At what temperature does water boil? 100 degrees C. So a temperature at 180 degrees will be sufficient. It is the flow rate that is going to be the decider to any EGS. If you have a look at this article from Geoscience Australia they state that electricity can be generated with temperatures as low as 85 degrees C. Out of all the other Geothermal companies only GDY have proven any kind of EGS resource.
http://www.ga.gov.au/image_cache/GA10663.pdf
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