Could you elaborate on to what you are referring? Geothermal heating with heatpumps is **incredibly** efficient. Costs are significant because digging holes isn’t cheap, but you’ll habe trouble finding a way of heating (and cooling for that matter!) a home more energy-efficiently than with a geothermal heatpump.
I guess if you actually wanted to run a *generator* with geothermal heat your plans are limited by whether you live near a tectonic fault or not – you’d need a volcanic vent.
One of the main issues with geothermal energy is the relatively low temperature of steam produced. For a number of reasons ranging from pressure limits to flow restrictions, the steam coming out of a geothermal borehole is generally colder than what a boiler can achieve — and it’s the energy beyond that required for boiling that can be extracted by turbines, so hotter steam can have energy extracted more efficiently before it condenses again.
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