Dear Emily, 07:50 Jul 30, 2011
"парогидротермы" is a neologism created by authors and refers to places on the Earth where magma layer comes close to the surface. The further details I cannot treat unambiguously, because there we meet two possible cituations, - either natural subsoil water layer exists close to that place or not.
In the last event there other water source must be used for steam production. That's evident that the longer distance of the water delivery path, the lower efficiency of the energy produced.
The third major design option is use of alternative liquid with lower boiling point like alcogol in a two-loop plant design, though no particular operating plant is known to me.
In any case all and every geothermal power plant utilises heat of the Earth's core.
But it can be efficient only if built in places of the Earth's crusts. | 
The translation workplace 
peer agreement (net): +2
