Geothermal 'battery' repurposes abandoned oil and gas well in Illinois, researchers report

https://news.illinois.edu/view/6367/626315322

"already has most of the needed infrastructure in place... sponge-like rock units with open pore space and minerals with optimum thermal conductivity sandwiched between insulating layers retaining fluids hot enough to generate electricity... injected water heated to 50°C... 82% thermal storage efficiency... average overall net cost of electricity generation of $0.138 per kWh... economically viable and profitable"

Related:

Fervo Energy’s Breakthrough Geothermal Technology Has Produced 3.5 MW Of Clean Energy

https://sundries.com.ua/en/fervo-energy-s-breakthrough-geothermal-technology-has-produced-3-5-mw-of-clean-energy/

Breakthrough announced on geothermal cooling project in Abu Dhabi, UAE

https://www.thinkgeoenergy.com/breakthrough-announced-on-geothermal-cooling-project-in-abu-dhabi-uae/

Tech breakthrough could boost states' use of geothermal power

https://techxplore.com/news/2023-08-tech-breakthrough-boost-states-geothermal.html

New approach may help extract more heat from geothermal reservoirs

https://techxplore.com/news/2023-09-approach-geothermal-reservoirs.html

Operational characteristics of the super-long gravity heat pipe for geothermal energy exploitation

https://www.sciencedirect.com/science/article/abs/pii/S1359431123015594

Huff 'n' puff geothermal fracking: Earth batteries at 200% efficiency