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11.1. System Average Interruption Duration Index <br />SAIDI is the average duration (in minutes) of an interruption per customer served by <br />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"' within the specified time frame by the average <br />number of customers served during that period. For example, a utility with 100 <br />customer minutes of interruption and 100 customers would have a SAIDI of 1. <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 2. Average SAIDI with and without MEs <br />In minutes <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 />13.29 <br />13.29 <br />10.47 <br />2.81 <br />115.7 <br />67.27 <br />112.51 <br />5.31 <br />98.67 <br />85.01 <br />97.42 <br />1.79 <br />179.211 <br />40.741 <br />76.261 <br />4.22 <br />Table 3. Summary SAIDI data from the eReliability Tracker <br />In minutes <br />All <br />No MEs <br />Unscheduled <br />Scheduled <br />Minimum <br />0 <br />0 <br />0 <br />0 <br />First Quartile <br />18.81 <br />11.32 <br />16.84 <br />0.2 <br />Median <br />47.3 <br />26.17 <br />46.43 <br />1.1 <br />Third Quartile <br />1 118.671 <br />53.611 <br />113.371 <br />4.12 <br />Maximum <br />13365.0813365.081 <br />3365.081 <br />122.86 <br />Figure 3. Average SAIDI by region <br />250 <br />LA <br />v <br />C 200 <br />E <br />Q 50 <br />Regions <br />6 <br />188 <br />