Exoelectrogens are living beings which are enabled to generate electricity directly or indirectly .by use of appropriate technology These organisms which produce bioelectricity (or green energy so to say) include Archaea , bacteria , Algae ,Fungi ,plants and animals . This bilingual book by SK Bhatnagar ( Santosh ' Ratan') includes some interesting examples ; news about latest technology and the latest addition to ever growing list of exoelectrogens .