The primary cycle involves flashing the water to create steam for a steam turbine. This is the cheap cycle.
The best of the remaining heat in the hot water is transferred to an organic fluid, eg pentane, the second turbine being driven by pentane. With typically 7% eff in the ORC, and close heat exchanger approach temperatures, the heat exchangers are obviously a huge and expensive part of the plant. You are talking about football field sized aircoolers.
Cooling towers for plants using water cooling are also enourmous feats of engineering.
Like yourself, I like the scope for cost savings on the surface, however in the case of the Australian industry atm, the greatest challenges are undoubtably subsurface and markets.
EL
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