ICT Construction Plan Evaluation and Reliability Assessment Part 1

2. ICT Construction Plan Evaluation and Reliability Assessment Part 1 Entergy Transmission SummitJuly 29, 2008Astor Crown PlazaNew Orleans, Louisiana

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

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. 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. Results for Category A

7. Map Legend 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 BP08-036 CP(2011) DCP(2011) Project is in both 2009 & 2013 models Project is in 2013 model only Project is not included in either model Background Color Indicates Projects’ Inclusion In Case

8. Arkansas

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

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

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

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

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

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

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

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

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

19. Mississippi

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

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

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

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

24. Louisiana

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

26. BP08-030 NA NA

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

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

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

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

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

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

35. Texas

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

37. NA NA DCP(2010)

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

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

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