2-pole 100 amp breakers. In 2008, three 69kV breakers will be replaced. Some of the above mentioned DC breakers will be used for this job. The final design will specify if additional breakers are needed.

20


Details of Relay Work: • Purchase/design/install one (1) line panel with fiber communication - Entergy

standard panel with SEL 421 primary relay and SEL 311C backup relay for new the 230kV line to Hammond

• Purchase/design/install three (3) breaker control panels - Entergy standard panel with SEL 351 relay for breaker 13485, 21825 & the new 230kV breaker.

• Design/install one (1) 230kV breaker • Purchase/design/install three (3) 230kV CVT’s, relaying accuracy. • Purchase/design/install one (1) outdoor three phase CVT junction box. • Purchase/design/install one (1) indoor three phase CVT junction box. • Purchase/design/install one (1) SEL 2032 • Purchase/design/install one (1) GE Harris D20 S-card Relay Settings and Configuration: • SEL 421 primary line relay • SEL 311C backup line relay • SEL 351 RTU Configuration: • Configure one new S-card • Configure SEL-2032 Metering Work: No metering work required Construction: If this project is approved and enters the Transmission Business’s (EMCC) process for executing projects, there will be constructability reviews performed during the definition phase. These reviews will try to incorporate any known hazards from a safety perspective, as well as any obstacles that could/would be experienced during the construction and installation process. After receipt of the final design drawings and details for each discipline of work, a determination will be made to either perform a competitive bid process to award the work to an Entergy approved contractor, or to allow internal Entergy Resources to perform the work. The normal process would be to perform all of the site, foundation, grounding, and conduit work with a single source. Dependant on the final design a determination will be made to address any system outages that may be required to perform the installations of any proposed foundations. In the event that foundations or foundation modifications are required, efforts will be made to utilize low profile excavation equipment. This will enable the installation of any foundations that will

21


be under, near, adjacent to or in close proximity of energized conductors that could be identified as a safety risk. In the instances that this is not attainable, outages will be required. The disapproval of any outages could poses risk to all schedules. Upon completion of the site and foundation installations/removals including all associated conduit and grounding installations, Steel and Electrical installations as well as Protection & Control Installations will commence Required Outages (High Level): • L-200 outage for termination as 230kV (1 week) • T3 outage and bus outage to terminate L-200 (3 weeks) 4.8. Hammond Substation: Terminate new 230 kV line and add new 230 kV breaker Hammond Substation will involve adding a new Coly 230kV line. A new line bay will be installed. Site: • Remove existing capacitor bank foundations and possibly reuse one existing foundation depending on stub angle condition. • Install 6” crushed rock throughout the new line bay for maintenance and grounding purposes. Foundation Work: • Install three 230kV “CE” tower foundations • Install one 230kV breaker foundation • Install one 230kV “A frame” dead end foundation • Install three 230kV lighting arrester foundations • Install three 230kV CT’s foundations • Install three 230kV CVT’s foundations • Install grounding for new equipment per current Entergy grounding standards • Install one 2” sch 40 PVC conduit from “A frame” structure to cable trough • Install six 2” sch. 40 PVC conduits from one 230kV breaker to cable trough Electrical Work: • Install one 230kV dead end structure • Install three “CE” tower for switches • Install one 230kV breaker • Install three 230kV center side switches • Install one 230kV ground switch

22


• Install three 230kV CT’s • Install three 230kV CVT’s • Install three 230kV lighting arresters • Install jumpers, conductors, tubing, insulators and fittings from inspection bus to the operating bus • Install 2” flex conduit from conduit stub-ups to all electrical devices • Connect grounding pigtails to all electrical devices • Pull power, control, and signal cable to electrical devices per relay cable pull list • Space to install arresters, CT’s, CCVT’s is very limited; CT/PT combination units may be required to save space. Specific dead end tower detail to be determined based on line pull-off distance. Relay/ Settings/ Configurations Work: The scope of this project is to build a new 230kV line to Coly Substation and add one new 230kV breaker. Fiber will be installed on this new line and the associated fiber equipment (patch panel, channel bank, etc) will be provided by the telecommunications group. One new standard line/breaker panel for fiber communication will be installed. The new 230kV line from Coly to Hammond crosses jurisdictions from GSU-LA to ELI. Therefore, metering CT’s, PT’s and a metering panel will be installed at Hammond Substation. Panel space in the control house is sufficient for this project. The existing GE Harris D20 RTU has enough spare analog, alarm, and control points to accommodate this project. The D20M processor will need to be upgraded to the new D20ME processor. An SOC data circuit will be provided via fiber and connected to the RTU for SOC TRAKR and Inter-Service Billing purposes. The RTU will need to be configured to provide data to the SOC. The existing 230kV bus potential junction box in the control house is adequate to provide potential to the new line/breaker panel. The existing DC panel has 1 spare 30amp breaker, 2 spare breakers with sizes unknown and 6 blank spaces. The existing AC panel has 1 spare 30amp 1-pole breaker and 1 spare 50amp 2-pole breaker. At this time, a new 230kV Amite line project is underway. The relay designer must re-verify the need for additional AC and DC breakers after the completion of this project. The new Coly breaker must be tied into the bus differential scheme. One spare input to the new bus differential panel is available.

23


Relay Work: • Purchase/design/install one (1) line/breaker control panel for fiber communication

- Entergy standard panel with SEL 421 primary relay and SEL 311C backup relay for new the 230kV line to Coly and new 230kV circuit breaker protection.

• Design/install one (1) 230kV breaker • Purchase/design/install one (1) 3-phase outdoor CVT junction box. • Purchase/design/install one (1) 3-phase indoor CVT junction box. Metering Work: • Purchase/design/install three (3) 230kV CVT’s, metering accuracy • Purchase/design/install three (3) 230kV CT’s, metering accuracy • Purchase/design/install one (1) metering panel with one meter • Purchase/design/install one (1) metering junction box. Relay Settings and Configuration: • SEL 421 primary line relay • SEL 311C backup line relay RTU Configuration: • Install and configure new D20ME processor • Configure port for SOC Construction: If this project is approved and enters the Transmission Business’s (EMCC) process for executing projects, there will be constructability reviews performed during the definition phase. These reviews will try to incorporate any known hazards from a safety perspective, as well as any obstacles that could/would be experienced during the construction and installation process. After receipt of the final design drawings and details for each discipline of work, a determination will be made to either perform a competitive bid process to award the work to an Entergy approved contractor or to allow internal Entergy Resources to perform the work. The normal process would be to perform all of the site, foundation, grounding, and conduit work with a single source. Dependant on the final design, a determination will be made to address any system outages that may be required to perform the installations of any proposed foundations. In the event that foundations or foundation modifications are required, efforts will be made to utilize low profile excavation equipment. This will enable the installation of any foundations that will be under, near, adjacent to or in close proximity of energized conductors that could be identified as a safety risk. In the instances that this is not attainable, outages will be required. The disapproval of any outages poses a significant risk of schedule delays.

24


Upon completion of the site and foundation installations including all associated conduit and grounding installations, Steel and Electrical installations as well as Protection & Control Installations will commence Required Outages (High Level): • L-200 outage (1 week) • 230kV bus to install new breaker, switches, CT’s, CVT’s and switch racks (4 weeks) 4.9. Loblolly Substation No physical work will be required at Loblolly 69kV. The One-line drawing has been modified to reflect a line number change 4.10. Fairgrounds Substation No physical work required at Fairgrounds 69kV. The one-line drawing modified to reflect a line number change.

5. COST The ICT has reviewed and determined each required upgrade to be considered either a Base Plan Upgrade or a Supplemental Upgrade. For more information on cost responsibility for Base Plan and Supplemental Upgrades, see Attachment T to Entergy’s OATT. The costs shown in the table include overheads and AFUDC, but do not include tax gross up that may apply to the project.

Projected Costs in 2008 dollars w/o escalation

Description Estimated Completion

Year Total Cost 2008

Loblolly-Hammond 230 kV line 2012 $64,570,976 Danville-Winnfield 2010 $4,838,423 McAdams Reactor 2010 $6,560,004 Montgomery-Clarence 230 kV line 2010 $2,617,706

Winnfield 230 kV Substation 2010 $1,837,732

Danville 230 kV Substation 2010 $2,259,587

Coly-Loblolly 69kV line 2012 $3,997,183

Coly Substation 2012 $2,375,537 Hammond Substation 2012 $2,530,036

Loblolly Substation 2012 $269,110

Total with OH and excluding TGU

$91,856,294

25


ICT Cost Analysis

Project TOTAL Base Plan Supplemental Loblolly-Hammond 230 kV line $64,570,976 $64,570,976 Danville-Winnfield $4,838,423 $4,838,423

McAdams Reactor $6,560,004 $6,560,004

Montgomery-Clarence 230 kV line $2,617,706 $2,617,706 Winnfield 230 kV Substation $1,837,732 $1,837,732 Danville 230 kV Substation $2,259,587 $2,259,587 Coly-Loblolly 69kV line $3,997,183 $3,997,183 Coly Substation $2,375,537 $2,375,537 Hammond Substation $2,530,036 $2,530,036 Loblolly Substation $269,110 $269,110

TOTAL COST $73,742,842 $18,113,452

6. SCHEDULE

A detailed schedule will be prepared subsequent to customer approval. The line upgrades are dependent on obtaining outages for the line work. If outages cannot be obtained or must be sequenced due to seasonal requirements, additional time will be required to complete the upgrades. The following are rough durations:

Task Name Proposed ISD* Build a 230 kV transmission line between Loblolly and Hammond 230 kV substations

October 2012

Danville – Winnfield re-energize 115 kV and convert 230 kV line

June 2010

Install 12 Ohm reactor at McAdams June 2010 Upgrade Montgomery-Clarence 230 kV line June 2010

* Assumes funding available and approval to proceed by 11/1/08

Notes to Duration Schedules: • Projects will begin subsequent to Definition phase and development of Rev 0 Project Execution

Plan • Schedule durations are high level estimates at this time. Upon project approval, a detailed

schedule will be produced. • Based on duration schedule requested power delivery of the magnitude specified

commencing 5/1/2010 would not be possible. Completion of work is estimated to be by 10/1/2012.

26


6.1. Project Definition Includes surveys, soil borings, and Project Execution Plan 24 Weeks

6.2. Design, procurement and construction:

Includes design, permits, material procurement, and construction 52 Weeks

Notes to Duration Schedules:

• All construction work requiring outages will be performed during off-peak load season. Line outages will be discussed with the SOC and TOC and the assumption is made that line outages will be executed as planned. However, last minute denial of outages by the SOC/TOC along with resulting schedule delay is possible.

• Transmission Line project will begin subsequent to completion of Definition phase Project Execution Plans.

• Schedule durations are high level estimates at this time. Upon project approval, a detailed schedule will be produced.

• This schedule does not account for adverse weather conditions.

7. RISK ASSESSMENT Identify risk events that may impact cost and/or schedule during execution of the project.

Risk Comment Impact

Material costs steel & Equipment

Rising steel, copper, fuel and other market conditions could greatly affect estimated cost. ****

Weather & Equipment Lead Times (Transformer, Poles)

Unexpected delays on material lead times, unusually inclement weather will impact schedule but might impact AFUDC costs as well. **

Outages may not be available

Preliminary schedule only considers general outage constraints. Specific project schedule may be delayed by days, weeks or months dependant on system conditions. Delays of months = increased project costs. **

Scope based on design assumptions which may change Varied impact on cost and schedule. ***

*-low impact to cost, ** - moderate impact to cost, ***- high impact to cost, **** - very high impact to cost.

27


8. CONFIRMED RESERVATIONS OASIS PSE MW Begin End 250778 (delisting) Entergy Services, Inc. (EMO) 1 7/2/1998 7/1/2011 392740 Ameren Energy, Inc. 165 4/12/1999 1/1/2009 569011 Entergy Services, Inc. (EMO) 242 3/1/2000 1/1/2014

731017 South Miss Electric Power Assoc 75 1/1/2001 6/1/2009

759196 Entergy Services, Inc. (EMO) 143 1/1/2001 1/1/2021 759294 East Texas Electric Cooperative 31 1/1/2001 1/1/2018 850304 Municipal Energy Agency of Miss 13 5/1/2001 6/1/2010 851493 Municipal Energy Agency of Miss 13 5/1/2001 6/1/2010

1024194 (renewal) City Water & Light, Jonesboro 83 1/1/2003 1/1/2010 1024198 (renewal) City Water & Light, Jonesboro 168 1/1/2003 1/1/2010 1084342 East Texas Electric Cooperative 50 1/1/2005 1/1/2009 1084344 East Texas Electric Cooperative 50 1/1/2005 1/1/2009 1084345 East Texas Electric Cooperative 75 1/1/2005 1/1/2009 1096986 Tennessee Valley Authority 73 9/1/2003 9/1/2013 1099991 (renewal) City Water & Light, Jonesboro 83 1/1/2010 1/1/2016 1099997 (renewal) City Water & Light, Jonesboro 168 1/1/2010 1/1/2016 1105665 Entergy Services, Inc. (EMO) 236 2/1/2003 2/1/2016 1105666 Entergy Services, Inc. (EMO) 91 2/1/2003 2/1/2027 1105668 Entergy Services, Inc. (EMO) 77 2/1/2003 2/1/2027 1126821 Entergy Services, Inc. (EMO) 101 5/1/2004 5/1/2029 1151106 Entergy Services, Inc. (EMO) 20 6/1/2010 6/1/2029 1161925 CLECO Power LLC (Gen) 12 8/1/2003 1/1/2010 1161927 CLECO Power LLC (Gen) 7 8/1/2003 1/1/2010 1161928 CLECO Power LLC (Gen) 7 8/1/2003 1/1/2010 1168061 Entergy Services, Inc. (EMO) 80 8/1/2004 2/1/2028 1168408 Entergy Services, Inc. (EMO) 247 8/1/2004 2/1/2028 1202470 NRG Power Marketing 91 4/1/2004 4/1/2009 1286481 Merrill Lynch Commodities 11 1/1/2000 1/1/2010 1289686 (delisting) Entergy Services, Inc. (EMO) 1 6/1/2007 6/1/2030 1294132 Entergy Services, Inc. (EMO) 526 1/1/2006 1/1/2035 1309874 (renewal) East Texas Electric Cooperative 75 1/1/2009 1/1/2017 1309875 (renewal) East Texas Electric Cooperative 50 1/1/2009 1/1/2017

28


OASIS PSE MW Begin End 1309876 (renewal) East Texas Electric Cooperative 50 1/1/2009 1/1/2017

1310448 (1284799) (delisting) Entergy Services, Inc. (EMO) 1 6/1/2007 6/1/2030

1328125 CLECO Power Marketing 35 1/1/2006 1/1/2011 1340017 Plump Point Energy Associates 40 3/1/2010 3/1/2040 1340019 Plump Point Energy Associates 35 3/1/2010 3/1/2040 1340665 Entergy Services, Inc. (EMO) 200 1/1/2006 1/1/2009 1346437 Entergy Services, Inc. (EMO) 100 6/1/2008 6/1/2009 1348508 CLECO Power Marketing 10 1/1/2006 1/1/2010 1352704 (1340032) Plump Point Energy Associates 5 3/1/2010 3/1/2040 1356328 Municipal Energy Agency of Miss 40 6/1/2010 6/1/2040 1373643 City of Conway 25 3/1/2010 3/1/2040 1375299 Louisiana Generating LLC 11 3/1/2006 3/1/2013 1375300 Louisiana Generating LLC 8 3/1/2006 3/1/2011 1375301 Louisiana Generating LLC 5 3/1/2006 3/1/2011 1375559 CLECO Power LLC (Gen) 675 12/1/2006 12/1/2016 1380484 Osceola Light & Power 9 9/1/2009 9/1/2039 1381398 Constellation Energy Group 34 1/1/2006 1/1/2036 1381400 Constellation Energy Group 34 1/1/2006 1/1/2036 1381404 Constellation Energy Group 17 1/1/2006 1/1/2036 1381406 (1325187) Constellation Energy Group 17 1/1/2006 1/1/2036

1383852 Arkansas Electric Cooperative Corp. 550 1/1/2007 1/1/2017

1385158 NRG Power Marketing 13 10/1/2007 10/1/2027

1385835 (1363730) City of Prescott 22 4/1/2006 4/1/2009 1387272 CLECO Power LLC (Gen) 11 4/1/2006 4/1/2016 1389008 NRG Power Marketing 270 6/1/2007 6/1/2008 1393874 NRG Power Marketing 5 9/1/2006 9/1/2009 1401985 Constellation Energy Group 42 8/1/2006 8/1/2036


1407894 (renewal) Morgan Stanley Commodities Group 102 1/1/2008 1/1/2009

1407895 (renewal) Morgan Stanley Commodities Group 102 1/1/2008 1/1/2009

29


OASIS PSE MW Begin End


1408981 NRG Power Marketing 92 1/1/2007 1/1/2010 1410022 (1340037) Constellation Energy Group 60 3/1/2010 3/1/2040 1422708 (delisting) Entergy Services, Inc. (EMO) 1 1/1/2007 1/1/2027 1425495 East Texas Electric Cooperative 50 3/1/2010 3/1/2045 1431165 Cargill Power Markets, LLC 103 1/1/2008 1/1/2009 1435972 Entergy Services, Inc. (EMO) 150 5/1/2007 5/1/2010 1435973 Entergy Services, Inc. (EMO) 135 5/1/2008 5/1/2010

1437089 Arkansas Electric Cooperative Corp.

72 / 349 1/1/2007 1/1/2012


77 / 84 1/1/2008 1/1/2012

1440190 Arkansas Electric Cooperative Corp. 104 1/1/2008 1/1/2012

1442295 (renewal) NRG Power Marketing 3 7/1/2007 7/1/2009 1442296 (renewal) NRG Power Marketing 103 1/1/2008 1/1/2011 1442453 NRG Power Marketing 320 6/1/2007 6/1/2026 1448044 Entergy Services, Inc. (EMO) 3 1/1/2007 9/21/2009 1448054 NRG Power Marketing 103 1/1/2008 1/1/2009 1448057 NRG Power Marketing 103 1/1/2008 1/1/2009 1449494 Entergy Services, Inc. (EMO) 154 6/1/2007 6/1/2009 1449495 Entergy Services, Inc. (EMO) 322 6/1/2009 6/1/2059 1449881 Cargill Power Markets, LLC 103 1/1/2008 1/1/2009 1450222 American Electric Power 225 1/1/2008 1/1/2010 1452307 (renewal) NRG Power Marketing 100 1/1/2008 1/1/2009 1452308 NRG Power Marketing 100 1/1/2008 1/1/2009 1452603 NRG Power Marketing 100 9/1/2007 9/1/2008 1453402 NRG Power Marketing 40 1/1/2009 1/1/2010 1456636 CLECO Power Marketing 10 10/1/2007 10/1/2012 1460876 Aquila Networks - MPS 75 3/1/2009 3/1/2029 1460878 Aquila Networks - MPS 75 3/1/2009 3/1/2029 1460879 Aquila Networks - MPS 75 3/1/2009 3/1/2029 1460881 Aquila Networks – MPS 75 3/1/2009 3/1/2029 1460898 Louisiana Energy & Power 3 1/1/2009 1/1/2030

30


OASIS PSE MW Begin End Authority

1460899 Louisiana Energy & Power Authority 5 1/1/2009 1/1/2030


1464028 East Texas Electric Cooperative 168 1/1/2010 1/1/2040 1466197 NRG Power Marketing 206 1/1/2009 1/1/2010 1466561 Constellation Energy Group 28 1/1/2008 1/1/2009 1466562 Constellation Energy Group 25 1/1/2008 1/1/2009

1468113 Municipal Energy Agency of Miss 20 6/1/2011 6/1/2041

1470811 East Texas Electric Cooperative 186 1/1/2010 1/1/2040

1472304 (renewal) South Miss Electric Power Assoc 75 6/1/2009 6/1/2011


1477069 Entergy Services, Inc. (EMO) 10 11/1/2007 11/1/2037 1477256 NRG Power Marketing 103 1/1/2008 1/1/2009 1479051 NRG Power Marketing 103 7/1/2008 7/1/2009 1480164 Entergy Services, Inc. (EMO) 725 1/1/2005 9/1/2033 1483485 Entergy Services, Inc. (EMO) 100 1/1/2008 1/1/2011 1485805 NRG Power Marketing 103 7/1/2008 7/1/2009 1486898 (renewal) NRG Power Marketing 100 9/1/2008 9/1/2009 1487076 (renewal) Cargill Power Markets, LLC 103 1/1/2009 1/1/2010 1487084 (renewal) Cargill Power Markets, LLC 103 1/1/2009 1/1/2010 1487880 NRG Power Marketing 300 1/1/2008 1/1/2010 1487892 (renewal) NRG Power Marketing 100 1/1/2009 1/1/2010 1487893 (renewal) NRG Power Marketing 100 1/1/2009 1/1/2010 1492216 (renewal) NRG Power Marketing 92 1/1/2010 1/1/2025 1492223 Constellation Energy Group 22 1/1/2008 1/1/2009 1494443 Constellation Energy Group 35 1/1/2008 1/1/2009 1494445 Constellation Energy Group 75 1/1/2008 1/1/2009 1494446 Constellation Energy Group 75 1/1/2008 1/1/2009 1494450 Constellation Energy Group 25 1/1/2008 1/1/2009 1495910 Southwestern Electric 78 5/1/2010 5/1/2013

31


OASIS PSE MW Begin End 1498120 Constellation Energy Group 60 4/1/2012 4/1/2042 1498122 Constellation Energy Group 30 4/1/2012 4/1/2042 1498129 City of Conway 50 4/1/2012 4/1/2042 1499818 (renewal) Merrill Lynch Commodities 85 11/1/2007 11/1/2008

1499819 (renewal) Merrill Lynch Commodities 4 11/1/2007 11/1/2008 1499610 NRG Power Marketing 300 1/1/2008 1/1/2013 1500582 (delisting) Entergy Services, Inc. (EMO) 1 1/1/2008 1/1/2038 1500584 (delisting) Entergy Services, Inc. (EMO) 1 1/1/2008 1/1/2038


200 / 330 1/1/2008 1/1/2013

1503806 Constellation Energy Group 50 1/1/2008 1/1/2009 1503807 Constellation Energy Group 25 1/1/2008 1/1/2009 1505603 East Texas Electric Cooperative 10 1/1/2008 1/1/2010 1512518 Westar Energy 6 10/1/2007 10/1/2008

1514102 East Texas Electric Cooperative 29 1/1/2008 1/1/2017 1514104 East Texas Electric Cooperative 35 1/1/2008 1/1/2017 1514105 (delisting) East Texas Electric Cooperative 1 1/1/2008 1/1/2017 1517005 (renewal) NRG Power Marketing 103 1/1/2011 1/1/2026 1519357 (renewal) Constellation Energy Group 100 1/1/2008 1/1/2009 1521210 (renewal) NRG Power Marketing 5 9/1/2009 9/1/2010 1521266 (renewal) MidAmerican Energy, Inc. 50 1/1/2008 1/1/2009 1521268 (renewal) MidAmerican Energy, Inc. 50 1/1/2008 1/1/2009 1521269 (renewal) MidAmerican Energy, Inc. 50 1/1/2008 1/1/2009 1521270 (renewal) MidAmerican Energy, Inc. 50 1/1/2008 1/1/2009 1523070 (renewal) NRG Power Marketing 100 9/1/2009 9/1/2010 1523071 (renewal) NRG Power Marketing 100 1/1/2010 1/1/2011 1523072 (renewal) NRG Power Marketing 100 1/1/2010 1/1/2011 1525148 Merrill Lynch Commodities 16 11/1/2007 11/1/2008 1525820 (renewal) NRG Power Marketing 3 7/1/2009 7/1/2014 1526694 (renewal) NRG Power Marketing 103 1/1/2009 1/1/2010 1527816 Westar Energy 6 10/1/2007 10/1/2012 1528112 (renewal) Entergy Services, Inc. (EMO) 50 6/1/2008 6/1/2009 1528113 (renewal) Entergy Services, Inc. (EMO) 200 6/1/2008 6/1/2009 1528114 Entergy Services, Inc. (EMO) 1523 1/1/2008 1/1/2038 1528115 Entergy Services, Inc. (EMO) 1039 1/1/2008 1/1/2038

32


OASIS PSE MW Begin End 1528116 Entergy Services, Inc. (EMO) 1834 1/1/2008 1/1/2038 1530287 Empire District 50 3/1/2010 3/1/2030 1530288 Empire District 50 3/1/2010 3/1/2030 1531163 (renewal) NRG Power Marketing 103 7/1/2009 7/1/2010 1535503 (delisting) Entergy Services, Inc. (EMO) 1 5/1/2008 5/1/2009 1535504 Entergy Services, Inc. (EMO) 485 5/1/2008 5/1/2009 1535867 (renewal) MidAmerican Energy, Inc. 100 3/1/2008 3/1/2009


1546108 Entergy Services, Inc. (EMO) 1 1/1/2011 1/1/2051 1557218 Entergy Services, Inc. (EMO) 1 7/1/2008 7/1/2009 1557219 Entergy Services, Inc. (EMO) 260 7/1/2008 7/1/2009 1557220 Entergy Services, Inc. (EMO) 1 7/1/2009 7/1/2018 1557221 Entergy Services, Inc. (EMO) 520 7/1/2009 7/1/2018 250778 (delisting) Entergy Services, Inc. (EMO) 1 7/2/1998 7/1/2011 392740 Ameren Energy, Inc. 165 4/12/1999 1/1/2009 569011 Entergy Services, Inc. (EMO) 242 3/1/2000 1/1/2014


759196 Entergy Services, Inc. (EMO) 143 1/1/2001 1/1/2021 759294 East Texas Electric Cooperative 31 1/1/2001 1/1/2018 850304 Municipal Energy Agency of Miss 13 5/1/2001 6/1/2010 851493 Municipal Energy Agency of Miss 13 5/1/2001 6/1/2010

9. PRE-888 TRANSACTIONS OASIS # PSE MW Begin End 1332606 East Texas Electric Cooperative 55 1/1/2006 1/1/2017 1412155 Entergy Services, Inc. (EMO) 1718 1/1/2007 1/1/2038 1412156 Entergy Services, Inc. (EMO) 741 1/1/2007 1/1/2038 1412158 Entergy Services, Inc. (EMO) 1867 1/1/2007 1/1/2038 1412160 Entergy Services, Inc. (EMO) 1142 1/1/2007 1/1/2038 1412161 Entergy Services, Inc. (EMO) 59 1/1/2007 1/1/2038 1412162 Entergy Services, Inc. (EMO) 148 1/1/2007 1/1/2038 1412163 Entergy Services, Inc. (EMO) 194 1/1/2007 1/1/2038 1412164 Entergy Services, Inc. (EMO) 1157 1/1/2007 1/1/2038 1412165 Entergy Services, Inc. (EMO) 1219 1/1/2007 1/1/2038 1412166 Entergy Services, Inc. (EMO) 683 1/1/2007 1/1/2038

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OASIS # PSE MW Begin End 1412167 Entergy Services, Inc. (EMO) 140 1/1/2007 1/1/2038 1412168 Entergy Services, Inc. (EMO) 456 1/1/2007 1/1/2038 1412169 Entergy Services, Inc. (EMO) 739 1/1/2007 1/1/2038 1412170 Entergy Services, Inc. (EMO) 183 1/1/2007 1/1/2038 1412171 Entergy Services, Inc. (EMO) 64 1/1/2007 1/1/2038 1412172 Entergy Services, Inc. (EMO) 870 1/1/2007 1/1/2038 1412173 Entergy Services, Inc. (EMO) 129 1/1/2007 1/1/2038 1412174 Entergy Services, Inc. (EMO) 140 1/1/2007 1/1/2038 1412175 Entergy Services, Inc. (EMO) 130 1/1/2007 1/1/2038 1412176 Entergy Services, Inc. (EMO) 65 1/1/2007 1/1/2038 1412177 Entergy Services, Inc. (EMO) 947 1/1/2007 1/1/2038 1412178 Entergy Services, Inc. (EMO) 61 1/1/2007 1/1/2038 1412179 Entergy Services, Inc. (EMO) 304 1/1/2007 1/1/2038 1412180 Entergy Services, Inc. (EMO) 351 1/1/2007 1/1/2038 1412181 Entergy Services, Inc. (EMO) 692 1/1/2007 1/1/2038 1412182 Entergy Services, Inc. (EMO) 1641 1/1/2007 1/1/2038 1412183 Entergy Services, Inc. (EMO) 433 1/1/2007 1/1/2038 1412184 Entergy Services, Inc. (EMO) 1926 1/1/2007 1/1/2038 1412185 Entergy Services, Inc. (EMO) 946 1/1/2007 1/1/2038 1412186 Entergy Services, Inc. (EMO) 1233 1/1/2007 1/1/2038 1498278 Entergy Services, Inc. (EMO) 75 8/1/2007 1/1/2017 1498281 Entergy Services, Inc. (EMO) 86 8/1/2007 1/1/2017 1498283 Entergy Services, Inc. (EMO) 68 8/1/2007 1/1/2017 1498284 Entergy Services, Inc. (EMO) 78 8/1/2007 1/1/2017 1498285 Entergy Services, Inc. (EMO) 11 8/1/2007 1/1/2044 1498286 Entergy Services, Inc. (EMO) 69 8/1/2007 1/1/2044 1498287 Entergy Services, Inc. (EMO) 14 8/1/2007 1/1/2044 See the following hyperlink for a complete listing of all Pre-888 transactions. http://oasis.e-terrasolutions.com/documents/EES/Pre-Order888Transactions.xls

10. STUDY QUEUE

OASIS # PSE MW Begin End


1478781 Entergy Services, Inc. (EMO) 804 1/1/2008 1/1/2058 1481059 Constellation Energy Group 60 2/1/2011 2/1/2030 1481111 City of Conway 50 2/1/2011 2/1/2046 1481119 Constellation Energy Group 30 2/1/2011 2/1/2030

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http://oasis.e-terrasolutions.com/documents/EES/Pre-Order888Transactions.xls


OASIS # PSE MW Begin End


1481438 NRG Power Marketing 20 2/1/2011 2/1/2021 1483241 NRG Power Marketing 103 1/1/2010 1/1/2020 1483243 NRG Power Marketing 206 1/1/2010 1/1/2020 1483244 NRG Power Marketing 309 1/1/2010 1/1/2020 1520043 Municipal Energy Agency of Miss 20 1/1/2011 1/1/2026

1547988 West Star Energy Generation & Marketing 27 6/1/2010 6/1/2040

1551562 CLECO Power LLC 11 6/1/2009 6/1/2018 1552146 Entergy Services, Inc. (EMO) 1 1/1/2009 1/1/2014 1552148 Entergy Services, Inc. (EMO) 1 1/1/2009 1/1/2014 1555717 East Texas Electric Coop 1 1/1/2010 1/1/2015 1555718 Entergy Services, Inc. (EMO) 158 1/1/2010 1/1/2015 1557067 NRG Power Marketing 5 10/1/2009 10/1/20141557602 East Texas Electric Coop 1 1/1/2009 1/1/2017 1558905 NRG Power Marketing 250 7/1/2009 7/1/2014 1558911 NRG Power Marketing 100 1/1/2009 1/1/2014


1478781 Entergy Services, Inc. (EMO) 804 1/1/2008 1/1/2058 1481059 Constellation Energy Group 60 2/1/2011 2/1/2030 1481111 City of Conway 50 2/1/2011 2/1/2046 1481119 Constellation Energy Group 30 2/1/2011 2/1/2030


1481438 NRG Power Marketing 20 2/1/2011 2/1/2021 1483241 NRG Power Marketing 103 1/1/2010 1/1/2020 1483243 NRG Power Marketing 206 1/1/2010 1/1/2020

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11. ATTACHMENTS A. Table of Acronyms

ACSR Aluminum Conductor Steel Reinforced ACSS Aluminum Conductor Steel Supported ADEQ Arkansas Department of Environmental Quality AFUDC Allowance for Funds Used During Construction ATC Available Transfer Capability EES Entergy Control Area EHV Extra-High Voltage ICT Independent Coordinator of Transmission kV Kilo-Volt MCM (M) Thousand Circular Mils MVA Mega-Volt Amp MW Mega-Watt NPDES National Pollution Discharge Elimination System NOI Notice of Intent OASIS Online Access and Same-time Information System OATT Open Access Transmission Tariff OG&E Oklahoma Gas & Electric POD Point of Delivery POR Point of Receipt SES Steam Electric Station SOC System Operations Center SHPO Arkansas State Historic Preservation Office SHV Super High Voltage SW Switch Station SWEPCO Southwest Electric Power Company TOC Transmission Operations Center WMUC City of West Memphis Control Area

B. One Line Drawings

Location Description Drawing Number

Winnfield 230kV Substation L0039S05

Danville 230kV Substation L0436S05

Coly 500/230/69kV Substation G7171S05

Coly 500/230/69kV Substation G7171S06

Loblolly 69/13.8kV Substation G7230S05

Fairgrounds 69/13.8kV Substation G7185S05

Hammond 230kV Substation L0517S05

McAdams 500kV Substation M3920S05

McAdams 500kV Substation M3920EA1

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NRG OASIS 1559579, 1559580, & 1559581 Facilities Study NRG OASIS 1559579, 1559580, & 1559581 Facilities Study

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