SPP.org 1

ICT Construction Plan Evaluation and Reliability Assessment Part 1 Entergy Transmission Summit July 29, 2008 Astor Crown Plaza New Orleans, Louisiana

SPP.org 3 Presentation Overview Background, Assumptions, Procedures Base Plan Study Areas Contingency Scan of Long-Term Models 1.Near-Term (2009/2013 Models) 2.Long-Term (2017 Model) Low Hydro Sensitivity Areas Showing Up In Real-Time Next Steps

SPP.org 4 Assumptions for Construction Plan Contingency Scan Models Base Case 2007-Series (Update 2) Near-term: Summer Peak 2009 and Longer-term: Summer Peak Model Changes The latest confirmed transmission service reservations were modeled. Newly in-service equipment was modeled. All 2009 Draft Construction Plan Projects were added in the year following the in-service year, including Supplemental upgrades Base Plan upgrades were not included if they were not also in the Draft Construction Plan.

SPP.org 5 Assumptions for Construction Plan Contingency Scan Monitored Elements and N-1 Contingencies All facilities within Entergy footprint including embedded areas and ties to external areas, plus CLECO and LUS at 69 kV and higher. First-tier areas at 345 kV and higher. NERC Category A: Thermal Limits: <100% of Rate A Voltage Limits: +/- 5% of Nominal NERC Category B: Thermal Limits: <100% of Rate A Voltage Limits: +5% / -8% of Nominal For elements outside the limits, the analysis was repeated for the breaker-to-breaker contingency. Elements that were still outside the limits were flagged. Elements that were within the limits, but for which the Consequential Load >100 MW were flagged. (“100 MW Rule”)

SPP.org 6 Results for Category A Thermal Overloads Nominal kV Level TOTAL007 Undervoltages Nominal kV Level TOTAL1048

SPP.org 7 Project is not included in either model Code for Base Plan and Construction Plan Projects Indicated on Maps BP = Project Number from 2008 Base Plan CP(2011) = 2008 Construction Plan and Expected In-Service Year DCP(2011) = 2009 Draft Construction Plan and In-Service Year Map Legend BP CP(2011) DCP(2011) Background Color Indicates Projects’ Inclusion In Case Project is in 2013 model only Project is in both 2009 & 2013 models

SPP.org 8 Arkansas

SPP.org 9 BP CP(2011) DCP(2011)

SPP.org 10

SPP.org 11 BP CP(?) DCP(?) BP NA

SPP.org 12 BP NA BP NA BP CP(2011) DCP(2011) NA DCP(2010)

SPP.org 13 BP NA BP NA (Supplemental) CP(2008) NA BP NA DCP(2013) BP08-047A-D CP(2008) DCP(2008)

SPP.org 14 BP NA BP NA BP NA BP NA BP NA

SPP.org 15 BP NA (Supplemental) CP(2010) DCP(2010)

SPP.org 16 BP CP(2008) DCP(2008) BP CP(2009) DCP(2009)

SPP.org 17 BP CP(2008) DCP(2008)

SPP.org 18 BP CP(2011) DCP(2011)

SPP.org 19 Mississippi

SPP.org 20 BP NA BP CP(2009) DCP(2009)

SPP.org 21 BP CP(2012) DCP(2012) NA DCP(2009)

SPP.org 22 BP CP(2012) DCP(2012) NA DCP(2011) BP CP(2011) DCP(2011)

SPP.org 23 BP NA BP CP(2011) DCP(2011)

SPP.org 24 Louisiana

SPP.org 25 BP CP(2011) DCP(2011) BP CP(2010) DCP(2010)

SPP.org 26 BP NA

SPP.org 27

SPP.org 28

SPP.org 29 BP CP(2008) DCP(2008) BP CP(2010) DCP(2010) BP CP(2010) DCP(2010)

SPP.org 30 BP CP(2008) DCP(2008) BP CP(2008) DCP(2008)

SPP.org 31 BP CP(2009) DCP(2009)

SPP.org 32 BP NA BP NA BP CP(2009) DCP(2009) NA DCP(2012) (Supplemental) CP(2009) DCP(2009)

SPP.org 33 NA DCP (2010) BP NA BP CP(2010) DCP(2010) BP CP(2008) DCP(2008) BP NA

SPP.org 34 BP NA DCP (2011) BP NA

SPP.org 35 Texas

SPP.org 36 CP(2012) BP CP(2008) DCP(2008) BP CP(2008) DCP(2008) NA DCP(2012)

SPP.org 37 NA DCP(2010)

SPP.org 38 BP CP(2009) DCP(2009)

SPP.org 39 BP08-043A/B CP(2011/12) DCP(2011/12) BP CP(2010) DCP(2009/11)

SPP.org 40 BP CP(2009) DCP(2009)