(averaged to 0.92 GJ t -1 CO2 in Figure ) to sustain sufficient gas to liquid mass transfer rates of H2 . Solubilizing CO2 in the MDEA will potentially reduce costs for stirring because it allows for higher H2 partial pressures than when CO2 is mixed into the gas as it would for conventional scrubbing and release. The biomethanation of H2 (21.98 GJ t -1 CO2) and CO2 into CH4 (18.23 GJ t -1 CO2) possess an energy efficiency of 79.61%LHV due to mainly stirring requirements and the exothermic nature of biomethanation reaction, where 3.75 GJ t -1 CO2 energy are lost as low-grade heat. The produced CH4 can be stored in the gas grid infrastructure, recycled back to the combustion engine producing the flue gas or used as a platform chemical. The energy consumption analysis emphasized that the major energy consumptions originate from the utilization stage of the process chain, which contributes to an energy consumption of 15.67 GJ t -1 CO2. Of these, the energy requirements were 70.20% dominated by energy expenses for H2 production in the alkaline electrolyzer. Further expansion of the renewable energy sources therefore remains a prerequisite for the development of an industrially relevant system, where power to X is integrated as a utilization method. For the entire CCU process chain with conventional CO2 capture with amine scrubbing followed by utilization with biomethanation represented a total energy consumption of 19.36 GJ t -1 CO2, whereas the total energy consumption for the CCU process chain of carbon capture with amines and microbial mediated CO2 stripping and conversion constituted 15.80 GJ t -1 CO2. However, concurrently with the rapid technological development within the PtX and CCU fields, the performance metrics of many of the technologies are expected to be improved, and the absolute energy demands are therefore expected to be reduced drastically in the future, which provides a more profitable system analysis.