CAIFI

The Customer Average Interruption Frequency Index (CAIFI)[1] is a popular reliability index used in the reliability analysis of an electric power system.[2] It is designed to show trends in customers interrupted and helps to show the number of customers affected out of the whole customer base.

${\mbox{CAIFI}}={\frac {\mbox{Total Number of Customer Interruptions}}{\mbox{Number of Distinct Customers Interrupted}}}$

References

Yeddanapudi, Sree. "Distribution System Reliability Evaluation". Iowa State University. Archived from the original on 26 December 2011. Retrieved 18 June 2011.
Power Distribution Planning Reference Book, H. Lee Willis, published by CRC Press, 2004, page 112

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[1] Yeddanapudi, Sree. "Distribution System Reliability Evaluation". Iowa State University. Archived from the original on 26 December 2011. Retrieved 18 June 2011.

[2] Power Distribution Planning Reference Book, H. Lee Willis, published by CRC Press, 2004, page 112

Reliability indices
Generic	MTBF MTTR FOR EFOR
Electricity distribution	ASUI ASAI CAIDI/SAIDI CAIFI/SAIFI MAIFI CTAIDI
Electricity generation	LOLP LOLE LOLEV LOLF LOLH