Section 10 in Maharashtra Electricity Regulatory Commission (Standards of Performance of Distribution Licensees, Period for Giving Supply and Determination of Compensation) Regulations, 2014
10. Reliability Indices.
- 10.1 The Distribution Licensee shall calculate the reliability of its distribution system on the basis of number and duration of sustained interruptions in a reporting period, using the following indices :-(i)System Average Interruption Frequency Index (SAIFI) ;(ii)System Average Interruption Duration Index (SAIDI) ; and(iii)Customer Average Interruption Duration Index (CAIDI).Provided that while calculating the above indices, the following types of interruptions shall not be taken into account :-(1)Scheduled outages ;(2)Momentary outages of a duration not more than Five minutes ;(3)Outages due to the failure of the grid ;(4)Outages due to the reasons described in Regulation 11.1 below.10.2The Distribution Licensee shall maintain data on the reliability indices specified in Regulation 10.1 above for each zone/circle/division/sub-division on a monthly basis.10.3The Distribution Licensee shall put up, at the end of each month, such monthly information on reliability indices, on internet website of the Distribution Licensee and shall submit such report quarterly to the Commission as per Annexure IV.10.4The Distribution Licensee shall make concentrated efforts to achieve the standards of reliability fixed by the Commission from time to time.10.5Method of computing Reliability Indices-(a)System Average Interruption Duration Index (SAIDI) = It is average duration of sustained interruptions per consumer.SAIDI = ∑ ri x Ni / Nt(b)System Average Interruption Frequency Index (SAIFI) = It is average frequency of sustained interruptions per consumer.SAIFI = ∑ Ni / NtWhere,i = an interruption event;ri = restoration time for each interruption event;Ni = number of consumers who have experienced a sustained interruption during the reporting period; andNt = total number of consumers of Distribution Licensee(c)Customer Average Interruption Duration Index (CAIDI) = It is average interruption duration of sustained interruptions for those consumers who had experienced interruptions.CAIDI = SAIDI/SAIFI.
