System Average Interruption Frequency Index (SAIFI)

Metric Details & Benchmarking Report Download

KPI Benchmarks : System Average Interruption Frequency Index (SAIFI)

  • Benchmark Range 0.47% - 1.79%
  • Benchmark Average 1.1%
  • Benchmark Sample Size (n) 44

* Is High or Low Best: Lower is Better


Download a Sample System Average Interruption Frequency Index (SAIFI)

KPI Details : System Average Interruption Frequency Index (SAIFI)

System Average Interruption Frequency Index (SAIFI) measures the number of instances in which customers experience service interruptions divided by the total number of customers served by the utilities company over the same period of time. A relatively high value for this metric is typically related to a few common factors, including excessive breaker or re-closure operations (i.e., scheduled service interruptions that resolve temporary faults in the system), power supply insufficiency, distribution system equipment outages (due to damage, bad weather, faulty equipment, etc.), and outages due to non-payment of the utilities service. SAIFI, in conjunction with SAIDI, CAIDI and MAIFI, are indices used to measure the reliability of a utility company's power system, excessive values of which can lead to poor customer satisfaction and high attrition rates.

KPI Best Practices : System Average Interruption Frequency Index (SAIFI)

  • Analyze causes of interruptions to determine what measures can be taken to improve reliability
  • Install bird covers on power lines or provide a safe nesting area to minimize outages caused by birds
  • Perform infrared inspections to identify potential problems in distribution systems

KPI Calculation Instructions System Average Interruption Frequency Index (SAIFI)?

Two values are used to calculate this KPI: (1) the number of instances in which customers experience service interruptions, and (2) the total number of customers served by the utilities company over the same period of time. Only include sustained interruptions in the numerator of this calculation (i.e., outages/interruptions lasting more than 5 minutes). Count each individual meter separately for this calculation (e.g., if a single customer is assigned multiple meters, count each meter as an individual entity).

KPI Formula :

(Number of Customer Service Interruptions / Total Number of Customers Served) *100

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