NOVELTY - The microbial fuel cell useful in wastewater treatment, comprises an anode, a cathode, an electrically conductive connector connecting the anode and the cathode, a housing for an aqueous medium, and a solid form of a biodegradable organic substrate disposed in the aqueous medium. A portion of the package is electron conductive and forms a portion of an anode. The aqueous medium contacts with a portion of the anode. The solid form of a biodegradable organic substrate is characterized by a total surface area selected to support electron generation.    USE - The microbial fuel cell is useful in various applications such as wastewater treatment and renewable energy production.    ADVANTAGE - The fuel cell produces electricity and/or hydrogen to power a portable electronic device and remote device e.g. marine sensor or power supply station for sensors, is electrically conductive, and has a solid material metabolizable by bacteria.    DETAILED DESCRIPTION - The microbial fuel cell useful in wastewater treatment, comprises an anode, a cathode, an electrically conductive connector connecting the anode and the cathode, a housing for an aqueous medium, and a solid form of a biodegradable organic substrate disposed in the aqueous medium. A portion of the package is electron conductive and forms a portion of an anode. The aqueous medium contacts with a portion of the anode. The solid form of a biodegradable organic substrate is characterized by a total surface area selected to support electron generation and transfers to the anode by anodophilic bacteria over a selected minimum period of time. The aqueous medium comprises a dissolved biodegradable organic substrate. The solid form comprises one or more particles, each of the one or more particles having a particle surface area. The total surface area is the sum of the particle surface area of the one or more particles. An INDEPENDENT CLAIM is included for an electrode for a microbial fuel cell.    DESCRIPTION OF DRAWING(S) - The diagram shows a microbial fuel cell.    Anodophilic bacteria (103)    Anode (112)    Cathode (116)    Electron (117)    Channel. (122)