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SAIDI
Reliability index used by electric power utilities
Reliability index used by electric power utilities
The system average interruption duration index (SAIDI){{cite web |url-status = dead
: \mbox{SAIDI} = \frac{\sum{U_i N_i}}{N_T}
where N_i is the number of customers and U_i is the annual outage time for location i, and N_T is the total number of customers served. In other words,
:\mbox{SAIDI} = \frac{\mbox{sum of all customer interruption durations}}{\mbox{total number of customers served}}
SAIDI is measured in units of time, often minutes or hours; it is usually measured over the course of a year. According to IEEE Standard 1366–1998, the median value for North American utilities is approximately 1.50 hours. According to the U.S. Energy Information Administration annual electric power industry report, it is 2.0 hours, rising to the range of 3.5 to 8 hours, when "major events" are included.
Comparison of SAIDI by country
The following is a table of SAIDI for different countries, calculated using the methodology in the World Bank's Doing Business 2016-2020 studies:
| Country | Population | SAIDI | SAIDI |
|---|---|---|---|
| Austria | 8.9 | 0.7 | 0.6 |
| Belgium | 11.5 | 0.7 | 0.4 |
| Croatia | 4.0 | 4.8 | 3.3 |
| Cyprus | 1.2 | 0.3 | 0.6 |
| Czechia | 10.7 | 0.5 | 0.5 |
| Denmark | 5.8 | 0.5 | 0.5 |
| Estonia | 1.3 | 0.3 | 0.3 |
| Finland | 5.5 | 0.6 | 0.2 |
| France | 67.6 | 0.2 | 0.4 |
| Germany | 83.2 | 0.2 | 0.3 |
| Greece | 10.7 | 1.9 | 1.6 |
| Hungary | 9.8 | 2.8 | 2.6 |
| Ireland | 5.0 | 0.3 | 0.8 |
| Italy | 59.4 | 0.5 | 1.3 |
| Latvia | 1.9 | 1.0 | 1.0 |
| Lithuania | 2.8 | 0.4 | 0.4 |
| Luxembourg | 0.6 | 0.4 | 0.4 |
| Malta | 0.5 | 0.6 | 0.8 |
| Netherlands | 17.4 | 0.8 | 0.8 |
| Norway | 5.4 | 0.7 | 1.5 |
| Poland | 37.9 | 1.3 | 1.1 |
| Portugal | 10.3 | 0.6 | 0.5 |
| Romania | 19.3 | 2.1 | 3.1 |
| Slovakia | 5.5 | 1.0 | 0.9 |
| Slovenia | 2.1 | 0.6 | 0.1 |
| Spain | 47.4 | 0.5 | 0.5 |
| Sweden | 10.4 | 0.6 | 0.6 |
| Switzerland | 8.6 | 0.2 | 0.2 |
| United Kingdom | 67.1 | 0.3 | 0.3 |
| United States | 331.5 | 1.2 | 1.3 |
References
References
- "[https://www.eia.gov/todayinenergy/detail.php?id=54639 U.S. electricity customers averaged seven hours of power interruptions in 2021]", (published November 14, 2022), Average duration of total annual electric power interruptions, United States (2013-2021) hours per customer.
- The World Bank, Data Bank "World Development Indicators", total population 2020, https://databank.worldbank.org/reports.aspx?source=2&series=SP.POP.TOTL&country=
- The World Bank, Data Bank "Doing Business", SAIDI index WB 2019, https://databank.worldbank.org/SAIDI-Index-WB/id/dd1d6036
- The World Bank, Data Bank "Doing Business", SAIDI index WB 2020, https://databank.worldbank.org/SAIDI-Index-WB/id/dd1d6036
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