4.1. ERMUSR 03-17-2015 - Laserfiche WebLink

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unit is minutes. This index enables the utility to report how many minutes'customers would have been out of service if all customers were out at one time. ERMU's 2014 SAIDI is 28.54 minutes ERMU's 2013 SAIDI was 5.97 minutes Our utility's SAIDI: 28.54 Average SAIDI for Utilities Within our Region 55.49 Average SAIDI for Utilities Within our Customer Size Class 87.14 System Average Interruption Frequency Index(SAIFI) SAIFI is defined as the average number of times that a customer is interrupted during a specified time period. It is determined by dividing the total number of customers interrupted in a time period by the average number of customers served. The resulting unit is"interruptions per customer." ERMU's 2014 SAIFI is 0.1428 ERMU's 2013 SAIFI was 0.0505 Our utility's SAIFI: 0.143 Average SAIFI for Utilities Within our Region 0.817 Average SAIFI for Utilities Within Your Customer Size Class 0.839 Another statistic staff gets concerned about is the average length of any outage. Elk River Municipal Utilities' 2014 average length of outage was 131.07 minutes. In 2013 the average length of outage was 116.84 minutes. Electric utilities with a high percentage of underground facilities will exhibit higher length of outage time than electric utilities with more overhead facilities. Staff reviews these statistics in detail to find ways to continually improve our system. These statistics are very good compared to other utilities. In 2014,birds and animals caused the greatest number of outages resulting in 31.25%of our outage incidents. Outages resulting from branches and/or trees made up 2.08% of our outage incidents. This low percentage is a reflection of the good tree trimming our crews do during the winter. Other contributing factors include: underground faults 16.67%; dig-ins, etc. 6.25%; component failure 4.17%; transformer failure 4.17%; fuse failure 10.42%; connector failure 12.50%; vehicle vs. pole 10.42%; and weather related outages accounted for 2.08%of the incidents. Many investor owned and cooperative run utilities "storm normalize"their reliability numbers by removing"major outages"due to storms from their reliability index number calculations. Our reliability numbers have not been storm normalized. Our numbers reflect these major outages and represent what our customer actually experienced in 2014. Overall, our electric distribution system is robust and our reliability is very high. ACTION REQUESTED: No action is required. ATTACHMENT: • American Public Power Association's eReliablity Tracker 2014 Annual Report POWERED 01 Page 3 of 3 NATURE Reliable Public Power Provider P O W E R E D T O S E R V E 51