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In page Solid oxide fuel cell:

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Theoretically, the combination of the SOFC and gas turbine can result in high overall (electrical and thermal) efficiency.[2]. Such systems have been evaluated by Siemens Westinghouse and Rolls-Royce as a means to achieve higher operating efficiencies by running the SOFC under pressure. SOFC-GT systems typically include anodic and/or cathodic atmosphere recirculation, thus increasing efficiency.[citation needed]