Interesting . NZ has had a geothermal plant for decades that is situated in a volcanic area (and right next to tourist hotspots of Rotorua and Taupo). They for

Interesting . NZ has had a geothermal plant for decades that is situated in a volcanic area (and right next to tourist hotspots of Rotorua and Taupo). They force cold water down and use the steam to drive turbines. No idea on the efficiency but the fact its been operating for decades would suggest its good enough to be viable.