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System Average Interruption Frequency Index (SAIFI)
European Union Electricity Market Glossary



According to the CEER Benchmarking Report 6.1 or 26 July 2018 on the Continuity of Electricity and Gas Supply (data update 2015/2016, Ref: C18-EQS-86-03, p. 7, 8, 10)  the 2016 values of unplanned SAIFI for electricity, including exceptional events, were between 0,08 and 4,35 interruptions per customer while unplanned SAIFI excluding exceptional events ranged from 0,05 and 3,83 interruptions per customer.


The said Report notes, however, that the comparison of SAIFI is complicated by the fact that voltage levels are taken into account in different ways across reporting countries, in particular:

- in the Czech Republic, all values correspond only to TSO and/or 3 largest DSOs which represent the vast majority of the territory of the country;

- in Denmark, the definition of LV, MV, HV and EHV differ between the SAIFI values and the reported length of circuits at different voltage intervals (when considering SAIFI values, the following definitions apply: LV = 0,4 kV, MV = 1–24 kV, HV = 25–99 kV, EHV = none; when considering circuit length: LV = 0,4 kV, MV = 0,4–10 kV, HV = 10–50 kV, EHV = 50–132 kV);

- Bulgaria, Croatia, Germany, Greece and Latvia only include low and medium voltage in their SAIFI values;

- Finland only includes medium voltage in their unplanned SAIFI;

- as of 2016, France does not include medium and low voltage in their unplanned SAIFI;

- Ireland, Romania and Sweden do not include extra high voltage in their data;

- in Malta, planned and unplanned SAIFI (including exceptional events) values show interruptions at 11 kV or above;

- in the Netherlands, the data provided for SAIFI take into account all interruptions longer than 5 seconds;

- in Norway, low voltage interruptions have only been registered since 2014;

- in Portugal, overall SAIFI only include low voltage;

- in Slovenia, unplanned SAIFI without exceptional events only include interruptions on EHV and HV levels (indicators such as planned/unplanned SAIFI including all interruptions only refer to medium voltage).


As regards the SAIFI for gas the aforementioned CEER Report states that the values of planned SAIFI (between 0,0023 – 0,196) were greater than the values of unplanned SAIFI (0,0021 – 0,02 interruptions per customer).


The said CEER Report also observes that the continuity of supply indicators for gas are monitored in significantly less European countries than for electricity.






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CEER Benchmarking Report 6.1 on the Continuity of Electricity and Gas Supply (Data update 2015/2016, Ref: C18-EQS-86-03), 26 July 2018











System Average Interruption Duration Index (SAIDI)






Last Updated on Tuesday, 26 March 2019 13:16


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