SAIDI
{{Short description|Reliability index used by electric power utilities}}
The system average interruption duration index (SAIDI){{cite web
|url = http://www.ee.iastate.edu/~jdm/ee653/DistributionReliabilityPredictive.ppt
|title = Distribution System Reliability Evaluation
|first = Sree
|last = Yeddanapudi
|publisher = Iowa State University
|accessdate = 18 June 2011
|url-status = dead
|archiveurl = https://web.archive.org/web/20111226034249/http://www.ee.iastate.edu/~jdm/ee653/DistributionReliabilityPredictive.ppt
|archivedate = 26 December 2011
}} is commonly used as a reliability index by electric power utilities. SAIDI is the average cumulative outage duration for each customer served, and is calculated as:
:
\mbox{SAIDI} = \frac{\sum{U_i N_i}}{N_T}
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. 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."[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.
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:
| class="wikitable sortable"
!Country !Population !SAIDI (hours) in 2019The World Bank, Data Bank "Doing Business", SAIDI index WB 2019, https://databank.worldbank.org/SAIDI-Index-WB/id/dd1d6036 !SAIDI (hours) in 2020The World Bank, Data Bank "Doing Business", SAIDI index WB 2020, https://databank.worldbank.org/SAIDI-Index-WB/id/dd1d6036 |
| Austria
| style="text-align:right" |8.9 | style="text-align:right" |0.7 | style="text-align:right" |0.6 |
| Belgium
| style="text-align:right" |11.5 | style="text-align:right" |0.7 | style="text-align:right" |0.4 |
| Croatia
| style="text-align:right" |4.0 | style="text-align:right" |4.8 | style="text-align:right" |3.3 |
| Cyprus
| style="text-align:right" |1.2 | style="text-align:right" |0.3 | style="text-align:right" |0.6 |
| Czechia
| style="text-align:right" |10.7 | style="text-align:right" |0.5 | style="text-align:right" |0.5 |
| Denmark
| style="text-align:right" |5.8 | style="text-align:right" |0.5 | style="text-align:right" |0.5 |
| Estonia
| style="text-align:right" |1.3 | style="text-align:right" |0.3 | style="text-align:right" |0.3 |
| Finland
| style="text-align:right" |5.5 | style="text-align:right" |0.6 | style="text-align:right" |0.2 |
| France
| style="text-align:right" |67.6 | style="text-align:right" |0.2 | style="text-align:right" |0.4 |
| Germany
| style="text-align:right" |83.2 | style="text-align:right" |0.2 | style="text-align:right" |0.3 |
| Greece
| style="text-align:right" |10.7 | style="text-align:right" |1.9 | style="text-align:right" |1.6 |
| Hungary
| style="text-align:right" |9.8 | style="text-align:right" |2.8 | style="text-align:right" |2.6 |
| Ireland
| style="text-align:right" |5.0 | style="text-align:right" |0.3 | style="text-align:right" |0.8 |
| Italy
| style="text-align:right" |59.4 | style="text-align:right" |0.5 | style="text-align:right" |1.3 |
| Latvia
| style="text-align:right" |1.9 | style="text-align:right" |1.0 | style="text-align:right" |1.0 |
| Lithuania
| style="text-align:right" |2.8 | style="text-align:right" |0.4 | style="text-align:right" |0.4 |
| Luxembourg
| style="text-align:right" |0.6 | style="text-align:right" |0.4 | style="text-align:right" |0.4 |
| Malta
| style="text-align:right" |0.5 | style="text-align:right" |0.6 | style="text-align:right" |0.8 |
| Netherlands
| style="text-align:right" |17.4 | style="text-align:right" |0.8 | style="text-align:right" |0.8 |
| Norway
| style="text-align:right" |5.4 | style="text-align:right" |0.7 | style="text-align:right" |1.5 |
| Poland
| style="text-align:right" |37.9 | style="text-align:right" |1.3 | style="text-align:right" |1.1 |
| Portugal
| style="text-align:right" |10.3 | style="text-align:right" |0.6 | style="text-align:right" |0.5 |
| Romania
| style="text-align:right" |19.3 | style="text-align:right" |2.1 | style="text-align:right" |3.1 |
| Slovakia
| style="text-align:right" |5.5 | style="text-align:right" |1.0 | style="text-align:right" |0.9 |
| Slovenia
| style="text-align:right" |2.1 | style="text-align:right" |0.6 | style="text-align:right" |0.1 |
| Spain
| style="text-align:right" |47.4 | style="text-align:right" |0.5 | style="text-align:right" |0.5 |
| Sweden
| style="text-align:right" |10.4 | style="text-align:right" |0.6 | style="text-align:right" |0.6 |
| Switzerland
| style="text-align:right" |8.6 | style="text-align:right" |0.2 | style="text-align:right" |0.2 |
| United Kingdom
| style="text-align:right" |67.1 | style="text-align:right" |0.3 | style="text-align:right" |0.3 |
| United States
| style="text-align:right" |331.5 | style="text-align:right" |1.2 | style="text-align:right" |1.3 |
References
{{Reflist}}
External links
- [https://www.youtube.com/watch?v=oVH9L0fCMTU EIA Reliability Metrics video] by the U.S. Energy Information Administration on YouTube
{{Reliability indices}}