First the $200,000,000, then I will tell you.
Geo thermal is everywhere. I have been looking for a dry oil well, but they are cement plugged.
It could be shallow. Drill well, case and cap, do a good job, pressure tight.
The full job, a six foot cement plug around the 12" casing, going down thirty foot, 1/3, two, and ten meters, for the rest of the world.
Drill down several hundred foot in a known dry rockwith casing. Lower an inner pipe, 6" with spacer/strainers on the outside, every three meters, or ten foot.
You will need some water on top, and a pressure pump. This is pumped into the inner pipe. At the top, a 10" valve stack, several stacked.
An outlet is piped from the outer casing to a steam turbine.
Now open the top valve, drop in a cylinder of Thermite, with a lit magnisum fuse, and close the valve. Thermite is made of rust and beer cans, flour, slows the burning, and sometimes copper for the lovely blue/green color. I would not post the details, do not try this at home, beer cans impair thinking.
Thermite burns at 5200 degrees, You have just built a volcano. It will vaporise most things, I like Titanium casings. Then a lot of just rock. Free drill below the cased part.
The result and operation. A puddle of liquid rock, a lot of pressure, and it is hot. It is also trapped, or launched, according to how well designed and built. Key hint, start with just a little Thermite charge.
Now pump water under pressure into the inner casing, 2,000 psi, and here comes another launch possibility, Have a steam relief valve on the outer casing that lets pressure escape through the turbine.
The spacer strainers are to keep water from blowing up the outer casing, which is like having rocks going through the turbine. Standard steam tech.
A double valve on top lets you drop in more thermite when the flow slows, it will burn under water, in steam, in outer space. Open top valve, drop in thermite, with a lit magnisium fuse, close and open bottom valve, hope real hard it drops down the pipe before it lights. Close bottom valve, run.
Anyway, it is cheap clean heat, and a lot of it, made of the most common materials,
My vision of this is a layer of superheated steam, above the fires of hell, capping it with pressure, and super heated steam can be denser than water. By pulling from the top the ash and rock stay below, so clean steam, at several thousand degrees. There is a bit of pressure involved,
It also heat insulates the casing, Titanium can take several thousand degrees, but becomes a vapor at 5200.
That is what we want as it goes through a multi expansion turbine, and cranks out big kilowatts.
The spent steam could warm an acre or ten of greenhouses. Or heat a small village. Both, and steam as power through the town.
The towns people will have to empty and save beer cans, soda cans, and collect rust.
The only by product is distilled water. Useful in the town and green houses.
The dangers are ground water, which as it flashes to steam would blow a huge hole in the ground, acres. There is water in even dry rock, Intersticial water, It will become steam, be prepared.
Once the tame volcano is in operation, it can be used forever. Do not be fooled by "Tame", it is just waiting for freedom. Give it the slightest chance, heat rises. Only the steam can rob the heat and control the beast.
If it blows. it is rock ash, water, and nothing extra dangerous or long lasting, mostly it would make richer garden soil. There is the well head, double casing, which could take a sub orbital path, or melt into the ground. It will burn out quickly on it's own. The new town land fill that is a vitried hole in the ground and good for many years.
An old coal burning power plant has all the turbines, generators, wiring, and is hooked to the grid. This is a lot cheaper heat than low grade coal, fires, stacks, boilers, and much cleaner.
I would do it, but at 65 I am grading my front yard, leveling the walk, and planting flowers. As I do not like lawns, I will plant a bank of red flowers where it used to be a boring green.
There are answers, within existing technology, cheap, long lasting, and somewhat safe. It is time for me to pass on projects I will never get around to. I am so old I am getting a sidecar for my motorcycle.
<---- my toy, had it for 35 years.
Have fun with The Dragon.