EGS is a technology related to fracking. It gets a boost from the maturity of fracking itself, but it is also expensive, kind of risky financially -- an expensi

EGS is a technology related to fracking. It gets a boost from the maturity of fracking itself, but it is also expensive, kind of risky financially -- an expensive hole might need to be abandoned -- and depends on geological details of the site to determine its suitability. The newer technology, what amounts to drilling by vaporizing rock with microwaves, enables drilling to much greater depths quickly and cheaply. Being new, it has not actually been used yet, but once mature should be less dependent on local geology, and not generate (sometimes reasonable) fears of causing damaging earthquakes, and should yield more power from a single borehole than EGS gets from two more costly holes. But there seems to be no prospect of commercial deployment before 2028, and something could go wrong on the way, delaying or even deep-sixing it. EGS, even where it works best, is more costly than solar and wind. Working independently of weather gives it a leg up, but money for it is less available than for those, for now, because we haven't enough of those yet.