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An intermediate temperature solid oxide fuel cell ͑SOFC͒ module was developed using electrochemically active cells composed of (La, Sr͒͑Ga, Mg, Co͒O 3 electrolyte, Ni-͑Ce, Sm͒O 2 anode, and (Sm, Sr͒CoO 3 cathode. Seal-less planar type stack design was employed. The first generation module successfully provided the output power of 1 kW with thermal self-sustainability below 800°C. Maximum electrical efficiency obtained with this module was 43%͓LHV͔ together with the corresponding fuel utilization of 78%. Dynamic performance tests demonstrated the capability of output power alteration from 0.6 to 1 kW while maintaining a high electrical conversion efficiency. Further testing and modification of the module for methane fuel utilization are in progress.

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