ASUI

The Average Service Unvailability Index (ASAI) is a reliability index commonly used by electric power utilities. It is calculated as

${\mbox{ASUI}}={\frac {\sum {U_{i}N_{i}}}{\sum {N_{i}\times 8760}}}=1-ASAI$

where $N_{i}$ is the number of customers and $U_{i}$ is the annual outage time (in hours) for location $i$.

See also

• ASAI
• SAIDI
• SAIFI
• CAIDI
• CAIFI
• MAIFI