Reliability Indices

Customer Average Interruption Duration Index (CAIDI) represents the average time to restore service per interrupted customer (minutes/interruption)

  • CAIDI: Sum of customer interruption duration: 34.19 minutes

System Average Interruption Duration Index (SAIDI) represents the average time each customer is interrupted (minutes/year)

  • SAIDI: Sum of customer interruption duration: 37.13 minutes

System Average Interruption Frequency Index (SAIFI) - Represents the average number of interruptions per customer. (interruptions/year)

  • SAIFI: Sum of Customer Interruptions: 1.086

Momentary Average Interruption Frequency Index (MAIFI) represents the average number of momentary (two minutes or less) interruptions per customer:

  • MAIFI: Sum of Momentary Customer Interruptions: .592

Average System Availability Index (ASAI) represents ratio of time the system provided service to each customer.

  • ASAI: Total hours service was available

Total hours service was demanded

Past Years ASAI Ratio

  • 2017: n/a
  • 2016: .99929
  • 2015: .99995
  • 2014: .99994
  • 2013: .99992
  • 2012: .99994
  • 2011: .99992
  • 2010: .99996
  • 2009: .99992
  • 2008: .99993
  • 2007: .99996
  • 2006: .99995
  • 2005: .99987
  • 2004: .99998
  • 2003: .99994
  • 2002: .99999
  • 2001: .99999
  • 2000: .99997
  • 1999: .99920
  • 1998: .99940
  • 1997: .99975
  • 1996: .99996
  • 1995: .99995
  • 1994: .99995