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II. IEEE Statistics <br />I imithmtnet;i=ee1iability, the industry standard metrics are de <br />Electrical and Electronics Engineers' Guide for Electric Power Distribution Reliability Indices, or <br />IEEE 1366 guidelines. For each utility, the eReliability Tracker performs IEEE 1366 calculations <br />for System Average Interruption Duration Index (SAIDI), System Average Interruption <br />Frequency Index (SAIFI), Customer Average Interruption Duration Index (CAIDI), Momentary <br />Average Interruption Frequency Index (MAIFI), and Average Service Availability Index (ASAI). <br />It is important to note how major events (MEs) are calculated and used in this report. An <br />example of an ME includes severe weather, such as a tornado or hurricane, that leads to <br />unusually long outages in comparison to your distribution system's typical outage. This report <br />uses the A9113hAlVdium ftildctly on the SAIDI for speci <br />rather than a daily SAIDI. The APPA ME threshold allows a utility to remove outages that <br />exceed the IEEE 2.5 beta threshold for outage events, which considers up to 10 years of the <br />utility's outage history. In the eReliability Tracker, if a utility does not have at least 36 outage <br />events prior to the year being analyzed, then no threshold is calculated. If this is the case for <br />OWiatudilfbft tiabul,,ectiomlh idveutNULL value in the following <br />MEs in the SAIDI, SAIFI, CAIDI, and ASAI sections of this report will be the same as the <br />calculations with MEs for your utility. More outage history will provide a better threshold for <br />your utility. <br />VvA&dtifity's APPA major event threshold is <br />For each of the reliability indices, this report displays your utility's metrics alongside the mean <br />values for all utilities using the eReliability Tracker and within the same class and region as <br />gk=btdivyi.tft-eeach of the following subsections allows you to better <br />understand the performance of your electric system relative to other utilities nationwide and <br />to those within your same region or size class. The second table breaks down the national <br />data into quartile ranges, a minimum value, and a maximum value. <br />All indices, except MAIFI, are calculated for outages with and without MEs. Furthermore, the <br />tables show indices for scheduled and unscheduled outages. Note that scheduled and <br />unscheduled calculations include MEs. Also note that wherever MEs are excluded, the <br />exclusion is based on the APPA ME threshold for your system. <br />177 <br />