From Wikipedia, the free encyclopedia
Jump to: navigation, search

The Average Service Unavailability Index (ASUI)[1] is a reliability index commonly used by electric power utilities. It is calculated as

where is the number of customers and is the annual outage time (in hours) for location . ASUI can be represented in relation to SAIDI (where annual SAIDI is given in hours) as

See also[edit]


  1. ^ Pham, Hoang (8 April 2003). Handbook of reliability engineering. Birkhäuser. p. 514. ISBN 978-1-85233-453-6. Retrieved 21 July 2011.