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It is calculated by dividing the total number of customers interrupted by an outage by the total number of customers in the system. In short, SAIFI describes how often the average customer experiences an interruption. SAIFI can be improved by reducing the frequency of outages through better preventative maintenance.
While the IEEE describes SAIFI, SAIDI, and CAIDI as the “big three,” the other terms in the list provide helpful context. These terms are virtually always analyzed or compared within a particular period. Examples include within a specific year, between the same months from different years, or within a specific storm.
SAIFI refers to “System Average Interruption Frequency Index.” It is calculated by dividing the total number of customers interrupted by an outage by the total number of customers in the system. In short, SAIFI describes how often the average customer experiences an interruption.