1.32
1.33
1.36
1.39
1.55
1.46
1.49
1.58
1.71
1.70
1.04
1.07
1.08
1.08
1.16
1.17
1.12
1.34
1.33
1.36
0.86
0.86
0.85
0.89
0.96
0.92
0.89
1.06
1.06
1.11
1.09
1.39
1.63
Utilities have increased reliability by reducing the frequency of service outages…
System average interruption frequency index (saifi) by quartile
Annual interruptions per customer, ieee standard major event days (med) removed
2015
2014
2013
2012
2011
2010
2009
2008
2007
2006
2005
Q2
Q3
Q4
Q1
Median
Q2
Q3
Q4
Q1
2015
2014
2013
2012
2011
2010
2009
2008
2007
2006
2005
127
127
127
130
130
122
121
135
127
131
83
82
85
93
83
88
99
93
92
91
94
111
104
107
110
117
106
102
110
109
108
105
127
...but while there are fewer outages, they tend to be longer.
Customer average interruption duration index (caidi) by quartile
Average minutes per interruption, ieee standard major event days (med) removed
Median