SAIDI

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The System Average Interruption Duration Index (SAIDI)[1] is commonly used as a reliability index by electric power utilities. SAIDI is the average outage duration for each customer served, and is calculated as:

where is the number of customers and is the annual outage time for location , and is the total number of customers served. In other words,

SAIDI is measured in units of time, often minutes or hours. It is usually measured over the course of a year, and according to IEEE Standard 1366-1998 the median value for North American utilities is approximately 1.50 hours.

Comparison of SAIDI by country[edit]

The following is a table of SAIDI for different countries; the share of renewable energy (gross electricity consumption) is also given:[2]

Country Population

(million)

SAIDI

(minutes)

Renewable energy

share (%)

Year

(2013 if not named)

Luxembourg 0.5 10 5.8
Denmark 5.6 11.25 43.1
Germany 83.2 12.2 49.3 2020[3][4]
Switzerland 8.1 15 19
Netherlands 16.8 23 10
Austria 8.5 33.96 68
Belgium 11.2 34.75 12.4
Italy 59.8 42.27 31.3
Great Britain 64.1 54.71 13.8
Spain 46.6 58.2 36.7 2011
Slovenia* 2.1 60 33.1
Hungary 9.9 67.21 6.6
France 63.9 68.1 16.8
Sweden 9.6 70.77 61.8
Lithuania 3 72.67 13.1
Ireland 4.6 82 20.8 2010
Portugal 10.5 88.7 49.1
Greece 11.1 96 21.2
Czechia 10.5 98.01 12.8
Slovakia 5.4 110.9 20.8
Finland** 5.4 138 30.9
Norway* 5.1 144 37.4
Cyprus 1.1 148 6.6 2012
Croatia 4.3 176.1 42.2
Poland 38.5 254.9 10.7
USA 328 280 23 2019[5][6]
Malta* 0.4 360 1.6
Estonia 1.3 378.5 13
Latvia 2 621 48.8
Romania 21.3 635 37.5 2009

*, ** = Alternative SAIDI (e.g. T-SAIDI)

References[edit]

  1. ^ Yeddanapudi, Sree. "Distribution System Reliability Evaluation". Iowa State University. Archived from the original on 26 December 2011. Retrieved 18 June 2011.
  2. ^ "Was ist der SAIDI?". Retrieved 2017-02-22.
  3. ^ tagesschau.de. "Bundesrechnungshof kritisiert Altmaiers Energiepolitik" (in German).
  4. ^ "Bundesnetzagentur - Presse - Bundesnetzagentur veröffentlicht Daten zum Strommarkt 2020".
  5. ^ "U.S. power customers experienced an average of nearly five hours of interruptions in 2019 - Today in Energy - U.S. Energy Information Administration (EIA)".
  6. ^ NATURSTROM AG. "Erneuerbare Energien: Die Energiewende der USA lahmt" (in German).