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Guide & Statistics: 2025 Electric Reliability
1/20/26, 5:00 PM
To measure system performance, the electric utility industry has developed several measures of reliability. These indices known as SAIFI, SAIDI, CAIDI, and ASAI, include measures of outage duration, frequency of outages, response time, and system availability.
This brief guide reviews the four key indices used to evaluate electric reliabilty and includes the 2025 performance metrics.
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