Third Benchmarking Report on Quality of Electricity Supply

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FIG 1.7 UNPLANNED INTERRUPTIONS Short interruptions per customer per year (1999 – 2004)7Short interruptions per customer654321Finland HV, MV, LVFrance LVGreat Britain HV, MV, LVItaly HV, MV, LV01999 2000 2001 2002 2003 2004Year1.7.8 Electricity Not Supplied (ENS)The level of electricity not supplied gives an indication of the overall robustness of a country’selectricity networks. For most countries the information relates to transmission networks only,although there are some countries such as Italy, where the ENS and AIT information includes datafrom interruptions at distribution high voltage. Given that all other things being equal, a larger systemwould tend to record more energy not supplied than a smaller system, the information onENS is presented as energy not supplied as a percentage of the total energy supplied by that systemin a given year.FIG 1.8 ENS AS A PERCENTAGE OF DISTRIBUTED ENERGY (1999 – 2004)0.010%Percentage of energy not distributed0.009%0.008%0.007%0.006%0.005%0.004%0.003%0.002%0.001%01999 2000 2001 2002 2003 2004YearFinlandFranceGreat BritainHungaryItalyNorwayPortugalSpainSweden25<strong>Third</strong> <strong>Benchmarking</strong> <strong>Report</strong> on Quality of Electricity Supply – 2005 · Chapter 1
1.7.9 AIT (Transmission)Transmission networks are generally designed to higher standards than distribution networks andas a result faults taking customers off supply are relatively infrequent. However, when there areinterruptions on the transmission they tend to result in large numbers of customers being off supplyand high values for energy not supplied. Figs 1.6 and 1.7 illustrate this clearly, with most countriesshowing average AIT below 10 minutes lost per year but a number of countries experiencingpeaks two, three or even five times this level. Such peaks often make headline news internationallyas well as nationally, as was the case in the transmission outages in London and Birminghamin Great Britain in 2003, the blackouts and load shedding in Italy in 2003 and the transmission outagein southern Sweden in 2003. The peaks in AIT are generally mirrored by those in ENS,although the percentage change generated in Portugal for AIT in 2000 was higher than that forENS, whilst in Spain the percentage ENS in 2001 was greater than the percentage change in AIT.FIG 1.9 AIT (1999 – 2004)AIT – Minutes lost per year – Transmission network – all interruptions50Minutes lost per customer4540353025201510501999 2000 2001 2002 2003 2004YearBelgium_natFinlandFranceGreat BritainHungaryItalyPortugalSpainSweden1.8 Further analysis of interruptions set out in the Annex to this chapterA range of additional analysis has been carried out studying the relationship between the numberand duration of interruptions and network and customer characteristics. The additional analysis isset out in the Annex to this chapter. The key findings are set out below:··Excluding exceptional events from short interruptions data is not a common practice acrossEurope;As would be expected there is a strong positive correlation between the number of interruptionsand the duration of interruptions;26Council of European Energy Regulators – Ref: C05-QOS-01-03
Page 1: Council ofEuropeanEnergyRegulatorsT
Page 4: Council ofEuropeanEnergyRegulatorsE
Page 10: CHAPTER 1 - Continuity of SupplyCON
Page 13 and 14: ··utes are defined as “short in
Page 15 and 16: interruptions is very small. AIT is
Page 17 and 18: Interruptions shorter than three mi
Page 19 and 20: 1.6.1 Weighting methods used for co
Page 21 and 22: ADDITIONAL INFORMATION 1.3 - NOTICE
Page 23 and 24: and in Italy the integration of the
Page 25 and 26: 1.6.3 Rules for recording short int
Page 27 and 28: ADDITIONAL INFORMATION 1.8 - AUDITS
Page 29: SAIDI1.7.1 Unplanned SAIDI not attr
Page 36: ···There is some evidence to sup
Page 40 and 41: THE USE OF STANDARDS AND INCENTIVES
Page 42 and 43: 2.2.1 Continuity measurement system
Page 44 and 45: Almost all countries having adopted
Page 46 and 47: 2.2.3 Findings I: Quality measureme
Page 48 and 49: The incentive is symmetric and rela
Page 50 and 51: In Sweden, a quality of supply inde
Page 52 and 53: Regulators’ concern with the vola
Page 54 and 55: In Great Britain the regulator (Ofg
Page 56 and 57: ··A regime to avoid overquality i
Page 58 and 59: ··gets”; introduction of an upp
Page 60 and 61: FIG 2.4/b CONVERGENCE EFFECT OF THE
Page 62 and 63: 2.4 Continuity standards at single-
Page 64 and 65: Observation suggests that there is
Page 66 and 67: 2.4.2 Multiple interruption standar
Page 68 and 69: 2.4.3 Single-customer standards rel
Page 70 and 71: E SIStandard for long interruptions
Page 72: introduce single-customer standards
Page 76 and 77: STANDARDS IN COMMERCIAL QUALITY REG
Page 78 and 79: Commercial quality regulation attem
Page 80 and 81: The evaluation of the actual level
Page 82 and 83: TABLE 3.5MOST FREQUENTLY USED COMME
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the standards relating to a particu
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Quest.2.1.19Supp.1Recomm.✰✰✰
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3.3.3 Problems associated with volt
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the compensation paid by the electr
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Quest.2.1.23Supp.0Recomm.✰✰✰D
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answered (for instance Portugal and
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countries who supplied data have a
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metering problems, customer’s que
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step. CEER recommends that member s
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CHAPTER 4 - Voltage Quality Monitor
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For the rest of the voltage quality
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·In Czech Republic a monitoring sy
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tion point of single customers: in
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ADDITIONAL INFORMATION 4.2 - POWER
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ator must advise clients connected
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ADDITIONAL INFORMATION 4.3 - CUSTOM
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mandatory such values are applicabl
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ANNEXES - ANNEX TO CHAPTER 1.Sectio
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Appendix - BELGIUM - Wallonia1. Acc
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(CONTINUE) SECTION 2 - PLANNED INTE
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TABLE 3.4 - UNPLANNED INTERRUPTIONS
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TABLE 3.10 - ENERGY NOT SUPPLIED AS
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TABLE 4.2 - VOLTAGE LEVEL ANALYSIS
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The classification of continuity da
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The same pattern emerges with the i
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ANNEX TO CHAPTER 2.Annex 2.1 - Comp
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Quest.2.1.18Supp.0Recomm.✰✰DSO5
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Quest.1.1.9Supp.0Recomm.✰✰✰DS
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3.3.10.4 HungarySupply level in the
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TABLE 3.2INDICATORS1.1.1. Average w
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TABLE 3.3.AINDICATORS2.1.1. Respond
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TABLE 3.3.BINDICATORS2.1.1.Respondi
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TABLE 3.4INDICATORSAustriaBg Flande
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TABLE 3.6 ESTIMATING CHARGES (WORKI
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TABLE 3.10 CONNECTING (SUPPLY AND M
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TABLE 3.14 AVERAGE TIME TO PROVIDE
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TABLE 3.18 METER PROBLEMS (WORKING
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TABLE 3.22 RESPONSE TO CUSTOMER LET
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TABLE 3.27 AVERAGE WAITING TIME IN
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TABLE 3.32 NUMBER OF COMPLAINTS PER
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TABLE 3.38PREPAYMENT METER FAULT (W
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TABLE 3.43NUMBER OF REVISED BILLS P
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ANNEX TO CHAPTER 4.ANNEX 4.1 Voltag
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TABLE 2: NORWAY: Flicker severity l
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TABLE 5: PORTUGAL: for EHV and HV,
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Third Benchmarking Report on Quality of Electricity Supply

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