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13 <br />II.7. Analysis of Miles of Line and Interruptions <br />Analyzing metrics on interruptions by miles of line can help utilities explore the <br />relationship between outages, line exposure, and customer density. This analysis <br />separates utilities into groups of similar average customer density (customers served per <br />mile). As seen in Table 15, utilities that use the eReliability Tracker were split into five <br />customer density groups of approximately 79 utilities each. Note that customer density <br />classes include utilities that either provided their miles of line data to S&P Global Platts or <br />recorded their data in the eReliability Tracker. By using the miles of line-related metrics <br />shown in Table 14 and Table 15, you can benchmark your utility’s reliability against <br />system characteristics along with the customer normalized metrics included in the rest of <br />the report. These system topography-related metrics can be helpful in understanding, for <br />example, utility reliability against weather and animal-related outages relative to similarly <br />dense and exposed utilities. <br />Your utility's total miles of line: 315.0 <br />Your utility's overhead miles of line: 95.0 <br />Your utility's underground miles of line: 220.0 <br />Table 14. Total miles of line and interruptions <br />Customers <br />Interrupted per Mile <br />Interruptions <br />per Mile <br />Minutes of <br />Interruption per Mile <br />Your utility 6 1 18.47 <br />Utilities that use the <br />eReliability Tracker 245 3 522.39 <br />Utilities in your region 463 4 522.98 <br />Your utility's average customer density (customers per mile): 40 <br />Your utility's belongs to customer density class 2. <br />Table 15. Total miles of line analysis by customer density class <br />Customer Density <br />Class (Customers per <br />Mile) <br />Customer <br />Density <br />Range <br />Customers <br />Interrupted <br />per Mile <br />Interruptions <br />per Mile <br />Minutes of <br />Interruption <br />per Mile <br />Class 1 0 - 30 21 1 68.02 <br />Class 2 30 - 46 35 1 135.24 <br />Class 3 46 - 63 38 1 669.32 <br />Class 4 63 - 90 61 1 81.18 <br />Class 5 90 - 13200 1121 11 1680.84 <br />261