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Why Resiliency in the Electrical Grid Should Be Measured from the Customer’s Perspective
Reliability performance is core to the utility industry. Utilities strategically design and invest in their system to maximize reliability performance traditionally measured by System Average Interruption Frequency Index (SAIFI), System Average Interruption Duration Index (SAIDI), and/or Consumer Average Interruption Duration Index (CAIDI). These quantitative metrics largely drive utility investment decisions, shape strategic priorities, dictate regulatory approvals, and determine cost recovery. While these metrics are generally good indicators of system performance, the commonly used SAIFI/SAIDI/CAIDI indicators actually refer to “blue sky” system performance, where hurricanes and other l