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Entergy ICT Transmission Planning Summit ISTEP 2010 Update

Entergy ICT Transmission Planning Summit ISTEP 2010 Update. Harvey Scribner August 11, 2010 New Orleans, Louisiana. ICT Strategic Expansion Plan (ISTEP) - Purpose. Promote EHV expansion on Entergy transmission system by identifying problem areas and developing long-term strategic solutions

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Entergy ICT Transmission Planning Summit ISTEP 2010 Update

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  1. Entergy ICT Transmission Planning Summit ISTEP 2010 Update Harvey Scribner August 11, 2010 New Orleans, Louisiana

  2. ICT Strategic Expansion Plan (ISTEP) - Purpose • Promote EHV expansion on Entergy transmission system by identifying problem areas and developing long-term strategic solutions • Improving Load-Serving Capability • Improving Transfer Capability • Improving Deliverability to Load Pockets/Load Centers • Relieving Constraining Flowgates • Outside the scope of the ICT Base Plan • FERC Order 890 – Five free economic studies

  3. Schedule • *LTTIWG – 3/16/2010 • Present general schedule • Post TLR events • Post AFC limiting FG’s – 3/24/2010 • Request more detail on Stakeholder proposed projects – 3/24/2010 • Stakeholder preliminary responses – 3/31/2010 • Post and distribute project list for stakeholder email vote – 4/1/2010 • LTTIWG – 4/13/2010 • Stakeholder proposed projects • Powerflow base case model update – 4/16/2010 • Email Votes due – 4/21/2010 * Red – Task completed

  4. Schedule (cont.) • Post voting results as part of background material – 5/4/2010 • LTTIWG –Baton Rouge, LA – 5/11/2010 • Present top 10 project selection • SPC –Baton Rouge, LA – 5/12/2010 • Vote on top 5 projects • LTTIWG –Houston, TX – 7/21/2010 • Update • Entergy ICT Transmission Planning Summit – August 11, 2010 • GridView Base Model update – August 2010 • Powerflow change model analysis and project selection – September 2010 • Plan cost estimates – September 2010 • GridView Economic analysis – October 2010 • Final results – Late 4thQuarter 2010 • Final report – Early 1stQuarter 2011

  5. 2010 ISTEP – Selected Projects • Conway Area • Morrilton-Gleason 161kV • Gleason-Tyler 161kV • Tyler-Conway W 161kV • Mayflower-Morgan 115kV • North East Arkansas • Newport-Fisher FTLO ISES – Dell 500kV, FG #1946 • Paragould –Monette Junction FTLO ISES –Dell 500kV, FG #1948 • Melbourne –Sage FLTO ISES –Dell 500kV, FG #14769 • Newport –Newport Industrial FTLO ISES –Dell 500kV, FG #15540 • Swifton –Hoxie FTLO ISES –Dell 500kV, FG #15217 • Parkin –Gilmore FTLO ISES –Dell 500kV, FG #16071

  6. 2010 ISTEP – Selected Projects (cont.) • Mt. Olive –Hartburg voltage stability constraint – Thermal capacity of this line is significantly higher than its current limit which is determined by voltage stability issues in WOTAB. Adding series compensation to this line or splitting the line may mitigate the problem • Hartburg-Cypress 500kV contingency – Underlying network in WOTAB becomes the limit for injections into Hartburg 500kV substation. A new Hartburg-Sabine 230kV line may address this issue • ANO-Pleasant Hills FTLO ANO-Mabelvale flowgates

  7. 2010 ISTEP Project – Conway Area • Entergy Draft Construction Plan 2011-2013 • Holland Bottoms (Cabot EHV): Construct new 500/161/115 kV substation • Phase 1 Projects (Summer 2011, Approved) • Tap the Keo - ISES 500 kV Line • Tap the Cabot - Jacksonville North 115 kV Line • Install 500 kV and 115 kV Busses and a 600 MVA 500 kV / 115 kV Autotransformer • Phase 2 Projects (2012, Proposed and In-Target) • Install 161 kV Bus and a 600 MVA 500 kV / 161 kV Autotransformer

  8. 2010 ISTEP Project – Conway Area (continued) • Holland Bottoms - Hamlet 161 kV Line: Construct new 161 kV Line (2012, Proposed and In-Target) • Convert Hamlet SS to a breaker station (Single Bus Single Breaker Scheme) • Move the Quitman line from Gold Creek to Hamlet SS • Move the Gravel Ridge line from Gold Creek to Hamlet SS • Construct a line rated at least 1200 A from Hamlet SS to Holland Bottoms

  9. 2011 Reliability Assessment Thermal Results • Morrilton East – Gleason 161 kV

  10. 2011 Reliability Assessment Thermal Results • Gleason – Tyler 161 kV

  11. 2011 Reliability Assessment Thermal Results • Lake Conway - Mayflower 115 kV

  12. 2011 Reliability Assessment Thermal Results • Mayflower - Morgan 115 kV SI = System Intact

  13. 2010 ISTEP Status • Research alternative project to replace Conway Area –select by end of August • On schedule • Complete powerflow analysis of Hartburg-Cypress 500kV contingency by end of August • TLR data analysis complete • Preparing Powerflow conditions for base case and contingency screening • On schedule • Complete construction of GridView base model update by end of August • Network update complete • Updating Interface Assignments, Contingency Definitions, Load Profiles • On Schedule

  14. Harvey ScribnerLead Engineer501-614-3229hscribner@spp.org

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