Section 7(a) in Rajasthan Electricity Regulatory Commission (Distribution Licensees Standards of Performance) Regulations, 2003
(a)System average interruption frequency index, which shall be calculated by dividing the total number of sustained interruptions to consumers in a year by the total number of consumers served. An interruption in supply to a consumer shall be considered as one interruption to one consumer. In case of failure of a line or transformer, number of interruptions shall be equal to the number of consumers affected. The index shall be expressed as number of interruption per consumer per year and shall be calculated annually.
