I have always opposed conventional geothermal power because it injects fresh water into underground rock faults and uses the resulting steam, losing most of the water in the process.  This huge water use and the possibility of contaminating aquifers with mineral bearing sulphate rock leechate from escaping steam, put the kibosh on this technology for me.

A brilliant commetor in Gristmill came up with a new idea.

He suggested teaming hot rock steam with solar furnace steam.  That way the rocks get to rest and recuperate when the concentrating solar plant is powering the turbines.  Molten salt storage could use solar even at night, cutting the time/heat needed from the hot rocks.  The rocks lose their heat after 10 years of constant operation, this symbiotic design cures that.

The beauty is that the turbines are powered by  both sources.

All water would need to be recycled from both solar and hot rocks, a closed loop of pipe would be needed, to deal with high water use objections.   Furthermore extra power produced that can't be used by the grid should go for waste water filtration and desalinization, actually making this system a big net water producer.

The design could use long drill pipes going down into the hot rock, then a smaller spray pipe that goes down the center.  The water would spray on the hot pipe and the steam would come up into the turbines, then  be recondensed with ground source cooling. Recycled 100%, barring a leak here or there.

The ground source cooling loop could heat a greenhouse or factory or mall, storing the heat seasonally under the building.  Cool desert climate like Colorado might use this.

The big plus is that this combined system provides a stable base load, something to count on in case of wind or solar dips.  And it provides huge peak surpluses that can go to stored heat/cold in building mass and fresh water production.  That water is renewable energy stored as a valuable commodity, vastly enhancing the financial model.  And shortening the payback period.

This feature would attract capital from desert nations especially, think oil rich nations.  Water is the oil of this century.  That justifies over building wind and solar energy capacity.  It can always be used (profitably) to reclaim waste and sea water.