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Seems to me the problem of not enough heat extraction has a few possible solutions.
Increase the volume, especially the surface area of the "hot pocket"
Use the thermal conductivity of water to extract the heat
Drill near volcanically active areas to increase the temperature
I've always wondered why a heat pump couldn't be used to achieve the necessary temperature for steam generation? They're at least 300% efficient, so in theory one should be able to run a steam turbine from a heat pump and have a net gain in electricity, especially if you're already starting with pretty hot temperatures.
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