• Source: SAIFI

The System Average Interruption Frequency Index (SAIFI) is commonly used as a reliability index by electric power utilities. SAIFI is the average number of interruptions that a customer would experience, and is calculated as






SAIFI


=



∑


λ

i



N

i





∑


N

i








{\displaystyle {\mbox{SAIFI}}={\frac {\sum {\lambda _{i}N_{i}}}{\sum {N_{i}}}}}


where




λ

i




{\displaystyle \lambda _{i}}

is the failure rate and




N

i




{\displaystyle N_{i}}

is the number of customers for location



i


{\displaystyle i}

. In other words,






SAIFI


=



total number of customer interruptions


total number of customers served





{\displaystyle {\mbox{SAIFI}}={\frac {\mbox{total number of customer interruptions}}{\mbox{total number of customers served}}}}


SAIFI is measured in units of interruptions per customer. 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 1.10 interruptions per customer.




Sources


Layton, Lee (2004). "Electric System Reliability Indices" (PDF). www.egr.unlv.edu.

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