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Closed-loop and hybrid closed-loop systems (geothermal)


Technology Description

Closed-loop geothermal systems cover a range of new, closed or partially closed-loop (hybrid) technology trials for power generation. These trials largely rely on thermal conduction in rock (a poor conductor) along long wellbores and often rely on the use of supercritical CO2 or other new working fluids. CLGS allows for applications in low-temperature sedimentary resources with from about 100 °C to 180 °C. This allows expansion of geothermal from a limited conventional geothermal supply into sedimentary basins leading to a growth in geothermal supply of several magnitudes and locations.

Relevance for Net Zero

Enables the use of low-temperature, sedimentary heat sources allowing for significant extension for geothermal resources globally and translation of oil and gas innovation and expertise. Additionally, aids the growth of closed-loop or hybrid closed-loop systems. This reduces the complexity of subsurface interactions by avoiding the reduction of subsurface pressure and geochemical interactions and improves heat transfer efficiencies.

Key Countries

United States, Germany, Canada, United Kingdom

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