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6 <br />II.1. System Average Interruption Duration Index (SAIDI) <br />SAIDI is defined as the average interruption duration (in minutes) for customers served <br />by the utility during a specific time frame. <br />Since SAIDI is a sustained interruption index, only outages lasting longer than five <br />minutes are included in the calculations. SAIDI is calculated by dividing the sum of all <br />customer minutes of interruption [1] within the specified time frame by the average <br />number of customers served during that period. For example, a utility with 100 customer <br />minutes of interruption and 100 customers would have a SAIDI of 1. <br />Indices are calculated for outages with and without MEs; furthermore, the data are broken <br />down to show calculations for scheduled and unscheduled outages. <br />Note that in the tables below, scheduled and unscheduled calculations include MEs. Also <br />note that wherever MEs are excluded, the exclusion is based on APPA’s ME threshold. <br />Table 2. Average SAIDI with and without MEs in minutes <br />All No MEs Unscheduled Scheduled <br />Your utility 15.8 15.8 15.55 0.24 <br />Utilities that use the eReliability Tracker 139.16 56.12 133.67 8.66 <br />Utilities in your region 42.04 31.67 40.67 1.92 <br />Utilities in your customer size class 90.63 36.45 87.85 4.08 <br />Table 3. Summary SAIDI data from the eReliability Tracker <br />All No MEs Unscheduled Scheduled <br />Minimum Value 0 0 0 0 <br />First Quartile 22.46 10.52 19.34 0.16 <br />Median Value 54.65 28.44 48.72 0.91 <br />Third Quartile 119.57 65.5 113.09 4.38 <br />Maximum Value 5782.38 1065.42 5779.68 420 <br />254