text: The mechanism of electromethanogenesis is outlined in Figure 1. Water is introduced into the system with the anode, biocathode, and microbes. At the anode, microbes attract HO molecules which are then oxidized after an electrical current is turned on from the power source. Oxygen is released from the anode side. The protons and electrons oxidized from the HO move across the membrane where they move into the material that makes up the biocathode. The new microbe on the biocathode has the ability to transfer the new electrons from the biocathode material and convert them into protons. These protons are then used in the major pathway that drives methane production in electromethanogenesis—CO reduction. CO is brought in on the biocathode side of the system where it is reduced by the protons produced by the microorganisms to yield HO and methane (CH). Methane is produced and can then be released from the biocathode side and stored.