There's theoretical potential pretty much everywhere -- in that hot rocks exist underground, and some form of permeability can be created. Economical potential is quite limited, and technology dependent.

In particular, the Cooper Basin project, while technically viable with demonstrated generation capacity, died after failing to get investment needed for a transmission line. At the same meeting I referred to in my top post, I also heard that the CB project was about 600 km away from the nearest transmission lines.

N.B. I was not working on that project, so my knowledge is not firsthand.

Birdsville Qld, is still the only operating geothermal power generation plant in Oz as far as I'm aware.

If you are only interested in hot springs, there are developed baths on the Mornington Peninsula in Vic.

According to this (1) quite good actually.

But getting our government to do anything that isn't coal related. Pfft.

(1)http://www.ga.gov.au/scientific-topics/energy/resources/geot...