ICT 2009 Reliability Assessment and Construction Plan Evaluation Entergy Transmission Summit August 11, 2009 Astor Crown Plaza New Orleans, Louisiana

SPP.org 2 Overview Background Scope Draft Construction Plan Results

SPP.org 3 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.

SPP.org 4 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

SPP.org 5 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

SPP.org 6 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 Construction Plan 2.CP Eval: Approved and Proposed Projects < Construction Plan System Intact Review – Category A Contingency Scan – Category B Sensitivities Specific Load Pocket Criteria Low Hydro Sensitivity

SPP.org 7 Entergy’s Draft Construction Plan 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

SPP.org 8 Near-Term: 2010 Problems and Solutions Projected Problem AreaDraft 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)

SPP.org 9 Near-Term: 2014 Problems and Solutions Projected Problem AreaDraft 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)

SPP.org 10 Near-Term: 2014 Problem Areas Under Study Projected Problem AreaComment Calvert 69 kV (Low Voltage) (Western) New Caney 138 kV (Low Voltage) (Western) Port Neches Bulk-Sabine 138 kV Port 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 Norfork-Calico Rock-Melbourne 161 kV (N Ark.)Alternatives under consideration.

SPP.org 11 Map Legend Year Color Key Overloads and Low Voltages Planned 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

SPP.org 12 Grandview-Osage Creek 161 kV Line Harrison East Upgrade Melbourne-Sage Line Upgrade

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SPP.org 14 Holland Bottoms New Station Holland Bottoms-Hamlet New 161 kV Line Lynch-McAlmont 161 kV Overload

SPP.org 15 Hot Springs- Bismarck-Alpine- Amity Upgrade Benton North- Benton South 115 kV Line

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SPP.org 17 Greenbrook 115 Plum Point 115 Nesbit 115 Getwell 230/115 Hernando 115 Batesville 230/115 Horn Lake 230/161/115 Freeport 500/230 Church Rd 230 Twinkletown MW

SPP.org 18 Grenada/Winona/ Greenwood

SPP.org 19 R. Braswell-Byram 115 kV Line

SPP.org 20 Bogue Chitto

SPP.org 21 Kenner-Snakefarm SE Louisiana Coastal Improvement

SPP.org 22 Willow Glen-Conway 230 kV

SPP.org 23 Acadiana Improvement Project

SPP.org 24 Mossville-L253A Tap

SPP.org 25 Sabine-Port Neches Port Neches-Linde Kolbs-Lakeview

SPP.org 26 College Station 138 kV Switch Sta

SPP.org 27 Low Hydro Simulate reduced availability of hydro units during summer peak Conway (Arkansas) Area Harrison-Eureka 161 kV Norfork-Sage 161 kV

SPP.org 28 Load Pocket Criteria Application of Specific Load Pocket Criteria Western Amite South Downstream of Gypsy (DSG) G-1, N-1 No new problems identified.

SPP.org 29 Longer-Term Period: 2018 Projected Problem AreaComment 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

SPP.org 30 Longer-Term Period: 2018 Projected Problem AreaComment 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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SPP.org 37 Gypsy-Claytonia

SPP.org 38 Tigre-L247 Tap

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SPP.org 41 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

SPP.org 42 Questions? Steve Purdy Lead Engineer, ICT Planning