Third Benchmarking Report on Quality of Electricity Supply

1.7 AnalysisThe number of countries providing information for the different measures varied from 15 to 4depending on the measure in question. In order to provide for meaningful comparisons a rule ofthumb was used whereby countries providing 2 or fewer years’ worth of data were not included inthe analysis in this chapter but are instead shown in the Annex to this chapter.Care must be taken when comparing countries’ figures not only because there are a number ofmethods employed for calculating the continuity indicators, but also because of differences in thescope of interruptions covered, the rules determining how interruptions are counted and therobustness of the data itself. The legends in the charts in this section attempt to spell out the voltagelevels captured and the information in Table 1.3 sets out the different weighting methodsemployed by the respective countries.Even where countries employ the same weighting method and their interruptions data covers thesame voltage levels, differences can still occur. For instance, the Netherlands make no distinctionbetween planned and unplanned interruptions, therefore when comparing their figures in charts1.2 and 1.5 the reader should take this into account. In Ireland long interruptions are all interruptionsgreater than 1 minute, whereas most other countries have adopted the standard practice ofclassifying long interruptions as those being 3 minutes or longer.The remainder of this chapter is set out as follows:SAIDIUnplanned not attributable to exceptional eventsUnplannedPlannedSAIFIUnplanned not attributable to exceptional eventsUnplannedPlannedMAIFIEnergy Not SuppliedAverage Interruption TimeParagraph1.7.11.7.21.7.31.7.41.7.51.7.61.7.71.7.81.7.9Table(s) in Annex3.13.23.33.43.53.63.73.8, 3.9, 3.103.1119<strong>Third</strong> <strong>Benchmarking</strong> <strong>Report</strong> on Quality of Electricity Supply – 2005 · Chapter 1