Reliability refers to how certain you can be of having continuous supply. The electricity supply network is a large and complex system and there are great many factors which can affect your electricity supply.
Despite our best efforts to ensure that the supply of electricity to a customer is maintained and the occurrence and duration of interruptions is kept to a minimum there will be times when you may experience a power interruption. Interruptions can be varying duration from fractions of a second to several hours, depending on the cause and what has to be done to restore supply.
Power Quality problems occur when there are variations or fluctuations in the power supply. Power doesn’t go out altogether (as with power reliability problems), but lights may dim and appliances may not work correctly.
If this is happening, please report the problem to us so we can carry out a power quality investigation. This may involve putting a monitor on your power supply for a few days to record voltage levels.
The Annual Reliability and Power Quality Report documents the reliability and power quality information required as part of Schedule 1 of the Electricity Industry (Network Quality and Reliability of Supply) Code 2005.
| 2008/2009 | Report | Audit Report |
| 2007/2008 | Report | Audit Report |
| 2006/2007 | Report | Audit Report |
| 2005/2006 | Report |
Ever wanted to know how reliable your power supply is? See the maps attached to find out how your supply fared each financial year. The percentage figures are the ASAI (Average Service Availability Index) and highlight the availability of your power supplies. A figure of 99.95% means that your power supply was available 99.95% of the time.
| 12 months to January 2008 | Country | Metropolitan |
| 12 months to June 2006 | Country | Metropolitan |
| 12 months to December 2005 | Country | Metropolitan |
Western Power has a major program of works to improve the reliability of power supplies – reliability and capacity improvement projects.
Interference with your television or radio reception can be caused by appliances and equipment in your own home or on a neighbouring property, the antenna, if it is inadequate or in poor condition or the electricity network near you.
What to do:
1. Make sure you have a suitable antenna and that the antenna and your receiver are in good condition. For television, you should have an outdoor / rooftop antenna.
2. Check that no appliances in your home are causing the problem.
3. If you still suspect the problem is caused by the electricity supply system, you can arrange an investigation - report the problem
More information about the reliability and quality of your electricity supply is available in the following documents:
Electricity Networks Association Customer Guide to Electricity Supply (ENA)
Blackouts Glitches Flicker and Hum (ESAA).
Blackouts Glitches Flicker and Hum – Summarised version (ESAA).
Customer Guide to Electricity Supply (ESAA)
Customer Guide to Electricity Supply for Business Customers (ESAA)
To view PDF files you will need Adobe Acrobat Reader.
Customers with accessibility issues.
Page update on 1 October 2009
