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Elk River <br />Municipal Utilities <br />13069 Orono Parkway • P.O. Box 430 <br />Elk River, MN 55330-0430 <br />January 6, 2010 <br />To: Elk River Municipal Utilities Commission <br />John Dietz <br />Jerry Gumphrey <br />Daryl Thompson <br />From: Troy Adams <br />Subject: Review 2009 Electric Reliability Report <br />5~~ <br />Phone: 763.441.2020 <br />Fax: 763.441.8099 <br />The Minnesota Energy, Security and Reliability Act requires electric distribution utilities to file an annual <br />outage report to their governing bodies, which in our case, to the Elk River Municipal Utilities <br />commission. <br />The attached spread sheet reflects the outage history for 2009. Animals and branches continue to cause <br />the greatest number of outages. Underground faults were also a contributing factor. The single greatest <br />incident impacting the report is a car accident where the vehicle hit a pole. <br />The table below reflects the number of customer outage minutes from 2002 through 2009. <br />Year # of Customers # of Outa a Minutes # of Outa es <br />2002 6669 356,340 50 <br />2003 7193 39,285 54 <br />2004 7773 393,926 84 <br />2005 8398 558,140 59 <br />2006 8804 314,510 73 <br />2007 9163 67,845 47 <br />2008 9067 155,768 57 <br />2009 9170 46,706 49 <br />A number. of reliability indexes are used in the electric industry to make it easier to compare performance <br />of electric utilities. These reliability indexes are: <br />1. ASAI (average service availability index) <br />ASAI is a measure of the average availability of the sub-transmission and distribution systems to <br />serve customers. It is the ratio of the total customer minutes that service was available to the total <br />customer minutes available in a time period. This is normally expressed as a percentage. <br />ERMU's 2009 ASAI is 99.999%. Availability <br />