1. SPP.org 1

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

3. 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

4. SPP.org 4 Assumptions for Construction Plan Contingency Scan Models Base Case 2007-Series (Update 2) Near-term: Summer Peak 2009 and 2013. Longer-term: Summer Peak 2017. 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. 2008 Base Plan upgrades were not included if they were not also in the Draft Construction Plan.

5. 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”)

6. SPP.org 6 Results for Category A Thermal Overloads Nominal kV Level200920132017 69005 115001 161001 TOTAL007 Undervoltages Nominal kV Level200920132017 69244 115002 138800 161001 230001 500000 TOTAL1048

7. SPP.org 7 Project is not included in either model Code for Base Plan and Construction Plan Projects Indicated on Maps BP08-036 = 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 BP08-036 CP(2011) DCP(2011) Background Color Indicates Projects’ Inclusion In Case Project is in 2013 model only Project is in both 2009 & 2013 models

8. SPP.org 8 Arkansas

9. SPP.org 9 BP08-036 CP(2011) DCP(2011)

10. SPP.org 10

11. SPP.org 11 BP08-003 CP(?) DCP(?) BP08-002 NA

12. SPP.org 12 BP08-012 NA BP08-011 NA BP08-047 CP(2011) DCP(2011) NA DCP(2010)

13. SPP.org 13 BP08-004 NA BP08-005 NA (Supplemental) CP(2008) NA BP08-001 NA DCP(2013) BP08-047A-D CP(2008) DCP(2008)

14. SPP.org 14 BP08-013 NA BP08-014 NA BP08-007 NA BP08-005 NA BP08-004 NA

15. SPP.org 15 BP08-027 NA (Supplemental) CP(2010) DCP(2010)

16. SPP.org 16 BP08-034 CP(2008) DCP(2008) BP08-035 CP(2009) DCP(2009)

17. SPP.org 17 BP08-010 CP(2008) DCP(2008)

18. SPP.org 18 BP08-052 CP(2011) DCP(2011)

19. SPP.org 19 Mississippi

20. SPP.org 20 BP08-020 NA BP08-058 CP(2009) DCP(2009)

21. SPP.org 21 BP08-061 CP(2012) DCP(2012) NA DCP(2009)

22. SPP.org 22 BP08-046 CP(2012) DCP(2012) NA DCP(2011) BP08-057 CP(2011) DCP(2011)

23. SPP.org 23 BP08-019 NA BP08-057 CP(2011) DCP(2011)

24. SPP.org 24 Louisiana

25. SPP.org 25 BP08-052 CP(2011) DCP(2011) BP08-063 CP(2010) DCP(2010)

26. SPP.org 26 BP08-030 NA

27. SPP.org 27

28. SPP.org 28

29. SPP.org 29 BP08-049 CP(2008) DCP(2008) BP08-050 CP(2010) DCP(2010) BP08-051 CP(2010) DCP(2010)

30. SPP.org 30 BP08-055 CP(2008) DCP(2008) BP08-062 CP(2008) DCP(2008)

31. SPP.org 31 BP08-054 CP(2009) DCP(2009)

32. SPP.org 32 BP08-028 NA BP08-029 NA BP08-032 CP(2009) DCP(2009) NA DCP(2012) (Supplemental) CP(2009) DCP(2009)

33. SPP.org 33 NA DCP (2010) BP08-031 NA BP08-048 CP(2010) DCP(2010) BP08-037 CP(2008) DCP(2008) BP08-023 NA

34. SPP.org 34 BP08-021 NA DCP (2011) BP08-023 NA

35. SPP.org 35 Texas

36. SPP.org 36 CP(2012) BP08-024 CP(2008) DCP(2008) BP08-053 CP(2008) DCP(2008) NA DCP(2012)

37. SPP.org 37 NA DCP(2010)

38. SPP.org 38 BP08-042 CP(2009) DCP(2009)

39. SPP.org 39 BP08-043A/B CP(2011/12) DCP(2011/12) BP08-041 CP(2010) DCP(2009/11)

40. SPP.org 40 BP08-026 CP(2009) DCP(2009)