Techno-Economic Evaluation of Biological and Fluidised-Bed Based Methanation Process Chains for Grid-Ready Biomethane Production

Three different power-to-methane process chains with grid injection in two scales (1 MW el and 6 ) were analysed regarding their investment operation cost. The based on biological or catalytic bubbling fluidised bed methanation combination proton exchange membrane solid oxide electrolyser cells. A bottom-up techno-economic analysis showed a cost benefit of around 17–19% lower biomethane production for the technology as less than third reactor volumes is required methanation. This only given PEM electrolysis, high-temperature stacks currently result high Based electricity 5 €-ct/kWh plant size , 13.95 €-ct./kWh 17.30 could be obtained, both including electrolysis. significant efficiency increase by integrating heat reaction electrolysis can achieved; however have to decrease below 1000 €/kW obtain economically feasible biomethane. Under current economic technological circumstances, CO 2 using most effective.