SAIDI
The System Average Interruption Duration Index (SAIDI)[1] is commonly used as a reliability indicator by electric power utilities. SAIDI is the average outage duration for each customer served, and is calculated as:
[math]\displaystyle{ \mbox{SAIDI} = \frac{\sum{U_i N_i}}{N_T} }[/math]
where [math]\displaystyle{ N_i }[/math] is the number of customers and [math]\displaystyle{ U_i }[/math] is the annual outage time for location [math]\displaystyle{ i }[/math], and [math]\displaystyle{ N_T }[/math] is the total number of customers served. In other words,
[math]\displaystyle{ \mbox{SAIDI} = \frac{\mbox{sum of all customer interruption durations}}{\mbox{total number of customers served}} }[/math]
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
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) |
|---|---|---|---|---|
| USA | 328 | 280 | 23 | 2019[3][4] |
| Luxembourg | 0.5 | 10 | 5.8 | |
| Denmark | 5.6 | 11.25 | 43.1 | |
| Switzerland | 8.1 | 15 | 19 | |
| Germany | 83.2 | 12.2 | 49.3 | 2020[5][6] |
| Netherlands | 16.8 | 23 | 10 | |
| Austria | 8.5 | 33.96 | 68 | |
| Belgium | 11.2 | 34.75 with major e. | 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 | |
| France | 63.9 | 68.1 | 16.8 | |
| Hungary | 9.9 | 67.21 | 6.6 | |
| 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 with major e. | 30.9 | |
| Norway* | 5.1 | 144 with major e. | 37.4 | |
| Cyprus | 1.1 | 148 | 6.6 | 2012 |
| Croatia | 4.3 | 176.1 | 42.2 | |
| Poland | 38.5 | 254.9 | 10.7 | |
| Malta* | 0.4 | 360 | 1.6 | |
| Estonia | 1.3 | 378.5 with major e. | 13 | |
| Latvia | 2 | 621 | 48.8 | |
| Romania | 21.3 | 635 | 37.5 | 2009 |
*, ** = Alternative SAIDI (e.g. T-SAIDI)
See also
References
- ↑ Yeddanapudi, Sree. "Distribution System Reliability Evaluation". Iowa State University. Archived from the original on 26 December 2011. https://web.archive.org/web/20111226034249/http://www.ee.iastate.edu/~jdm/ee653/DistributionReliabilityPredictive.ppt. Retrieved 18 June 2011.
- ↑ "Was ist der SAIDI?". https://www.next-kraftwerke.de/wissen/strommarkt/saidi-index.
- ↑ "U.S. power customers experienced an average of nearly five hours of interruptions in 2019 - Today in Energy - U.S. Energy Information Administration (EIA)". https://www.eia.gov/todayinenergy/detail.php?id=45796.
- ↑ NATURSTROM AG. "Erneuerbare Energien: Die Energiewende der USA lahmt" (in de). https://www.energiezukunft.eu/wirtschaft/die-us-amerikanische-energiewende-lahmt/.
- ↑ tagesschau.de. "Bundesrechnungshof kritisiert Altmaiers Energiepolitik" (in de). https://www.tagesschau.de/wirtschaft/technologie/energie-altmaier-bundesrechnungshof-101.html.
- ↑ "Bundesnetzagentur - Presse - Bundesnetzagentur veröffentlicht Daten zum Strommarkt 2020". https://www.bundesnetzagentur.de/SharedDocs/Pressemitteilungen/DE/2021/20210102_smard.html.
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