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There seems to be a real drawback to deep geothermal for power, earthquakes like the one in Basil in 2006 after deep geothermal was tried there, deep geothermal involves digging deeper than to the steam pockets a few thousand feet down with conventional geothermal. Deeper down the dry rock is shattered with water injected to one well that shatters the rock by pressure and the flow rate. A second well then extracts the water and its heat to the surface, from the shattered rock.
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Another plan involves dropping a sphere of radioactive waste from atomic power plants that would then use the heat and weight of the uranium inside a tungston sphere to melt downward to 37 miles to bury the waste and also be used with sonar signals from the probe to find out what the inner earth is like, "on the magnitude of importance to a mission to Mars".
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This seems to be a good idea, no more radioactive waste or as if because it's buried deep down, almost absolutely as if.
An MIT study shows that deep geothermal has 2000 times as much power as the US may use. The problem seems to be about the earthquakes, there are those who glibly predict that the chances of risk by way of deep geothermal (or other power like deep geothermal solar power!) are minimal. "If used far from active earthquakes, the chances of it causing a big earthquake like the ones in SA are quite small". This seems reminiscent of the glib assurances of BP before the oil disaster, there may be no way to tell because shattering the rock seems like drilling a mine, most of the time it won't collapse, but there's always more chance if the mine is being dug there will be than there won't sooner or later. As more and more people move to earthquakes zones, even a small chance might have huge impact on the lives of millions of people. If there was an earthquake like the Basil quake the first time deep geothermal was tried this seems a real caution to the simple plan for geothermal. Even so it seems to be a great type of power, the power is there, if the earthquake risk were extremely minimal and we could extract the heat we all could be richer, for example because the cost of moving food is half of it's price food and many other goods would be half the price..
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While the Basil method might be good for safety the following plan might be better; To go deeper than 3 miles where the well in Basil was dug we might use the uranium probe not just for research and to reduce the radioactive waste, it also may make an excellent way to move geothermal much deeper. The uranium may be a low cost drill, we let it sink at the tip of the drill well and as it sinks it drills deeper and deeper. The deepest we can go by conventional drills is about 4 miles, at that depth the rock is fluid under pressure. When they pull up the drill bit to go deeper and put another bit down by that time the rock has flowed to fill the well and they haven't drilled much deeper. A uranium bit would solve this problem "well"! It would dig not just a narrow well it would be 10 feet wide.
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Two wells both dug by the uranium nearby would be used, one on one side and one say five feet to the side. Once the wells were dug the base would be sealed off and connecting wells would be dug by robots between them nearer the depth. Next gravel or other material like rocks of the right worth would be dropped in the wells, alternating with one way flow valves, rock then valves then rock in alternation.
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To extract the heat water would be pumped down one well, the valves would make it expand deeper as it heats up! It reaches the bottom and then automatically returns to the surface by the valves. To save water the wells are in a simple continuous loop all the way from deeper to the connection to turbines at the top. For optimal use another working fluid than water might be used in combination with the best rock or rock substitute. For example the surface area and absorption of the rock or its substitute might be best if combined with the right type of water to extract the heat the most optimally for the cost, etcetera.
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If "deep geothermal is safe" far from fault lines, this would make it much safer because the uranium does all the drilling. Thus the higher heat deeper down, a large surface are of the 10 foot wide well and the rocks inside would give the same surface area as the plan in Basil, even so because most of the volume of the well is deeper down where the rock is more fluid (flowing slowly under pressure) all the forces are more in equilibrium. Beyond 4 miles down the risk would not go up! And because the well higher up is much reduced in volume compared to shattering the rock here at 3 miles as in the Basil well the overall risk of earthquakes is almost 0. They say it's safe for the 3 mile plan perhaps because like BP they have their eye on the power, this would be an alternate way that might cost less because of reduced drilling cost, give more heat and it might be much safer for millions of people.
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Deep geothermal might still have value for earthquake control. After a major quake hits if we have good enough sensors like the new neutrino experiments where a reactor makes the beam and the water sensor finds it after it goes 150 miles through the earth in Japan, if the forces and pressure are reliably sensed by this and other good imaging machines we might then be able to know where the pressure is and dig the wells to then shatter the rock and relieve the pressure before it would build up. This wouldn't stop the California earthquake but it may be useful in the future and after the califiornia quake and others happen. In truth the method of the link below (of balancing the earth's torque) if used in time with the method I describe may actually be used in time to even prevent the California quake too!
Changes in the earth's torque may reduce unbalanced tidal forces, land and water that generates heat and thus earthquakes, because the Earth is not quite round. Click Here for another possible way Earthquakes May Be eventually Reduced by 50% (by changing the torque).
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