What’s hilarious about this is the fact that they are betting the ranch on water supply.
This scheme can only be perpetrated in areas with a surfeit of water. You can use salt water instead, but eventually you have to capture the steam. Eventually, you have to turn that ratwheel to get the rotor to turn through the stator.
All those impurities in the steam will eat turbines like they were twinkies at a grow house.
But hey, Thorium based nuclear works, and has only one downside - you have to actually build the plants in order to get the power from them. Good thing a really big one would be about the size of a small Costco.
Just like in a nuclear power plant, you don't have to take the steam directly from the heat source to the turbine. Closed loop circulations with intermediate heat exchangers are very likely to be used.
Thorium based reactors move brine (molten salt) through their plumping pipes, this is as bad or worse than mineral rich fluids coming from a volcano. That’s why thorium reactors never get built, you have to tear them down and rebuild them every year to get rid of the salt corrosion and build up in the pipes. Not cost effective.
Here they should cable suspend a boiler over or on the volcano to heat exchange a liquid inside to power a turbine...makes about as much sense pouring water on volcano.