CasthouseCasthouse decarbonizationDecarbonization is an important pillar in the aluminiumAluminium industry’s effort to reach zero carbon emissionsCarbon emissions. Conventional gas-fired burners, typically used in casthousesCasthouse, are the primary source of carbon emissionsCarbon emissions in the casthouseCasthouse. In recent years, several stakeholders in the industry have been evaluating retrofittable solutions, such as replacing natural gas with hydrogenHydrogen or even substituting traditional burners with plasma torchesPlasma torch, to reduce carbon emissionsCarbon emissions. While small-scale experimental trials have been conducted by various groups to compare burner technologies, industrial scale evaluations remain very limited. In this article, we use validated numerical tools to compare different burners at industrial scale: cold air burner (natural gas and hydrogenHydrogen), oxy-fuel burner (hydrogenHydrogen), and plasma torchPlasma torch (high and low enthalpy). This can provide a framework for detailed comparison between different technologies and support the industry in their efforts to reduce carbonCarbon dioxide emissionsEmissions.