It's a great idea and they do it, particularly in Iceland and Hawaii, iirc. My recollection is that the big issue with geothermal is the minerals leaching out

It's a great idea and they do it, particularly in Iceland and Hawaii, iirc. My recollection is that the big issue with geothermal is the minerals leaching out of the drilled rocks and fairly rapidly fouling the near/above-round equipment or depositing on the tubes/pipes closing them down. I understand that progress had been made; if anyone has more details handy, could you post links?