If you have your own personal electricity account, go to the Australian Government’s energy made easy web site:
https://www.energymadeeasy.gov.au/
You need to have your electricity invoice at hand so that you can enter your NMI. That number is shown on your electricity invoice. The web site will ask a few questions about how long you lived there. It will go through your last twelve months of electricity usage and give you a list of electricity plans which you could consider.
I use this web site at least once a year to see if I am on the cheapest plan available. Be prepared to change electricity supplier if a cheaper plan is available.
As secretary of a strata plan, I have also entered the NMI of the strata plan’s electricity invoice to find a better plan. As stated earlier, if you are locked into a long term plan or your hot water heating is part of the strata’s electricity plan, you don’t have as many options.