Momentary Average Interruption Frequency Index (MAIFI)

Metric Details & Benchmarking Report Download

KPI Benchmarks : Momentary Average Interruption Frequency Index (MAIFI)

  • Benchmark Range 0.3 - 3.2
  • Benchmark Average 1.7
  • Benchmark Sample Size (n) 49

* Is High or Low Best: Lower is Better


Download a Sample Momentary Average Interruption Frequency Index (MAIFI)

KPI Details : Momentary Average Interruption Frequency Index (MAIFI)

Momentary Average Interruption Frequency Index (MAIFI) measures the average number of times a customer experiences a momentary interruption during the measurement period. 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. MAIFI, in conjunction with SAIFI, SAIDI and CADI, 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 : Momentary Average Interruption Frequency Index (MAIFI)

  • Take measures to protect electrical distribution equipment from inclement weather
  • Apply automated feeder switching systems to the worst performing feeders
  • Analyze causes of interruptions to determine what measures can be taken to improve reliability

KPI Calculation Instructions Momentary Average Interruption Frequency Index (MAIFI)?

Two values are used to calculate this KPI: (1) the number of instances in which the company’s customers experience momentary interruptions, and (2) the total number of customers served by the company during the measurement period. Only include momentary interruptions in the numerator of this calculation (i.e., outages/interruptions lasting less 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 Momentary Interruptions / Total Number of Customers Served) *100

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