Enhanced Geothermal Systems (EGS) could soon make clean energy from Earth's natural heat cost-competitive with grid power ...

(Robin Lubbock/WBUR) Networked geothermal systems use underground pipes and electric heat pumps to exchange heat with the earth. In the winter, the system pulls heat stored hundreds of feet below ...

Carved into the rock beneath a Swedish city, a huge man-made cave system dating back to the ... warm water from the top of the cavern to the heat exchanger, where its heat is passed into the ...