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15 <br />III.1. Sustained Outage Causes <br />In general, sustained outages are the most commonly tracked outage type. In analyses of <br />sustained outages, utilities tend to exclude scheduled outages, partial power, customer- <br />related problems, and qualifying major events from their reliability indices calculations. <br />While this is a valid method for reporting, these outages should be included for internal <br />review to make utility-level decisions. In this section, we evaluate common causes of <br />sustained outages for your utility, corresponding region, and for all utilities that use the <br />eReliability Tracker. It is important to note that in this report, sustained outages are <br />classified as outages that last longer than five minutes, as defined by IEEE 1366. <br />Figure 8. Top five causes of sustained outages for all utilities that use the eReliability <br />Tracker <br />Figure 9.Top five customer-weighted occurrence rates for common causes of sustained <br />outages for your utility [1] <br />263