[xendipity]

"EGS are engineered reservoirs, created beneath the surface, where there is hot rock but limited pathways through which fluid can flow. During EGS development, the injection of fluid into the hot rock enhances the size and connectivity of fluid pathways by re-opening fractures. Once completed, EGS function just as natural geothermal systems do: fluids circulating through the hot rock carry energy to the surface through wells, driving turbines and generating electricity. EGS could provide up to 100+ GWe of economically viable capacity in the United States. This potential could supply green electricity to over 100,000,000 American homes, and represents a domestic energy source that is clean, reliable, flexible and renewable."

[IgorPartola]

I can see the headlines from 40 years in the future: Geofracking Responsible for Devastation of the State of Tennessee as Record Breaking Earthquake Shakes the Eastern Seaboard”

Also how exactly is extracting heat from underground renewable? What exactly renews the constantly cooling core of our planet?

[burlesona]

The core of the earth is essentially a fission reactor with quite a lot of fuel available. While this heat source is technically finite, so is the sun, and the universe itself. If you somehow live to see the heat death of the universe, you’re probably SOL.

But for humans living on earth today, and in timescales we care about (millions of years), the Earth’s core won’t run out of heat.

[martythemaniak]

As others have pointed out, nothing is renewable on long enough timelines. The earth will burn out, the sun will burn out, eventually the universe will burn out.

[Lammy]

Try “from 2019” https://news.ycombinator.com/item?id=30139155

[baremetal]

radioactive decay.