After quite a bit of searching for a good summary of Australian geothermal inferred resources, I found this one maintained by Geoscience Australia - apparently updated to 29 Mar 2011:
http://www.ga.gov.au/energy/geothermal-energy-resources.html
According to this KEN's naturally fractured Lemont project ties for 2nd place at 260,000 PJ.
Helps to put things in perspective.
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