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II.7. Analysis of Miles of Line and Interruptions <br />Benchmarking metrics were created to help utilities explore the relationship between outages, line <br />exposure, and customer density. This analysis separates utilities into groups of similar average customer <br />density (customers served per mile). As seen in Table 15, the customer density distribution of utilities that <br />use the eReliability Tracker is split into five distinct customer density size groups of approximately 64 <br />4 <br />utilities. By using the miles of line-related metrics shown in Table 14 and Table 15, utilities can <br />benchmark reliability against system characteristics along with the customer normalized metrics included <br />in the rest of 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 dense and <br />exposed utilities. <br />315 <br />Your utility's total miles of line: <br />95 <br />Your utility's overhead miles of line: <br />220 <br />Your utility's underground miles of line: <br />Table 14. Analysis of total miles of line and interruptions <br />Interruptions per MileCustomers Interrupted Minutes of Interruption <br />per Mileper Mile <br /> Your Utility0.1916.5219.22 <br /> Average for eReliability Tracker Utilities0.4338.50137.37 <br /> Average for Utilities Within Your Region0.5038.1490.81 <br />39.62 <br />Your utility's average customer density (customers per mile): <br />Your utility belongs to customer density class <br />2 <br />Table 15. Total miles of line analysis by customer density class <br />Customer Density Class Customer Density Interruptions per MileCustomers Minutes of <br />(Customers per Mile)RangeInterrupted per MileInterruption per Mile <br />Class 11 -300.2318.49108.43 <br />Class 231 - 450.3522.7956.89 <br />Class 346 - 620.4828.05304.29 <br />Class 463 - 880.5040.75132.25 <br />Class 589 - 16600.5982.4793.46 <br />4Customer density classes include eReliability Tracker utilities that either provided their miles of line data to Platts or recorded their data in the <br />eReliability Tracker. <br />11 <br />65 <br />