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System Average Interruption Duration Index (SAIDI)
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) for electricity in 2016, unplanned SAIDI including exceptional events had a range between 9 and 371 minutes per customer while unplanned SAIDI without exceptional events was between 9 and 290 minutes per customer.


The former indicator includes all interruptions regardless of their cause and is possibly more reliable for benchmarking because of significant differences in definitions of exceptional events across Europe.


The said CEER Report observes that the comparison of SAIDI 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 SAIDI values and the reported length of circuits at different voltage intervals (when considering SAIDI 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 SAIDI values;

- Finland only includes medium voltage in their unplanned SAIDI;


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

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

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

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

- in Poland, low voltage is not included in SAIDI;

- in Portugal, overall SAIDI only include low voltage;

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


Unplanned SAIDI for gas ranged in 2016 from 0,008 to 6,043 minutes per customer (with the country with the highest value including major incidents in their interruption indicator).


In all other countries, unplanned SAIDI for gas was significantly below 2.


Planned SAIDI values for gas were in 2016 between 0,026 and 23,389 minutes per customer.


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


Moreover, SAIDI values are generally much lower in gas than in electricity.


This is due to underground gas pipelines which are not exposed to forces of nature in the same way as overhead power cables.







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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 Frequency Index (SAIFI)








Last Updated on Friday, 24 August 2018 19:35


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