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2003 2004 <br />T}~pes of <br />Faults # of <br />Faults % Customer <br />Minutes <br />% # of <br />Faults <br />% Customer <br />Minutes <br />U.G. Faults 6 1 l.3 1,045 2.7 13 15.5 47,345 12.1 <br />Dig-Ins 2 3.8 3,000 7.6 2 2.4 7,935 2 <br />Termination <br />Failure <br />1 <br />1.9 <br />600 <br />1.7 <br />0 <br />0 <br />0 <br />0 <br />Transformer <br />Failure <br />3 <br />5.7 <br />565 <br />1.4 <br />1 <br />1.2 <br />120 <br />.1 <br />fuse Failure ] 0 18.8 3,445 8.8 9 l 0.7 2,245 .6 <br />Connector 2 3.8 1,830 4.7 6 7.2 755 .2 <br />Branches 1 1.9 450 1.1 17 20.2 11,655 3 <br />Animal 1I 20.6 14,530 37.0 17 20.2 10,695 2.7 <br />Transformer <br />Failure <br />1 <br />1.9 <br />300 <br />.8 <br />2 <br />2.4 <br />555 <br />.1 <br />Lighting <br />Arrestor <br />2 <br />3.8 <br />1;950 <br />5.0 <br />1 <br />1.2 <br />3,000 <br />.7 <br />Weather 10 18.9 10,695 27.2 7 8.3 101,560 25.8 <br />Vehicle Hit <br />Pole <br />3 <br />5.7 <br />415 <br />1.0 <br />9 <br />10.7 <br />207,431 <br />52.7 <br />Wholesale <br />Sup Tier <br />1 <br />1.9 <br />400 <br />1.0 <br />0 <br />0 <br />0 <br />0 <br /> <br /> 53 100 39;225 100 84 100 393,296 100 <br />The above table reflects no alarming trends or patterns. Weather and vehicles hitting <br />poles account for over 75% of customer minute outages. The number of branch outages <br />is up this year which indicates we need to increase our tree trimming efforts. The number <br />of outages, continue to increase due to our system growth. <br />A number of reliability indexes are evolving in the electric industry to make it easier to <br />compare performance of electrical 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 <br />systems to serve customers. It is the ratio of the total customer minutes that service v<~as <br />availab]e to the total customer minutes demanded in a time period. It is normally <br />expressed as a percentage. <br />ERMU's 2004 ASAI is 99.99%. This is a very good percentage for any utility. <br />2. CAIDI (customer average interruption duration index) <br />This is defined as the average length of an interruption, weighted by the number of <br />customers affected, for customers interrupted during a specific time period. It is <br />calculated by summing the customer minutes off during each interruption in the time <br />period and dividing this sum by the number of customers experiencing one or more <br />sustained interruptions during the time period. The resulting unit is minutes. The index <br />