TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: A combustion opening of the fuel material is disposed in a bottom section of the combustion chamber. A lower end section of the combustion chamber is provided with an air supplying opening (18) capable of contributing combustion of the fuel material and capable of conducting intake of air to be supplied to the anode layer. The wall of combustion chamber further comprises air-introducing perforation(s) or slit(s). The combustion chamber further comprises an air-supplying mechanism for introducing air into the combustion chamber. The cell units are in the form of a single cell member comprising the substrate of solid electrolyte, the anode layer and the cathode layer. The cell units may be formed from a combination of at least two partitioned cell members disposed in lengthwise and/or crosswise directions. Each cell member comprises the substrate of solid electrolyte, the anode layer and the cathode layer. The cell members are electrically connected in series or in parallel. The anode and cathode layers are connected in series in adjacent cell members.A common substrate of solid electrolyte is contained in adjacent cell members, and an anode layer of one cell member is electrically connected in series through a conductor via, applied in full thickness of the common substrate, to a cathode layer of adjacent cell member. An anode layer of one cell member may be electrically connected in series through a conductor wire, extended and passed through a via-hole of the common substrate, to a cathode layer of adjacent cell member. An anode-sided metal mesh embedded or secured in an anode layer of one cell member is electrically connected in series through a conductor wire, extended and passed through a gap between the adjacent cell members, to a cathode-sided metal mesh embedded or secured in a cathode layer of adjacent cell member. An anode-sided metal mesh embedded or secured in an anode layer of one cell member is electrically connected in series through a connecting metal mesh, extended and passed through a gap between the adjacent cell members, to a cathode-sided metal mesh embedded or secured in a cathode layer of adjacent cell member. The connecting metal mesh is either the anode-sided metal mesh or the cathode-sided metal mesh.The fuel cell is a combination of at least two fuel cell structures (B1-B3), each capable of acting as a fuel cell. A group of the fuel cell structures is contained in a casing.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Materials: The gaseous fuel material comprises a gas or gas mixture generated from hydrocarbon gas, gasoline, alcohol, and ketone.