A novel green hydrogen production using water-energy nexus framework

•A novel system for hydrogen production from flue gas of different power plants using solid oxide electrolytic cell (SOEC) is designed.•Model validation and performance analysis for the SOEC and the system are performed.•Detailed techno-economic analysis of the system is carried out.•A comparative evaluation of solar PV, coal and other energy feedstock for levelized cost of hydrogen (LCOH) shows LCOH of $2.99/kg H2 or lower is achievable.