A BaZr_0.1Ce_0.7Y_0.1Yb_0.1O_3-δ (BCZYYb) infiltrated Ni-YSZ anode was investigated for biogas conversion. The infiltration of BCZYYb significantly promoted the electrochemical reactions and the cells exhibited high power output at the operational temperatures over 750 °C. At 800 °C, supplied with 20 ml min^-1 biogas, the cell with a BCZYYb-Ni-YSZ anode, generated 1.69 A cm^-2 at 0.8 V with an optimal amount of 0.6 wt% BCZYYb, whereas only 0.65 A cm^-2 was produced with a non-infiltrated Ni-YSZ in the same conditions. At 750 °C, a maximum power density of 1.43 W cm^-2 was achieved on a cell with a BCZYYb-Ni-YSZ anode, a 3 µm dense YSZ film electrolyte, a Gd_0.1Ce_0.9O₂ (GDC) buffer layer and a La_0.8Sr_0.2Co_0.8Fe_0.2O₃-Gd_0.1Ce_0.9O₂ (LSCF-GDC) composite cathode. The cell remained stable, while operating at 0.8 V for 50 hours with a current density of 1.25 A cm^-2. A well-designed cell structure and selected components made it possible to obtain excellent performance at good fuel utilisation. The analysis of gases in open-circuit conditions or under various current loads suggested that the prevalent reaction was reforming of methane without coking. This study demonstrated that BCZYYb-Ni-YSZ is a promising electrode for carbon-containing fuels.