5.4. ERMUSR 03-12-2019 - Laserfiche WebLink

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System Average Interruption Duration Index (SAIDI) SAIDI is defined as the average interruption duration (in minutes) for customers served by the utility system during a specific time period. Since SAIDI is a sustained interruption index, only outages lasting longer than five minutes are included in the calculations. SAIDI is calculated by dividing the sum of all customer interruption durations within the specified time frame by the average number of customers served during that period. For example, a utility with 100 customer minutes of outages and 100 customers would have a SAIDI of 1. Note that in the tables below, scheduled and unscheduled calculations include major events. Also note that wherever major events are excluded, the exclusion is based on the APPA major event threshold. Table 2 Average SAIDI for all utilities that use the eReliability Tracker(with and without MEs), belong to your region, and are grouped in your customer size class All No MEs Unscheduled Scheduled Your utility's SAIDI 10.009 10.009 9.949 0.057 Average eReliability Tracker SAIDI 202.449 69.0185 185.0572 17.463 Average SAIDI for Utilities Within Your Region 133.1295 67.3469 131.5411 1.5907 Average SAIDI for Utilities Within Your Customer Size Class 221.2008 34.0534 206.258 14.9341 Table 3 Summary statistics of the SAIDI data compiled from the eReliability Tracker All No MEs Unscheduled Scheduled Minimum Value 0.283 0.283 0.186 0 First Quartile(25th percentile) 21.647 12.203 19.69 0 Median Quartile(50th percentile) 53.2225 27.084 52.313 0.134 Third Quartile(75th percentile) 141.0617 63.238 131.51 2.086 Maximum Value 8746.1 1843.61 8743.182 1580.062 Figure 3 Average SAIDI for all utilities that use the eReliability Tracker per region 900- 800 767.7695 w 700- E 600- 0 500- .4 400- 315.8426 275.3225 m 300- 234.8737 200- 174.2614 141.5934 126.5944 133.1295 103.0168 100 ■ 111 ■ . . 1 2 3 4 5 6 7 8 9 10 Association Regions 5 85