4.2. ERMUSR 02-15-2011 - Laserfiche WebLink

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i Elk River Municipal Utilities ] 3069 Orono Parkway • P.O. Box 430 Elk Raver, MN 55330-0430 UTILITIES COMMISSION MEETING Phone: 763.441.2020 Fax: 763.441.8099 TO: FROM: Elk River Municipal Utilities Commission Troy Adams, P.E. - Director of Operations John Dietz, Chair Daryl Thompson, Trustee Al Nadeau MEETING DATE: AGENDA ITEM NUMBER: Febru 15, 2011 4.2 SUBJECT: U dated 2010 Electric Reliabilit Re or[ BACKGROUND: Minnesota Rules Chapter 7826 Public Utilities Commission Electric Utility Standards cover safety, reliability, service, and reporting requirements. Per 7826.0100(A), municipal utilities are exempt from these requirements. However, the Elk River Municipal Utilities Commission adopted a number of parts of this chapter as a Distribution Reliability Standard policy requiring annual reporting on system reliability. This report was provided to the Utilities Commission in January 2011. DISCUSSION: This report was a focus of discussion at the Staff update following the January Utilities Commission meeting. Staff discussed the major outages of the year and the impact that the quick response has on these reliability numbers. Also, the staff s sense of ownership in the system and high level of workmanship contribute to the system reliability and customer service that are quantified through these indexes. During this discussion it was discovered that there was one outage that was inadvertently omitted. On the fast Saturday of August in 2010 there was a storm that came through Elk River. During this storm, our Substation 14 Bank 3 (located near the Great River Energy Energy Recovery Station) experienced a substation transformer protection component failure due [o a lighting strike. This component failure caused the protective breaker upstream of the substation transformer to open. Our crews responded quickly to transfer the load to the adjacent Substation 14 Bank 4. Although this was a relatively short outage late at night, it did affect a large number of people. Adding this outage doesn't significantly change the overall reliability numbers. However to insure accurate reporting, below are the revised system reliability numbers for 2010: ASAI (average service availability index) ASAI is a measure of the average availability of the sub-transmission and distribution systems to serve customers. It is the ratio of the total customer minutes that service was available to the total customer minutes available in a time period. This is normally expressed as a percentage. ERMU's 2010 ASAI is 99.985% Availability. Last year was 99.999% Availability.