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Reliability

We are continuously working to improve the reliability of electricity supply to our customers and each year we aim to meet the reliability targets set by the Australian Energy Regulator (AER).


Electricity reliability measures

The electricity regulatory period is changing in 2021 from calendar year to financial year. Our targets for the first 6 months of the year are below. The final reliability targets for the remaining half of the year will be published in May. 

Measure for 1 Jan 2021 - 30 June 2021
Supplied by Urban feeder #
Supplied by Short Rural feeder #
Supplied by Long Rural feeder #
On average, the number of minutes a customer will experience loss of supply due to unplanned interruptions per year. (e.g. lightning, storm, fauna) (USAIDI)
44 mins
87 mins
102 mins
On average, the number of unplanned interruptions a customer will experience per year (longer than one minute).(USAIFI)
0.56
1.16
1.28
On average, the duration of an unplanned customer interruption (UCAIDI)
80 mins
75 mins
79 mins
On average, the number of momentary interruptions (less than one minute) (MAIFI)
1.41
3.14
5.79
On average, the number of minutes a customer will experience loss of supply due to planned interruptions per year (e.g. maintenance) (PSAIDI)
78 mins
121 mins
158 mins

The AER defines:

  • An Urban feeder as a High Voltage circuit with load density greater than 300kVA/km. Covers outer metropolitan suburbs and major towns
  • A Short Rural feeder as a High Voltage circuit which is not an Urban feeder with total length less than 200 km. Covers areas near major towns
  • A Long Rural feeder as a High Voltage circuit which is not an Urban feeder with total length greater than 200 km. Covers more remote rural area

In the event that we do not meet reliability thresholds established by the AER, some customers may be entitled to a Guaranteed Service Level payment under clause 6.3 of the Electricity Distribution Code. If you would like to know more, please contact us.