CO2-negative fuel production using low-CO2 electricity: Syngas from a combination of methane pyrolysis and dry reforming with techno-economic analysis

•Combining methane pyrolysis and CO2 reforming results in a net-CO2-negative process.•Activation energy was 187 kJ/mol for pyrolysis and 99 kJ/mol for dry reforming.•The lowest syngas price was when an electric reactor is used at <$0.029/kWh.•The most affordable syngas results when carbon abatement cost is over $104/t.•Levelized CO2 mitigation costs is $60/t compared to the best base case.