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M. Outage Causes <br />Equipment failure, extreme weather events, wildlife, and vegetation are some of the <br />most common causes of electric system outages.The following pie chart shows the <br />percentages of the primary causes of outages for all utilities using the eReliability <br />Tracker in 2022. <br />lent <br />Vegetation <br />Utility Human Error <br />Power Supply <br />Public <br />1q- <br />Unknown <br />Figure 8. Primary causes of outages in 2022 <br />Certain factors, such as regional weather and animal/vegetation patterns, can make <br />some causes more prevalent for a specific group of utilities. The following section <br />includes graphs depicting common causes of outages for your utility, all utilities in your <br />region, and all utilities using the eReliability Tracker. <br />Charts containing aggregate information are customer -weighted to account for <br />differences in utility size for a better analytical comparison. For example, a particularly <br />large utility may have a large number of outages compared to a small utility. To avoid <br />skewing the data toward large utilities, the number of cause occurrences is divided by <br />customer size to account for the differences. In Figures 9 -14, the data represent the <br />15 <br />197 <br />