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Probabilistic Estimation of Levelized Cost of Electricity from Using Geologically Stored CO2 for Geothermal Energy Production

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Abstract: The use of geologically stored CO2 as a geothermal heat extraction fluid can take advantage of the beneficial thermophysical characteristics of CO2 that can render it a more effective heat extraction fluid than the brine that exists in the aquifers. Some of these characteristics include a higher mobility (inverse kinematic viscosity) in reservoir conditions and a highly temperature-dependent density that can result in a naturally self-convecting thermosiphon between injection and production wells. This thermosiphon may reduce or eliminate the need for subsurface pumps—and the associated parasitic pumping power—for fluid circulation. Part of the utility of such a CO2 capture, utilization, and storage (CCUS) system is the possibility to generate baseload or dispatchable electricity with levelized costs of electricity (LCOEs) that are on par with the LCOEs of other energy technologies of regional electricity systems.

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