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Principles of Enhanced Geothermal Systems (EGS)

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Enhanced Geothermal Systems (EGS) represent a breakthrough in renewable energy, allowing for geothermal power generation in areas lacking natural hydrothermal resources. By using hydraulic stimulation to increase rock permeability, EGS plants can extract Earth's heat to generate electricity. This technology promises a consistent energy supply and has a global application potential, with projects in various countries exploring different stimulation methods for efficient energy extraction.

Principles of Enhanced Geothermal Systems (EGS)

Enhanced Geothermal Systems (EGS) are an innovative approach to geothermal power generation that extends the potential of this renewable energy source beyond areas with natural hydrothermal resources. EGS technology makes it possible to extract heat from the Earth's crust in locations where natural water and permeable rock are not present. By artificially creating or enhancing the permeability of hot dry rock formations through methods such as hydraulic stimulation, EGS can access the thermal energy stored in the Earth's crust, thus broadening the geographical scope for geothermal energy development.
Geothermal power plant with cylindrical tower from which steam comes out, connected pipes and gray building, against a background of semi-arid hills and blue sky.

Hydraulic Stimulation in EGS Explained

The effectiveness of EGS hinges on increasing the permeability of rock formations deep underground. This is accomplished through hydraulic stimulation, a process that involves injecting water at high pressures into the rock via a well. The pressure opens and extends pre-existing fractures within the rock, thereby enhancing its permeability. This technique, known as hydro-shearing, differs from hydraulic fracturing in the oil and gas industry, which often creates new fractures. In EGS, the expanded fractures enable water to flow, absorb underground heat, and then be pumped back to the surface as heated water, which is then used to generate electricity.

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00

EGS vs. Natural Geothermal Resources

EGS extends geothermal power beyond natural hydrothermal areas by creating/enhancing permeability in hot dry rock.

01

EGS Heat Extraction Method

EGS uses hydraulic stimulation to access thermal energy in Earth's crust where natural water/permeable rock lack.

02

EGS Impact on Geothermal Development

EGS broadens geothermal energy potential geographically, allowing exploitation in diverse locations.

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