ICT 2009 Reliability Assessment and Construction Plan Evaluation

Entergy Transmission SummitAugust 11, 2009Astor Crown PlazaNew Orleans, Louisiana

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Overview

• Background

• Scope

• Draft Construction Plan

• Results

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Background

• Reliability Assessment is performed pursuant to Entergy’s Open Access Transmission Tariff (OATT) Attachment K.

• Objectives: • Assess of the ability of the Entergy transmission

system to perform according to the Planning Criteria.

• Evaluate the Construction Plan’s ability to mitigate any performance deficiencies found.

• Provide basis for development of the Base Plan.

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Background

• Draft report was made available for stakeholder review and comment• Posted on Entergy’s OASIS July 17, 2009

• Presentation made at LTTIWG July 22, 2009

• Final report is posted on Entergy’s OASIS.• Detailed information not included in report is posted

• Background models, data, and other information is posted

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Entergy Planning Criteria

• Planning Criteria• NERC Planning Standards

• SERC Supplements

• Entergy’s Local Planning Criteria

• Entergy’s Business Practices (Planning Guidelines)

• Posted on Entergy’s OASIS

• NERC Planning Standards being revised

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Reliability Assessment Scope

• Models• Near-Term Period: Summer & Winter 2010 & 2014• Longer-Term Period: Summer 2018• Construction Plan Projects

1. Initial Scan: Approved Projects from 2009-11 Construction Plan

2. CP Eval: Approved and Proposed Projects <2010-12 Construction Plan

• System Intact Review – Category A• Contingency Scan – Category B• Sensitivities

• Specific Load Pocket Criteria• Low Hydro Sensitivity

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Entergy’s Draft Construction Plan 2010-2012

• May 13, 2009: Original Draft Posted

• July 16, 2009: Revision 1 Posted

• August 3, 2009: Revision 2 Posted• 25 New Projects

• 10 Accelerated Projects

• 4 Delayed Projects

• 20 Projects reported in the 2008 Differences Report• 12 were directly included in the draft CP project

• 7 were replaced in the draft CP by an alternative project

• 1 was partly included; the full project is expected in a later CP

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Near-Term: 2010 Problems and SolutionsProjected Problem Area Draft CP Project and Est. In-Service Date

Fish Creek-Longmire 138 kV (Western) College Station 138 kV Switch Station (2010)

Chlomal-Jennings 69 kV corridor (SW La.) Carter & Elton (2010)

Acadiana Area (S La.) Acadiana Area Improvement Project Phase 1 (2011) and Phase 2 (2012)

Holiday-Lafayette 69 kV (S La.) Youngsville 138 kV Substation (2011)

Willow Glen-Monochem & Sorrento-Vignes (SE La.)

Willow Glen-Conway 230 kV (2014)

Liberty-Amite & Brookhaven-Norfield (S Miss.) Bogue Chitto 500/230 kV (2013)

South Jackson-Brookhaven 115 kV corridor (S Miss.)

Ray Braswell-Wyndham-Byram (2013)

Tillatoba-Winona 115 kV corridor (Central Miss.)

Grenada Area Improvement Phase 2 Project (2012)

Hot Springs-Amity Tap 115 kV (Central Ark.) Aquila TSA (2011)

Lynch-McAlmont 115 kV (Central Ark.) Holland Bottoms (2012)

Harrison-Everton 161 kV (N Ark) Harrison East Switches (2011)

Harrison-Eureka 161 kV corridor (N Ark.) Grandview (2011)

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Near-Term: 2014 Problems and Solutions

Projected Problem Area Draft CP Project and Est. In-Service Date

115 kV system south of Valentine-Barataria-Port Nickels (SE La.) SE LA Coastal Improvement Phase 3 (2012)

Waterford-Tezcuco 230 kV Belle Point-Gypsy 230 kV (SE La.) Bayou Steel-Tezcuco (2012)

Kenner-Snakefarm 115 kV (SE La.) Kenner-Snakefarm (2010 Winter)

Waterways-Vicksburg East 115 kV (SW Miss.) Waterways-Vicksburg East (2011)

Baxter Wilson-Ray Braswell 500 kV (SW Miss.) Baxter Willson-Ray Braswell 500 kV (2010)

Benton-Bauxite-Mabelvale 115 kV Corridor (Central Ark.) Benton S-Benton N (2012)

Cabot Area 115 kV Voltage (Central Ark.) Ward Capacitor (2010)

Morrilton East-Gleason-Tyler 161 kV (Central Ark.) Holland Bottoms-Hamlet (2012)

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Near-Term: 2014 Problem Areas Under Study

Projected Problem Area CommentCalvert 69 kV (Low Voltage) (Western)

New Caney 138 kV (Low Voltage) (Western)

Port Neches Bulk-Sabine 138 kVPort Neches Bulk-Linde 138 kV (SE Tex.) Possible mitigation: Op Guide

Kolbs-Lakeview 69 kV (SE Tex.)

Mossville-Line 253A Tap 69 kV (SW La.)

Cecelia-Semere 138 kV (S La.)

Fivepoints-Tigre 69 kV (S La.) Possible mitigation: Existing spare transformer

Carlisle (La.) 115 kV (Low Voltage) (SE La.) Possible mitigation: Automatic load transfer

Horn Lake-Hernando 115 kV Corridor (N Miss.)Getwell-Batesville 230 kV Project first leg in

the draft CP. Transformer tap adjustments are also being investigated.

Parkin-Twist 161 kV (NE Ark.) Alternatives under consideration.

Bull Shoals SPA-Bull Shoals Entergy 161 kV (N Ark.) SPA has a planned upgrade for 2011.

Norfork-Calico Rock-Melbourne 161 kV (N Ark.) Alternatives under consideration.

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Map Legend

Year Color Key

Overloads and Low VoltagesPlanned Upgrade from

Entergy’s Draft Construction Plan

Other Notes

Solution being investigated

Annotations

Contingency Scan Results with Entergy’s Draft Construction Plan Projects Included

Key to Map Highlights

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Grandview-Osage Creek 161 kV

Line

Harrison East Upgrade

Melbourne-Sage Line Upgrade

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Holland Bottoms New Station

Holland Bottoms-Hamlet New 161 kV Line

Lynch-McAlmont 161 kV Overload

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Hot Springs-Bismarck-Alpine-Amity Upgrade

Benton North-Benton South 115 kV Line

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Greenbrook 115

Plum Point 115

Nesbit 115

Getwell 230/115

Hernando 115

Batesville 230/115

Horn Lake 230/161/115Freeport 500/230

Church Rd 230

Twinkletown 230 165 MW

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Grenada/Winona/

Greenwood

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R. Braswell-Byram 115 kV Line

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Bogue Chitto

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Kenner-Snakefarm

SE Louisiana Coastal Improvement

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Willow Glen-Conway 230 kV

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Acadiana Improvement

Project

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Mossville-L253A Tap

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Sabine-Port NechesPort Neches-Linde

Kolbs-Lakeview

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College Station 138 kV Switch Sta

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Low Hydro

• Simulate reduced availability of hydro units during summer peak• Conway (Arkansas) Area

• Harrison-Eureka 161 kV

• Norfork-Sage 161 kV

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Load Pocket Criteria

• Application of Specific Load Pocket Criteria• Western

• Amite South

• Downstream of Gypsy (DSG)

• G-1, N-1• No new problems identified.

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Longer-Term Period: 2018

Projected Problem Area Comment

Tubular-Dobbin 138 kV Area (Western)

Dayton 138 kV Area (Western)

Kolbs/Hanks Area (SE Tex.)

Tigre-L247 Tap 69 kV (S La.) Possible mitigation: Existing spare transformer

Lake Arthur, Klondike 69 kV (S La.)

Sorrento-Gonzales (SE La.)

Gypsy-Claytonia 115 kV Area (SE La.)

Minden-Minden LaGen 115 kV (N La.)

S Jackson-E Jackson 115 kV (Central Miss.)

Andrus 230/115 kV transformer (Central Miss.)

Horn Lake Area (N Miss.) Possible mitigation: Getwell-Batesville 230 kV

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Longer-Term Period: 2018Projected Problem Area Comment

Marked Tree-Twist 161 kV (NE Ark.)

Trumann-Trumann West 161 kV (NE Ark.)

NLR Dixie-Lakewood 115 kV (Central Ark.)

Bull Shoals-Norfork 161 kV (N Ark.)

Helena Area (E Ark.) Possible mitigation: Operating Guide

Cabot Area (Central Ark.)

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Gypsy-Claytonia

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Tigre-L247 Tap

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Base Plan Development Next Steps

• Today-August 31: Stakeholder Input/Comments on Projects for Base Plan and Construction Plan

• Stakeholder comments will be posted on Public OASIS (per Attach. K)

• September LTTIWG: Present/Discuss Comments

• October/November LTTIWG: ICT presents draft Base Plan for comment

• Year End: Final ICT Base Plan Posted; Final Entergy Construction Plan Posted

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Questions?

Steve PurdyLead Engineer, ICT Planning501-614-3371spurdy@spp.org