Timely question - we just got our E bill today & it was about $290 for 3 months. I thought that was a bit high, but seeing other responses here, now I don't! We live in NSW - just 2 adults in a 2.5 bedroom house.
Have air con but only in the lounge room, run a fan in the bedroom (which I tend to leave on all night most nights), gas hot water & cooking. No drier, one chest freezer in addition to one average size fridge. We use mostly energy efficient globes. I think they do save a lot of electricity.