EXOELECTROGENS ARE ORGANISMS WHICH CAN RECEIVE ELECTRONS FROM DONARS AND CAN EXPORT ELECTRONS OUTSIDE THE CELL OR CELLS THE ELECTRONS PRODUCED DURING PHOTOSYNTHESIS OR RESPIRATION AVAILABLE TO THEM CAN BE PASSED ON TO ELCTRON ACCEPTORS VIA ELECTRODES AND DURING THE PROCESS ELECTRICITY GETS GENERATED IN THE CIRCUIT . THE CHALLENGE IS TO EXTRACT ELECTRONS AND USE THEM FOR POWER GENERATION AS WELL AS SIMULTANEOUSLY CLEAN POLLUTED WATER AND PRODUCE HYDROGEN ETC AND OTHER BY PRODUCTS .