Plasma deep drilling is starting to hit the market which should make geothermal available pretty much everywhere. The sad thing about current geothermal is that it’s not even used in areas where you do have heat near the surface, the reason is that geology is quite unpredictable and every borehole is a crap-shoot between hitting the jackpot and having to pay damages out of your arse because people’s houses collapse. Deep drilling has none of those issues.