SAIDI, CAIFI, & SAIFI: A Guide to Utility Reliability Metrics

SAIDI, CAIFI, & SAIFI: A Guide to Utility Reliability Metrics
In this report, we break down the meaning of some important metrics (commonly referred to via acronym) used by the Federal Energy Regulatory Commission, along with utilities themselves, when measuring utility service reliability.

The Federal Energy Regulatory Commission (FERC) is “is an independent agency that regulates the interstate transmission of natural gas, oil, and electricity.” Its mission is to provide efficient, safe, reliable, and secure energy for consumers through “appropriate regulatory and market means.”

The FERC uses reliability statistics as quantitative metrics for measuring the quality of management practices employed by various utilities. Standards may vary from utility to utility (e.g. regions with more storms or colder weather may face more risk for service interruptions). For this reason, these metrics are most valuable for making period-to-period comparisons within the same utility as it seeks continuous improvement.


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