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11.2. System Average Interruption Frequency Index <br />SAIFI is the average instances a customer on the utility system will experience a <br />sustained interruption during a specific time frame. <br />Since SAIFI is a sustained interruption index, only outages lasting longer than five <br />minutes are included in the calculations. SAIFI is calculated by dividing the total <br />number of customers that experienced sustained interruptions by the average number <br />of customers served during that period. For example, a utility with 150 customer <br />interruptions and 200 customers would have a SAIFI of 0.75. <br />Note that in the tables below, scheduled and unscheduled calculations include MEs. <br />Also note that wherever MEs are excluded, the exclusion is based on the APPA ME <br />threshold for your system. <br />Table 4. Average SAIFI with and without MEs <br />In interruptions <br />Your utility <br />Utilities that use the eReliability Tracker <br />Utilities in your region <br />Utilities in your size class <br />All <br />No MEs <br />Unscheduled <br />Scheduled <br />0.15 <br />0.15 <br />0.1 <br />0.04 <br />0.77 <br />0.52 <br />0.74 <br />0.05 <br />0.51 <br />0.41 <br />0.49 <br />0.03 <br />10.631 <br />0.411 <br />0.611 <br />0.03 <br />Table 5. Summary SAIFI data from the eReliability Tracker <br />In interruptions <br />All <br />I No MEs <br />Unscheduled <br />Scheduled <br />Minimum <br />0 <br />0 <br />0 <br />0 <br />First Quartile <br />0.21 <br />0.15 <br />0.2 <br />0 <br />Median <br />0.59 <br />0.37 <br />0.55 <br />0.01 <br />Third Quartile <br />1.08 <br />0.721 <br />1.051 <br />0.04 <br />Maximum <br />13.441 <br />2.921 <br />3.44 <br />1.04 <br />Figure 4. Average SAIFI by region <br />1.4 <br />0 1.2 <br />a <br />� 1.0 <br />v <br />c 0.6 <br />LL <br />Q 0.6 <br />N <br />Q 0.4 <br />j 0.2 <br />Q <br />0.0 <br />Regions <br />8 <br />190 <br />