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Supply Quality


Energy supply grid operators are legally bound to submit a report of all supply interruptions in the last calendar year to the Federal Grid Agency (BNetzA). The report includes date, duration, extent and cause of each supply interruption lasting longer than three minutes. For the reporting year 2017, 862 grid operators reported 166 500 supply interruptions for 869 grids for the calculation of the average grid downtime (System Average Interruption Duration Index (SAIDI)) for ultimate consumers. The slight increase in SAIDI (see line in figure) in 2017 is due to the increase of 2,25 min in medium voltage. Low voltage also recorded a slight increase in the interruption period of 0.12 min. The number of supply interruptions increased due to the increased number of feedback disturbances. This is a disturbance in caused by various weather conditions such as thunderstorms, ice or similar. Compared to the previous year, the number of disturbances due to atmospheric impacts has increased [Bundesnetzagentur and Bundeskartellamt].


The supply quality in 2017 thus remains at the constant high level of the previous years. Looking at the year 2016, with a SAIDI of 1,67 minutes, Slovenia has the most secure power grid, followed by Switzerland with a SAIDI of 9 minutes. When it comes to the SAIDI ranking of 2016 in Europe, Germany is at the third place [CEER]. There is currently no recognisably significant negative impact of the energy transition and the accompanying increasingly decentralised generation capacity on the supply quality [Bundesnetzagentur and Bundeskartellamt].






Development of the System Average Interruption Duration Index (SAIDI) value in the low and medium voltage levels from 2006 to 2017

Data source: [Bundesnetzagentur and Bundeskartellamt]