Reliability Report -- 1999 - Pennsylvania Public Utility Commission

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Figure 34 PPL outage tracking (number of incidents) 7,000 6,500 6,000 5,500 5,000 4,500 4,000 3,500 3,000 Animals Equipment Failures Trees - Not Trimming Related 2,500 2,000 UGI Utilities Inc. In 2010, UGI’s customers experienced 30,022 service interruptions with a total duration of 2,963,057 minutes, which was 40.5 percent lower than last year. No major events occurred in UGI’s service territory in 2010. UGI’s CAIDI declined from 105 minutes in 2009 to 99 minutes in 2010, which was a 5.7 percent decrease in CAIDI minutes and 41.4 percent better than the benchmark of 169 minutes. CAIDI has remained below the benchmark ever since the Commission began monitoring reliability performance. A declining CAIDI has been the general trend since December 2008. The CAIDI three-year average of 113 minutes was 39.2 percent better than the standard of 186 minutes. For the 12-month average ending March 31, 2011, CAIDI was 114 minutes, or 32.5 percent below the benchmark. SAIDI dropped from 80 minutes in 2009 to 48 minutes in 2010. Figure 35 depicts the trend in the duration of customer interruptions for the UGI system from March 2004 through March 2011, compared to the established benchmark and standard for CAIDI. UGI’s SAIFI decreased from 0.76 in 2009 to 0.48 in 2010, which was a 36.8 percent decline in outage frequency and 42.2 percent better than the benchmark. Except for two quarters in 2009, SAIFI has remained under the benchmark for several years. The SAIFI three-year average was 30.0 percent below the standard of 0.91. For the 12-month average ending March 31, 2011, SAIFI was 0.49 or 41.0 percent better than the benchmark. Figure 36 depicts the trend in the frequency of service interruptions for the UGI system from March 2004 through March 2011, compared to the established benchmark and standard for SAIFI. Electric Service Reliability in Pennsylvania 2010 35
In 2010, equipment failure was attributed to 28.5 percent of the incidents, 29.0 percent of customers affected and 27.9 percent of interruption minutes. Tree-related outages represented 23.9 percent of incidents, 28.0 percent of customers affected and 33.9 percent of interruption minutes. Animals were responsible for 22.5 percent of the outages, 7.9 percent of customers affected and 6.3 percent of interruption minutes. Figure 37 shows the distribution of causes of service outages occurring during 2010 as a percentage of total outages. The trend in the number of outages by the top three major causes is shown in Figure 38. A portion of the equipment failures have been attributed to a problem with the A.B. Chance fuse cutouts utilized on the UGI system. UGI has completed its program to replace these defective fuse cutouts, since they have experienced an above-average failure rate and had been the noted source of an increase in outages caused by equipment failure on UGI’s system. Figure 35 UGI Customer Average Interruption Duration Index (minutes) 240 230 220 210 200 12-month CAIDI Benchmark 12-month Standard 190 180 170 160 150 140 130 120 110 100 90 36 Pennsylvania Public Utility Commission
Page 1 and 2: ElectricService Reliabilityin Penns
Page 4 and 5: Executive Summary The Electricity G
Page 6: Table of Contents Section 1 - Intro
Page 9 and 10: and procedures in place to adequate
Page 11 and 12: trees. This analysis is helpful in
Page 13 and 14: Pennsylvania Code, effective Sep. 2
Page 15 and 16: Section 3 - Statistical Utility Per
Page 17 and 18: Utility-Specific Performance Data T
Page 19 and 20: Figure 3 Citizens’ Customer Avera
Page 21 and 22: Duquesne Light Company In 2010, Duq
Page 23 and 24: Figure 9 Duquesne outage causes (pe
Page 25 and 26: Figure 11 Met-Ed Customer Average I
Page 27 and 28: PECO Energy Company In 2010, PECO
Page 29 and 30: Figure 17 PECO outage causes (perce
Page 31 and 32: Figure 19 Penelec Customer Average
Page 33 and 34: Pennsylvania Power Company In 2010,
Page 35 and 36: Figure 25 Penn Power outage causes
Page 37 and 38: In 2010, the major cause of service
Page 39 and 40: Figure 30 Pike County outage tracki
Page 41: Figure 32 PPL System Average Interr
Page 45 and 46: Figure 38 UGI outage tracking (numb
Page 47 and 48: Figure 39 Wellsboro Customer Averag
Page 49 and 50: West Penn Power Company In 2010, We
Page 51 and 52: Figure 45 West Penn outage causes (
Page 53 and 54: Appendix A - Electric Reliability I
Page 55 and 56: Appendix B - Modifications to Inspe
Page 57 and 58: Modifications to Inspection and Mai

Reliability Report -- 1999 - Pennsylvania Public Utility Commission

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