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AltaRock has figured out how to use fracking to get more heat out of a geothermal well, but work remains before the energy source can dent carbon emissions.
Carbon dioxide captured from power plants could make geothermal energy more practical.
Fluid extracts more heat out of low-temperature wells.
The approach could boost U.S. lithium production—just as demand is set to soar with increased electric-vehicle usage.
An underground “heat nest” design avoids the need to fracture the rock.
DOE funds will help finance construction of a geothermal facility using advanced technology.