In bioelectromethanogenesis, electricity can be converted to methane, partially indirect via electro-chemical hydrogen production, partially via direct electron transfer to the electroactive methanogens. The electron transfer mechanism from electrode to methanogens was not fully understood so far. Using a pure culture of Methanococcus maripaludis, we show that the ratio between direct and indirect electron transfer is shifted by altering the process conditions. The largest shift from 95.6% direct to 42.0% indirect electron transfer occurred when reducing the working potential. Further influences were observed by addition of 3-(N-morpholino) propanesulfonic acid buffer and alteration of electrode material, but not by alteration of the in-gas composition and gas velocity. In all cases, abiotically produced hydrogen was converted at a high rate of above 75%. This research shows that the electron uptake pathway in bioelectromethanogenesis can be influenced without genetic modifications, offering new possibilities for the examination of the mechanistic behind electroactivity. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.