that an electricity customer can expect over a fixed period of time - usually 1 year. Electric utilities interpret the MAIFI value differently, in that they only consider interruptions of a certain duration. For example, some calculate interruption durations of one minute, others five minutes. The
MAIFI value is the quotient of the cumulative interruption time to the total supply time. The MAIFI value is not used as frequently as the index for supply reliability in electricity networks, the Customer Average Interruption Frequency Index (CAIFI) or the index for the average interruption frequency, the System Average Interruption Frequency Index (SAIFI).