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Elk River Comp ehensive Plan <br /> ELKRIVER <br /> EN=RGYCITY <br /> Electric System <br /> The Elk River Municipal Utilities operates an electric system in the City of Elk River that provides service <br /> to approximately 44 square miles as shown in Figure 8-4: Electrical Distribution Territory Map. The ERMU <br /> purchases power from Connexus Energy and constructs and operates the distribution system, including lines <br /> and substations, needed to provide power in its service area. There are approximately 315 miles of electric <br /> lines throughout the City, of which approximately 70% are underground. As part of the long term growth <br /> plan for the City of Elk River the utility has added an additional 65,000 kW of substation capacity to the <br /> distribution system since 2004. <br /> Elk River Municipal Utilities (ERMU) received national recognition in 2011 when awarded a high honor for <br /> having reliable and safe electric service. There are more than 2,000 public power utilities and ERMU is one of <br /> only 176 receiving the Reliable Public Power Provider (RP3®) award. The award is based off of four categories: <br /> reliability, safety, workforce development and system improvement. <br /> ERMU's reliability index numbers reflect the condition of its robust electrical system as well as its <br /> commitment to long term growth and superb customer service. The ERMU reliability numbers are <br /> comparing extremely well to other electric utilities in Minnesota. Elk River Municipal Utilities' 2012 <br /> reliability numbers were as follow: <br /> 1. ASAI (average service availability index) is 3. SAIDI (system average interruption duration <br /> a measure of the average availability of the index) is defined as the average interruption <br /> sub-transmission and distribution systems to duration for customers served during a specified <br /> serve customers. It is the ratio of the total time period. It is determined by summing the <br /> customer minutes that service was available customer minutes off for each interruption <br /> to the total customer minutes available in during a specified time period and dividing <br /> a time period. This is normally expressed that sum by the average number of customers <br /> as a percentage. ERMU's 2012 ASAI is served during that period. The unit is minutes. <br /> 99.999% Availability. This index enables the utility to report how <br /> 2. CAIDI (customer average interruption many minutes' customers would have been out <br /> duration index) is defined as the average of service if all customers were out at one time. <br /> length of an interruption weighted by ERMU's 2012 SAIDI is 7.7 minutes. <br /> the number of customers affected. It 4. SAIFI (system average interruption frequency <br /> is calculated by summing the customer index) is defined as the average number of <br /> minutes off during each interruption in the times that a customer is interrupted during <br /> time period and dividing this by the number a specified time period. It is determined <br /> of customers experiencing one or more by dividing the total number of customers <br /> sustained interruptions during the time interrupted in a time period by the average <br /> period. The resulting unit is minutes. The number of customers served. The resulting unit <br /> index enables utilities to report the average is "interruptions per customer." ERMU's 2012 <br /> duration of a customer outage for those SAIFI is 0.117. <br /> customers affected. ERMU's 2012 CAIDI is <br /> 66 minutes. <br /> 92 / Chapter 8: Utilities <br />