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Power plants are prime candidates to apply CO₂ capture for final storage as a mitigation option for climate change. Many CO₂ capture concepts make use of a sorption−desorption cycle to separate CO₂ from flue gas or O₂ from air. These include commercial absorption processes, as well as processes using new sorbent formulations, adsorption, and high-temperature chemical looping cycles for CO₂ and O₂. All of these new processes must confront the large scale of carbon flows typical in a power plant. In this work, a common mass balance for all of these processes is used to define a parameter that highlights the minimum sorbent performance required to keep sorbent makeup costs at an acceptable level. A well-established reference system for which reliable commercial data exist (absorption with monoethanolamine, MEA) is used as a technoeconomic baseline to show that some of the sorbents being proposed …