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The aim of the present study is to assess the techno-economic viability of integrating biomethanation into power to gas systems in a real waste water treatment plant (WWTP). The research is the first attempt to assess the viability of several scenarios based on the biomethanation technology that include both in- and ex-situ biomethanation as well as utilisation of on-site renewable electricity and grid electricity in a transient mode.

Five scenarios were designed and evaluated and the calculated LCOE lies between 127.8 and 159.8 £/MWh. The consideration of existing policy mechanisms and revenues from by-products reduces the LCOEs to 31.4–68.1 £/MWh. The execution of a sensitivity analysis exposed that the electricity price and the electrolyser cost are the main cost contributors in all the scenarios. Future techno-economic advances along with imposing appropriate policy incentives can create the proper …