Transitional Cluster Study

Attachment A

Group 2011 Cluster Study Transient Stability Plots

1

2011 Heavy Summer Pre-Cluster Base Case No Outage Transient Bus Voltage Plots

2011 Heavy Summer Pre-Cluster Base Case No Outage Transient Frequency Plots

2

2011 Heavy Summer Pre-Cluster Base Case Imperial Valley – El Centro 230 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Pre-Cluster Base Case Imperial Valley – El Centro 230 kV line outage Transient Frequency Plots

3

2011 Heavy Summer Pre-Cluster Base Case Coachella – Devers 230 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Pre-Cluster Base Case Coachella – Devers 230 kV line outage Transient Frequency Plots

4

2011 Heavy Summer Pre-Cluster Base Case Ramon – Mirage 230 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Pre-Cluster Base Case Ramon – Mirage 230 kV line outage Transient Frequency Plots

5

2011 Heavy Summer Pre-Cluster Base Case Imperial Valley – Miguel 500 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Pre-Cluster Base Case Imperial Valley– Miguel 500 kV line outage Transient Frequency Plots

6

2011 Heavy Summer Pre-Cluster Base Case N. Gila - Imperial Valley 500 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Pre-Cluster Base Case N. Gila - Imperial Valley 500 kV line outage Transient Frequency Plots

7

2011 Heavy Summer Pre-Cluster Base Case Palo Verde - Devers 500 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Pre-Cluster Base Case Palo Verde - Devers 500 kV line outage Transient Frequency Plots

8

2011 Heavy Summer Pre-Cluster Base Case ELSTM2 and REPU2 generator outages Transient Bus Voltage Plots

2011 Heavy Summer Pre-Cluster Base Case ELSTM2 and REPU2 generator outages Transient Frequency Plots

9

2011 Heavy Summer Pre-Cluster Base Case Path 42 outage w/ RAS Transient Bus Voltage Plots

2011 Heavy Summer Pre-Cluster Base Case Path 42 outage w/RAS Transient Frequency Plots

10

2011 Heavy Summer Pre-Cluster Base Case Coachella –Devers & Coachella-Ramon outage w/ RAS Transient Bus Voltage Plots

2011 Heavy Summer Pre-Cluster Base Case Coachella –Devers & Coachella-Ramon outage w/ RAS Transient Frequency Plots

11

2011 Heavy Summer Post-Cluster Base Case No Outage Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster Base Case No Outage Transient Frequency Plots

12

2011 Heavy Summer Post-Cluster Base Case Imperial Valley – El Centro 230 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster Base Case Imperial Valley – El Centro 230 kV line outage Transient Frequency Plots

13

2011 Heavy Summer Post-Cluster Base Case Coachella – Devers 230 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster Base Case Coachella – Devers 230 kV line outage Transient Frequency Plots

14

2011 Heavy Summer Post-Cluster Base Case Ramon – Mirage 230 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster Base Case Ramon – Mirage 230 kV line outage Transient Frequency Plots

15

2011 Heavy Summer Post-Cluster Base Case Imperial Valley – Miguel 500 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster Base Case Imperial Valley– Miguel 500 kV line outage Transient Frequency Plots

16

2011 Heavy Summer Post-Cluster Base Case N. Gila - Imperial Valley 500 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster Base Case N. Gila - Imperial Valley 500 kV line outage Transient Frequency Plots

17

2011 Heavy Summer Post-Cluster Base Case Palo Verde - Devers 500 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster Base Case Palo Verde - Devers 500 kV line outage Transient Frequency Plots

18

2011 Heavy Summer Post-Cluster Base Case ELSTM2 and REPU2 generator outages Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster Base Case ELSTM2 and REPU2 generator outages Transient Frequency Plots

19

2011 Heavy Summer Post-Cluster Base Case Path 42 outage w/ RAS Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster Base Case Path 42 outage w/RAS Transient Frequency Plots

20

2011 Heavy Summer Post-Cluster Base Case Coachella –Devers & Coachella-Ramon outage w/ RAS Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster Base Case Coachella –Devers & Coachella-Ramon outage w/ RAS Transient Frequency Plots

21

2011 Heavy Summer Post-Cluster w/ Mitigation Case No Outage Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster w/ Mitigation Case No Outage Transient Frequency Plots

22

2011 Heavy Summer Post-Cluster w/ Mitigation Case Imperial Valley – El Centro 230 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster w/ Mitigation Case Imperial Valley – El Centro 230 kV line outage Transient Frequency Plots

23

2011 Heavy Summer Post-Cluster w/ Mitigation Case Coachella – Devers 230 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster w/ Mitigation Case Coachella – Devers 230 kV line outage Transient Frequency Plots

24

2011 Heavy Summer Post-Cluster w/ Mitigation Case Ramon – Mirage 230 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster w/ Mitigation Case Ramon – Mirage 230 kV line outage Transient Frequency Plots

25

2011 Heavy Summer Post-Cluster w/ Mitigation Case Imperial Valley – Miguel 500 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster w/ Mitigation Case Imperial Valley– Miguel 500 kV line outage Transient Frequency Plots

26

2011 Heavy Summer Post-Cluster w/ Mitigation Case N. Gila - Imperial Valley 500 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster w/ Mitigation Case N. Gila - Imperial Valley 500 kV line outage Transient Frequency Plots

27

2011 Heavy Summer Post-Cluster w/ Mitigation Case Palo Verde - Devers 500 kV line outage Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster w/ Mitigation Case Palo Verde - Devers 500 kV line outage Transient Frequency Plots

28

2011 Heavy Summer Post-Cluster w/ Mitigation Case ELSTM2 and REPU2 generator outages Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster w/ Mitigation Case ELSTM2 and REPU2 generator outages Transient Frequency Plots

29

2011 Heavy Summer Post-Cluster w/ Mitigation Case Path 42 outage w/ RAS Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster w/ Mitigation Case Path 42 outage w/RAS Transient Frequency Plots

30

2011 Heavy Summer Post-Cluster w/ Mitigation Case Coachella –Devers & Coachella-Ramon outage w/ RAS Transient Bus Voltage Plots

2011 Heavy Summer Post-Cluster w/ Mitigation Case Coachella –Devers & Coachella-Ramon outage w/ RAS Transient Frequency Plots

31

2011 Light Winter Transient Stability Plots

32

2011 Light Winter Pre-Cluster Base Case No Outage Transient Bus Voltage Plots

2011 Light Winter Pre-Cluster Base Case No Outage Transient Frequency Plots

33

2011 Light Winter Pre-Cluster Base Case Imperial Valley – El Centro 230 kV line outage Transient Bus Voltage Plots

2011 Light Winter Pre-Cluster Base Case Imperial Valley – El Centro 230 kV line outage Transient Frequency Plots

34

2011 Light Winter Pre-Cluster Base Case Coachella – Devers 230 kV line outage Transient Bus Voltage Plots

2011 Light Winter Pre-Cluster Base Case Coachella – Devers 230 kV line outage Transient Frequency Plots

35

2011 Light Winter Pre-Cluster Base Case Ramon – Mirage 230 kV line outage Transient Bus Voltage Plots

2011 Light Winter Pre-Cluster Base Case Ramon – Mirage 230 kV line outage Transient Frequency Plots

36

2011 Light Winter Pre-Cluster Base Case Imperial Valley – Miguel 500 kV line outage Transient Bus Voltage Plots

2011 Light Winter Pre-Cluster Base Case Imperial Valley– Miguel 500 kV line outage Transient Frequency Plots

37

2011 Light Winter Pre-Cluster Base Case N. Gila - Imperial Valley 500 kV line outage Transient Bus Voltage Plots

2011 Light Winter Pre-Cluster Base Case N. Gila - Imperial Valley 500 kV line outage Transient Frequency Plots

38

2011 Light Winter Pre-Cluster Base Case Palo Verde - Devers 500 kV line outage Transient Bus Voltage Plots

2011 Light Winter Pre-Cluster Base Case Palo Verde - Devers 500 kV line outage Transient Frequency Plots

39

2011 Light Winter Pre-Cluster Base Case ELSTM2 and REPU2 generator outages Transient Bus Voltage Plots

2011 Light Winter Pre-Cluster Base Case ELSTM2 and REPU2 generator outages Transient Frequency Plots

40

2011 Light Winter Pre-Cluster Base Case Path 42 outage w/ RAS Transient Bus Voltage Plots

2011 Light Winter Pre-Cluster Base Case Path 42 outage w/RAS Transient Frequency Plots

41

2011 Light Winter Pre-Cluster Base Case Coachella –Devers & Coachella-Ramon outage w/ RAS Transient Bus Voltage Plots

2011 Light Winter Pre-Cluster Base Case Coachella –Devers & Coachella-Ramon outage w/ RAS Transient Frequency Plots

42

2011 Light Winter Post-Cluster Base Case No Outage Transient Bus Voltage Plots

2011 Light Winter Post-Cluster Base Case No Outage Transient Frequency Plots

43

2011 Light Winter Post-Cluster Base Case Imperial Valley – El Centro 230 kV line outage Transient Bus Voltage Plots

2011 Light Winter Post-Cluster Base Case Imperial Valley – El Centro 230 kV line outage Transient Frequency Plots

44

2011 Light Winter Post-Cluster Base Case Coachella – Devers 230 kV line outage Transient Bus Voltage Plots

2011 Light Winter Post-Cluster Base Case Coachella – Devers 230 kV line outage Transient Frequency Plots

45

2011 Light Winter Post-Cluster Base Case Ramon – Mirage 230 kV line outage Transient Bus Voltage Plots

2011 Light Winter Post-Cluster Base Case Ramon – Mirage 230 kV line outage Transient Frequency Plots

46

2011 Light Winter Post-Cluster Base Case Imperial Valley – Miguel 500 kV line outage Transient Bus Voltage Plots

2011 Light Winter Post-Cluster Base Case Imperial Valley– Miguel 500 kV line outage Transient Frequency Plots

47

2011 Light Winter Post-Cluster Base Case N. Gila - Imperial Valley 500 kV line outage Transient Bus Voltage Plots

2011 Light Winter Post-Cluster Base Case N. Gila - Imperial Valley 500 kV line outage Transient Frequency Plots

48

2011 Light Winter Post-Cluster Base Case Palo Verde - Devers 500 kV line outage Transient Bus Voltage Plots

2011 Light Winter Post-Cluster Base Case Palo Verde - Devers 500 kV line outage Transient Frequency Plots

49

2011 Light Winter Post-Cluster Base Case ELSTM2 and REPU2 generator outages Transient Bus Voltage Plots

2011 Light Winter Post-Cluster Base Case ELSTM2 and REPU2 generator outages Transient Frequency Plots

50

2011 Light Winter Post-Cluster Base Case Path 42 outage w/ RAS Transient Bus Voltage Plots

2011 Light Winter Post-Cluster Base Case Path 42 outage w/RAS Transient Frequency Plots

51

2011 Light Winter Post-Cluster Base Case Coachella –Devers & Coachella-Ramon outage w/ RAS Transient Bus Voltage Plots

2011 Light Winter Post-Cluster Base Case Coachella –Devers & Coachella-Ramon outage w/ RAS Transient Bus Voltage Plots

52

2011 Light Winter Post-Cluster w/ Mitigation Case No Outage Transient Bus Voltage Plots

2011 Light Winter Post-Cluster w/ Mitigation Case No Outage Transient Frequency Plots

53

2011 Light Winter Post-Cluster w/ Mitigation Case Imperial Valley – El Centro 230 kV line outage Transient Bus Voltage Plots

2011 Light Winter Post-Cluster w/ Mitigation Case Imperial Valley – El Centro 230 kV line outage Transient Frequency Plots

54

2011 Light Winter Post-Cluster w/ Mitigation Case Coachella – Devers 230 kV line outage Transient Bus Voltage Plots

2011 Light Winter Post-Cluster w/ Mitigation Case Coachella – Devers 230 kV line outage Transient Frequency Plots

55

2011 Light Winter Post-Cluster w/ Mitigation Case Ramon – Mirage 230 kV line outage Transient Bus Voltage Plots

2011 Light Winter Post-Cluster w/ Mitigation Case Ramon – Mirage 230 kV line outage Transient Frequency Plots

56

2011 Light Winter Post-Cluster w/ Mitigation Case Imperial Valley – Miguel 500 kV line outage Transient Bus Voltage Plots

2011 Light Winter Post-Cluster w/ Mitigation Case Imperial Valley– Miguel 500 kV line outage Transient Frequency Plots

57

2011 Light Winter Post-Cluster w/ Mitigation Case N. Gila - Imperial Valley 500 kV line outage Transient Bus Voltage Plots

2011 Light Winter Post-Cluster w/ Mitigation Case N. Gila - Imperial Valley 500 kV line outage Transient Frequency Plots

58

2011 Light Winter Post-Cluster w/ Mitigation Case Palo Verde - Devers 500 kV line outage Transient Bus Voltage Plots

2011 Light Winter Post-Cluster w/ Mitigation Case Palo Verde - Devers 500 kV line outage Transient Frequency Plots

59

2011 Light Winter Post-Cluster w/ Mitigation Case ELSTM2 and REPU2 generator outages Transient Bus Voltage Plots

2011 Light Winter Post-Cluster w/ Mitigation Case ELSTM2 and REPU2 generator outages Transient Frequency Plots

60

2011 Light Winter Post-Cluster w/ Mitigation Case Path 42 outage w/ RAS Transient Bus Voltage Plots

2011 Light Winter Post-Cluster w/ Mitigation Case Path 42 outage w/RAS Transient Frequency Plots

61

2011 Light Winter Post-Cluster w/ Mitigation Case Coachella –Devers & Coachella-Ramon outage w/ RAS Transient Bus Voltage Plots

2011 Light Winter Post-Cluster w/ Mitigation Case Coachella –Devers & Coachella-Ramon outage w/ RAS Transient Frequency Plots