Actually I don't think they will normally (maybe ever?) need to drill down tens of km, or even ten km, to get to enough heat. I would like to see steam turbine

Actually I don't think they will normally (maybe ever?) need to drill down tens of km, or even ten km, to get to enough heat. I would like to see steam turbines displaced by something that doesn't need so much maintenance (high-pressure CO2?), so that geothermal could become more competitive with other renewables. But developing tech like that is no walk in the park. GE will do it when their market for steam turbines starts to fall off, faced with renewables.