As already mentioned in part I bioelectromethanogenesis is a power to gas technology that is used to convert electrical power to chemical energy carriers. In this case carbon dioxide is converted to methane by electroactive microorganisms. Part I of this study reviewed the theoretical energetic demand and showed the general reaction process. This part observes the technology's environmental impact by regarding the global warming potential (GWP). According to the contemplated purpose of the reviewed technology there is a comparison to common biogas upgrading techniques.