I am surprised geothermal hasn’t been pursued more. Inside of this planet is really hot, not all that far down from the surface. Get Boring Co. on it already.
If this turns into something big, U can be SURE the climate changers will crap all over it, declaring it to be the worst idea EVER!
The real reason the interior of the earth is hot is that there is a small amount of heat generated from radioactive decay. The surface/volume ratio of the earth means that there is a substantial heat flux which means high temps inside.
Do not tell this to anyone liberal or they will equate geothermal with nuclear.
Where I went to undergraduate they had some geothermal research projects. They never panned out into anything.