Mont. Admin. r. 38.5.8613 - ELECTRIC UTILITY SYSTEM RELIABILITY
(1)
The following service reliability indices measure the frequency and duration of
service interruptions. They are recognized as standard reliability indices for
the electric utility industry and may be applied to entire distribution systems
and operating areas. For purposes of this rule, "interruption" means the loss
of service for more than five minutes.
(a)
"Customer average interruption duration index" is the average interruption
duration for those customers of electricity service who experience
interruptions during the year. It is calculated by dividing the annual sum of
all customer interruption durations by the total number of customer
interruptions.
(b) "System average
interruption duration index" is the average interruption duration per customer
served during the year. It is calculated by dividing the sum of the customer
interruption durations by the total number of customers served during the
year.
(c) "System average
interruption frequency index" is the average number of interruptions per
customer during the year. It is calculated by dividing the total annual number
of customer interruptions by the total number of customers served during the
year.
Notes
69-3-103, MCA; IMP, 69-3-201, MCA;
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