Process simulation and energy analysis of synthetic natural gas production from water electrolysis and CO2 capture in a waste incinerator

•Analysis of the reuse of CO2 from a waste incinerator in a power-to-gas system.•Different carbon capture and electrolysis technologies are considered.•Detailed modelling of all sections of the power-to-gas system is performed.•KPIs are presented to investigate the energy and environmental performance.•A comparative assessment of the different power-to-gas configurations is provided.