Why not is explained in David McKay's book Sustainable Energy - without the hot air

https://www.withouthotair.com/c16/page_96.shtml

The problems are that rock isn't a good conductor of heat, so once you've cooled a bit down, you have to wait for it to warm up. Warming only happens very slowly at the rate of < 50mW / m² which limits the amount of power you can get out.

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hodgehog11 14 hours ago | parent | next [-]

That's a really good point, and it does take the wind out of the sails. Isn't it possible that eventually we could drill deeper?

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cameldrv 10 hours ago | parent | prev [-]

Couldn't you frac the rock like they do with oil and gas drilling or have a branching borehole?

	▲	kragen 3 hours ago \| parent [-]
		Yes, that's what this article is about.