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Thermally Anomalous Granite (TAG) Model Analysis of Petratherm's geological and geophysical database has highlighted the location of a number of thermally anomalous granites within the SAHFA. Measurements on outcrops of these exceptional granites in the Mount Painter region in the northern Flinders Ranges indicates that they produce an average of eight and up to twenty five times the heat of most granites and 50% more heat than typical rocks within the SAHFA. This makes them amongst the most thermally active granites in the world. Thermal modelling indicates that under favourable conditions, rocks meeting the TAG criteria can generate temperatures of around 250°C at depths of 3.5 kilometres.  Depth vs Temperature Model for a Typical Thermal Anomalous Granite Body.
Enhanced Natural Thermal System (ENTS) In some instances, the heat transfer from a TAG or RIO body may be enhanced by favourable geological conditions. Specifically, pre-existing faults may already focus natural superheated groundwater. These fault-controlled heat reservoirs telescope potential resources much closer to the surface, allowing cheaper development costs. Development of a heat exchanger is also much simpler, as there is already a natural flow system, which can be enhanced to maximize heat extraction.
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