A solid oxide fuel cell (SOFC) in which (Ba0.3Sr0.2La0.5)InO2.75 was used as an electrolyte was fabricated in order to characterize its electrical power generation. Moistened 1% hydrogen gas balanced with argon gas was used as the fuel gas to prevent reduction of the electrolyte. The chemical reaction between the electrolyte and some electrode materials has been investigated by X-ray diffraction. The appropriate electrodes are Pt and Ni for the cathode and anode, respectively. The maximum power density was 0.51 (W/cm(2)) at 800 degreesC. (C) 2004 Elsevier B.V. All rights reserved.