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II.5. Average Service Availability Index (ASAI) <br />ASAI is defined as a measure of the average availability of the sub-transmission and distribution systems <br />that serve customers. <br />This load-based index represents the percentage availability of electric service to customers within the <br />time period analyzed. It is caclulated by dividing the total hours service is available to customers by the <br />total hours that service is demanded by the customers. For example, an ASAI of 99.99% means that <br />electric service was available for 99.99% of the time during the given time period. <br />Table 10. Average ASAI for all utilities that use the eReliability Tracker, belong to your region, and <br />are grouped in your customer size class <br /> Your utility's ASAI (%)99.9951 <br /> Average eReliability Tracker ASAI99.9778 <br /> Average ASAI for Utilities Within Your Region99.9856 <br /> Average ASAI for Utilities Within Your Customer Size Class99.9766 <br />Table 11. Summary statistics of the ASAI data compiled from the eReliability Tracker <br /> Minimum Value99.7721 <br /> First Quartile (25th percentile)99.9787 <br /> Median Quartile (50th percentile)99.9892 <br /> Third Quartile (75th percentile)99.9958 <br /> Maximum Value100.0000 <br />99.99199.982499.985699.9899.970299.955999.971899.982699.9518 <br />100.00 <br />80.00 <br />60.00 <br />40.00 <br />Average ASAI (%) <br />20.00 <br />0.00 <br />12345678910 <br />Association Regions <br />Figure 7. Average ASAI for all utilities that use the eReliability Tracker per region <br />9 <br />63 <br />