Reliability Report -- 1999 - Pennsylvania Public Utility Commission

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PPL’s SAIFI increased from 0.89 in 2009 to 1.09 in 2010, which was a 22.5 percent increase in outage frequency and 7.9 percent better than the standard of 1.18. SAIFI had remained below the benchmark from June 2009 through June 2010, but is trending upward, attributable, in part, to storms that are not excludable. The SAIFI three-year average was 1.01, or 6.6 percent below the standard of 1.08. For the 12-month average ending March 31, 2011, SAIFI was 1.16, or 1.5 percent below the standard. Figure 32 depicts the trend in the frequency of service interruptions for the PPL system from March 2004 through March 2011, compared to the established benchmark and standard for SAIFI. In 2010, equipment failure represented 27.8 percent of the interruptions, 32.1 percent of customers affected and 27.4 percent of interruptions minutes. PPL reported that a large portion of interruptions attributed to equipment failure were weather-related and are not considered to be indicators of equipment condition or performance. Non-trimming tree-related outages, generally caused by trees falling from outside of PPL’s rights-of-way, were the second-largest cause of customer outages representing 27.0 percent of incidents, 33.8 percent of customers affected and 48.4 percent of interruption minutes. Animal-related outages accounted for 23.6 percent of incidents, 5.3 percent of customers affected and 4.6 percent of interruption minutes. Figure 33 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 34. Figure 31 PPL Customer Average Interruption Duration Index (minutes) 180 170 160 150 140 130 12-month CAIDI Benchmark 12-month Standard 120 110 Electric Service Reliability in Pennsylvania 2010 33
Figure 32 PPL System Average Interruption Frequency Index (interruptions per customer) 1.30 1.25 1.20 12-month SAIFI Benchmark 12-month Standard 1.15 1.10 1.05 1.00 0.95 0.90 0.85 Figure 33 PPL outage causes (percent of total outages) Other - Non- Controllable Nothing Found Customer Minutes Interrupted Customers Affected Number of Incidents Equipment Failures Vehicles Animals Trees - Not Trimming Related Trees - Trimming Related 0 5 10 15 20 25 30 35 40 45 50 34 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: Figure 30 Pike County outage tracki
Page 43 and 44: In 2010, equipment failure was attr
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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