PUC Annual ReportâFiscal Year 2004-05 - Public Utilities Commission

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Public Utilities Commission Annual Report 2004-05State of Hawaii Page 74100Figure 48MECO Customer Average Interruption Duration (CAID)(Lower is better)8080.6575.656064.12Minutes4050.9546.542002000 2001 2002 2003 2004*YearNote: 2004* Data normalized to exclude 1/14/04 storm80Figure 49MECO System Average Interruption Duration (SAID)(Lower is better)74.826052.14Minutes4037.1548.0529.492002000 2001 2002 2003 2004*YearNote: 2004* Data normalized to exclude 1/14/04 storm
Public Utilities Commission Annual Report 2004-05State of Hawaii Page 753. HELCO 2004 SERVICE QUALITY – NORMALIZED ANDUNNORMALIZED RESULTS.The following HELCO electric utility service quality discussion is based on or excerpteddirectly from the HELCO Annual Service Reliability Report 2004 submitted to the Commission byHELCO. The report covers the 2004 calendar year. A complete copy is available for review atthe Commission’s office and will be made available on the Commission’s website.The average customer count in 2004 was 70,124, an increase of about 6% over 2003.In 2004 a total of 417,462 customer interruptions and a total of 388,891 customer hours ofinterruption were recorded. The SAIF index was 5.953 and the CAID index was 55.89 minutes.Storms and generation related outages severely impacted HELCO’s system reliability in 2004.Storms during the first three (3) months of the year and again in November brought highwinds and lightning that caused 81,052 customer interruptions and a total of 92,229 customerhours of interruption. Storm conditions were experienced on January 14-15, January 23-29,February 27-March 2, and November 23-28. The stormy conditions experienced on February 27,caused damage that required several days to complete repairs. This storm alone accounted for13,295 customer interruptions and 26,896 hours of customer interruption. Much of the stormrelated damage was due to high winds causing trees and branches to fall into power lines. A totalof 68,108 customer interruptions were related to trees and branches in 2004 of which 55,940were attributed to stormy conditions. There were a total of 24,030 customer interruptions due tohigh winds and 57,022 customer interruptions due to lightning in 2004.There were 230,670 generation related customer interruptions in 2004, of which 89,233were related to HELCO generation sources and 141,437 were related to non-HELCO generationsources. In 2004 Hamakua Energy Partners (“HEP”) was the only non-HELCO generationsource to cause customer interruptions.Other leading causes of customer interruptions were equipment failure causing 26,601customer interruptions, automobile accidents causing 10,809 customer interruptions and cablefault causing 6,272 customer interruptions.In 2004 HELCO normalized data per guidelines specified in a special report on reliabilityprepared for the Commission. This report, "Methodology for Determining Reliability Indices forHELCO Utilities," dated December 1990, indicates that normalization may be utilized for"abnormal" situations such as hurricanes, tsunamis, earthquakes, floods, catastrophic equipmentfailures, and a single equipment outage that cascades into a loss of load that is greater than 10%of the system peak load. HELCO has normalized data for the 2004 events listed below:• Severe weather events occurring on:o January 14-15 due to high windso January 23-29 due to storm conditionso February 27 – March 2 due to storm conditionso November 23-28 due to storm conditions• Underfrequency Load shedding events on:o January 19 due to HELCO CT-4o January 20 due to HEPo February 20 due to HEPo March 14 due to HEPo April 11 due to HEPo April 12 due to HEPo May 17 due to HEPo May 21 due to HELCO CT-4o August 11 due to HEPo October 10 due to HEP
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PUC Annual ReportâFiscal Year 2004-05 - Public Utilities Commission