Customer Average Interruption Duration Index (CAIDI) represents the average time to restore service per interrupted customer (minutes/interruption)
System Average Interruption Duration Index (SAIDI) represents the average time each customer is interrupted (minutes/year)
System Average Interruption Frequency Index (SAIFI) - Represents the average number of interruptions per customer. (interruptions/year)
Momentary Average Interruption Frequency Index (MAIFI) represents the average number of momentary (two minutes or less) interruptions per customer:
Average System Availability Index (ASAI) represents ratio of time the system provided service to each customer.
Total hours service was demanded