PUC Annual Report–Fiscal Year 2004-05 - Public Utilities Commission

Public Utilities Commission Annual Report 2004-05State of Hawaii Page 72The reliability indices are calculated using the data from all system outages exceptcustomer maintenance outages. MECO has not normalized any data for 2000, 2001, 2002, and2003. Normalizing of data would be in accordance with the guidelines specified in the report onreliability that was prepared for the Commission, titled “Methodology for Determining ReliabilityIndices for HECO Utilities,” dated December 1990.MECO has not normalized data since 1996. The 2004 reliability indices for MECOexclude the effects of the January 14 th Kona storm. Data was normalized because the outagesmet normalizing guidelines published in the December 1990 report, “Methodology for DeterminingReliability Indices.”Graphs of the ASA (Figure 46), SAIF (Figure 47), CAID (Figure 48), and SAID (Figure 49)for the five (5) years are included below.The 2004 service reliability results are normalized to exclude the January 14, 2004 KonaStorm, when extremely high winds of 50 to 80 mph were experienced on parts of Maui.Another factor affecting the Indices in 2004 was the incorporation of new customercounts for each circuit, standardizing MECO’s Indices with HECO and HELCO. As a result, the2004 Indices rank fifth for the last five (5) years, with the exception of CAID, which is a recordbest for MECO, thus setting a new benchmark for succeeding years.better.)The ASA index of 99.9858% is ranked fifth best for the last five (5) years. (Higher isThe SAIF index of 1.608 is ranked fifth best for the last five (5) years. (Lower is better.)The CAID index of 46.54 minutes is a record best for MECO. (Lower is better).better).The SAID index of 74.82 minutes is ranked fifth best for the last five (5) years. (Lower isTree related outages accounted for 13.07% of the total of all outages for 2004. Thisremains relatively unchanged from 2003 due to a tree trimming program which continues to havethe support and joint effort of county government and private landowners.Weather related outages accounted for 10.34% of the total of all outages for 2004, withhigh wind related causes affecting 23,814 customers.Another Kona Storm on February 27 th and February 28 th caused considerable damagedue to thunderstorms, rain and high winds, and was not excluded in the normalized data like theJanuary 14 th storm.The normalized results for 2004 and the previous unnormalized four (4) years 2000 to2003 are shown in the table “MECO Table of Annual Service Reliability Indices.” Figures 46 to 49contain the same data shown in graphical form.MECO Table of Annual Service Reliability Indices2000 2001 2002 2003 2004Number of Customers 57,000 58,308 59,410 60,651 61,846Customer Hrs.38,288 50,665 29,201 48,567 77,122InterruptedCustomer-Interruptions 27,987 37,691 34,388 45,446 99,424ASA (Percent) 99.9929 99.9901 99.9943 99.9908 99.9858SAIF (Occurrence) 0.491 0.646 0.579 0.749 1.608CAID (Minutes) 75.65 80.65 50.95 64.12 46.54SAID (Minutes) 37.15 52.14 29.49 48.05 74.82