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111.1. Sustained Outage Causes <br />In general, sustained outages are the most commonly tracked outage type. In analyses <br />of sustained outages, utilities tend to exclude scheduled outages, partial power, <br />customer -related problems, and qualifying major events from their reliability indices <br />calculations. While this is a valid method for reporting, these outages should be <br />included for internal review to make utility -level decisions. In this section, we evaluate <br />common causes of sustained outages for your utility, corresponding region, and for all <br />utilities that use the eReliability Tracker. It is important to note that sustained outages <br />are classified in this report as outages that last longer than five minutes, as defined by <br />IEEE 1366. <br />Figure 9. Top five causes of sustained outages for all utilities that use the eReliability <br />Tracker <br />O 2.0 <br />0 <br />0 <br />1.5 <br />a <br />c 1.0 <br />v <br />U <br />U <br />0 0.5 <br />0.0 <br />Outage Cause Types <br />Figure 10. Top five causes of sustained outages for your utility"' <br />1.66 <br />1.6 <br />p 1.4 <br />O <br />1.2 <br />L <br />d 1.0 <br />0.8 <br />r- <br />0.6 <br />V <br />0.45 0.45 <br />U 0.4 <br />0 <br />0.23 <br />0.2 <br />0.0 <br />Tree Squirrel Equipment Electrical Failure <br />Outage Cause Types <br />0.23 <br />Vehicle Accident <br />1. The number of occurrences for each cause is divided by the utility's customer count (in thousands) to <br />create an occurrence rate that can be compared across different utility sizes. <br />17 <br />199 <br />