* Is High or Low Best: Lower is Better
System Average Interruption Duration Index (SAIDI) measures the total amount of time that an average customer experiences service 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. SAIDI, in conjunction with SAIFI, 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.
The total number of minutes in which a customer's service is interrupted divided by the total number of customers served by the utilities company over the same period of time.
Two values are used to calculate this KPI: (1) the total number of minutes in which the company’s customers experience service interruptions, and (2) the total number of customers served by the company during the measurement period. 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).
(Total Number of Minutes Customer’s Service is Interrupted / Total Number of Customers Served) *100
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