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The technology allows geothermal energy to be generated at half the cost and at par with lithium-ion batteries but with 200 percent efficiency.Get a daily digest of the latest news in tech, science, and technology, delivered right to your mailbox. Subscribe now.
The oil industry has used this approach for many decades, where steam is injected into the shale deposit and left there for many hours to heat the leftover oil. The added heat makes the oil less viscous and easier to be pumped out. Sage found that the system works at 70-75 percent efficiency and can generate 200 kilowatts of energy over 18 hours or even one megawatt for 30 minutes. The team also measured seismic activity but found no traces during its operations., the temperature of the surrounding rock is significantly higher than the ground, reaching 350-430 °F . The water storage in such wells transfers the heat to the water, which is also let out when the valve is opened.
Further, the company proposes that in areas where multiple wells are located close, the heat exchanger can remove the heat from the water, which can then be pumped into an adjacent well to heat up. The measured fluid losses in Sage's setup were just two percent, and recycling the water makes the system even more sustainable in the long run.
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