Reliability Report -- 1999 - Pennsylvania Public Utility Commission

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Allegheny Power System System Average Interruption Frequency Index (SAIFI) 1.4 Rolling 12-Month Standard 1.2 1.0 Benchmark Frequency 0.8 0.6 0.4 0.2 0.0 Mar-05 Jun-05 Sep-05 Dec-05 Mar-06 12 Months Ending The graph below shows the distribution of causes of service outages occurring during 2005 as a percentage of total outages. Equipment failure was responsible for 29.9% of the outages, 27.9% of customers affected and 20.4% of customer minutes interrupted. Trees off the right-of-way were the second leading cause of service interruptions, with 23.6% of the outages, 23.8% of customers affected and 36.7% of interruption minutes. Electric Service Reliability in Pennsylvania 11
Allegheny Power System 2005 Outage Causes Weather Unknown Customer Minutes Interrupted Customers Affected Number of Incidents Trees off ROW Trees on ROW Public/Customer Other Equipment Failure Animals 0% 5% 10% 15% 20% 25% 30% 35% 40% Percent of Outages Duquesne Light Company Duquesne’s overall performance continues to be better than the reliability standard. In fact, Duquesne’s 2005 CAIDI of 98 minutes was 10 minutes better than the benchmark of 108 minutes. The 2005 SAIFI was an average of 0.98 outages per customer, compared to a benchmark of 1.17 outages. 21 Duquesne states that its effective outage restoration process and significant distribution automation allows it to restore power quickly to large numbers of customers. Duquesne reported no major events for 2005. For the 2005 calendar year, Duquesne filed three outage reports pursuant to 52 Pa. Code § 67.1. 21 Duquesne’s system does not provide an actual count of customers interrupted. The data available is in regard to interrupted load. The unit used is KVA, or kilovoltampere, which is the basic unit of apparent power. 12 Pennsylvania Public Utility Commission
Page 1 and 2: ElectricService Reliabilityin Penns
Page 3 and 4: EXECUTIVE SUMMARY The Electricity G
Page 5 and 6: TABLE OF CONTENTS SECTION 1 - INTRO
Page 7 and 8: Subsequently, on December 16, 1999,
Page 9 and 10: included is the data used in calcul
Page 11 and 12: the reliability performance of the
Page 13 and 14: Utility Specific Performance Data A
Page 15: As seen here, CAIDI improved from t
Page 19 and 20: Duquesne Light Company Customer Ave
Page 21 and 22: The graph below shows the distribut
Page 23 and 24: Metropolitan Edison Company Custome
Page 25 and 26: Metropolitan Edison Company System
Page 27 and 28: the SAIFI benchmark was increased f
Page 29 and 30: The rolling 12-month averages for t
Page 31 and 32: 14.0% of total incidents, 18.5% of
Page 33 and 34: Pennsylvania Power Company Customer
Page 35 and 36: Pennsylvania Power Company System A
Page 37 and 38: In 2005, PECO’s customers experie
Page 39 and 40: PECO Energy Company System Average
Page 41 and 42: PECO Energy Company 2005 Outage Cau
Page 43 and 44: PPL Electric Utilities Corporation
Page 45 and 46: PPL’s SAIFI was below the benchma
Page 47 and 48: UGI Utilities, Inc. Customer Averag
Page 49 and 50: UGI Utilities, Inc. System Average
Page 51 and 52: determine the type of each event ex
Page 53 and 54: Citizens' Electric Company System A
Page 55 and 56: Pike County Light & Power Company P
Page 57 and 58: Pike County Light & Power Company C
Page 59 and 60: For 2003 and 2004, SAIFI has been a
Page 61 and 62: November 28, 2005: severe weather e
Page 63 and 64: Wellsboro Electric Company System A
Page 65 and 66: SECTION 4 - INSPECTION AND MAINTENA
Page 67 and 68:
In addition to monitoring the relia
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Reliability Report -- 1999 - Pennsylvania Public Utility Commission

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