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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 outperform the reliability targets set by the Australian Energy Regulator (AER).


Electricity reliability measures

In accordance with the requirements of the Australian Energy Regulator (AER) and as part of our commitment to customer service, we’re aiming for the following targets:

Measure for 2017
Supplied by Urban feeder #
Supplied by Short Rural feeder #
Supplied by Short 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)
81 mins
188 mins
233 mins
On average, the number of unplanned interruptions a customer will experience per year (longer than one minute).(USAIFI)
1.09
2.28
2.82
On average, the duration of an unplanned customer interruption (UCAIDI)
74 mins
82 mins
83 mins
On average, the number of momentary interruptions (less than one minute) (MAIFI)
2.79
5.82
11.37

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 (approximately 50,000) 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.