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This could be a subject for another post, but I think dry rock geothermal will work out expensive. Problems include lack of control over water passage ways, the low temperature gradient (I know about Kalina cycle yada yada), the need to conserve water in dry or uranium bearing areas, isolation from transmission lines and the need to keep the beefed up rig coming back to drill new holes.
I think solar thermal with storage will work out cheaper and more flexible. Still I think a couple of serious geothermal startups should get public assistance to work out the bugs.
Well - there are plenty of people trying to see if HFR geothermal works (see my post today on the topic for most of the gory details).
I think its a big enough potential source that it is worth putting some time and money into.
The Hunter Valley area is interesting in this regard, as there seems to be a lot of potential that would be very easy to tie into the existing grid.
Solar thermal is an easier option of course - its just a matter of getting the people in Canberra to help kick things off (carbon taxes would help).