Biological photovoltaics (BPV) is an energy-generating technology which uses oxygenic photoautotrophic organisms, or fractions thereof, to harvest light energy and produce electrical power.[1] Biological photovoltaic devices are a type of biological electrochemical system, or microbial fuel cell, and are sometimes also called photo-microbial fuel cells or “living solar cells”.[2] In a biological photovoltaic system, electrons generated by photolysis of water are transferred to an anode.[3] A relatively high-potential reaction takes place at the cathode, and the resulting potential difference drives current through an external circuit to do useful work.