Section 8(4) in Rajasthan Electricity Regulatory Commission (Transmission Licensee's Standards of Performance) Regulations, 2004
(4)System Average Interruption Frequency Index (SAIFI). - This index gives number of interruptions in power supply to loads expressed as per year per EHV GSS for a voltage class. All interruptions of duration exceeding 5 (five) minute at a time shall be counted in computing this index. Interruptions due to acts of nature, orders of civil/military authorities, scheduled, outage (including three shift operation of agriculture pump sets), load shedding to meet capacity shortage, failure of PGCIL andBBMB's transmission system or failure of generating units (leading to grid failure or system islanding) are to be excluded.SAIFI = ∑1/N :Where∑1 = Sum number of interruptions exceeding 5 minutes at a time duration in the year for the voltage class.N=Number of EHV sub-stations in service at the beginning of year having that class of voltage supply.
