Power-to-gas through CO2 methanation: Assessment of the carbon balance regarding EU directives

摘要: Abstract The transformation of carbon dioxide (CO2) into fuels is receiving a growing attention from engineers, scientists and policy makers. For instance, CO2 hydrogen produced with renewable electricity can be combined to provide methane (power-to-gas). This strategy could store temporary surpluses electricity, but the lack accurate balance makes it difficult establish regulatory status final product, particularly when derived fossil resources. article describes an adapted methodology assessing power-to-gas. emissions greenhouse gases per unit energy have been calculated for different scenarios, varying source origin dioxide. allows accounting contained in initial fuel that provides When industrial process (e.g. cement industry), content product has estimated accounted for. results demonstrate power-to-gas should use as much possible. Biogenic atmospheric are most interesting sources, utilization sense given situations. Results also suggest current EU directives on not perfectly suited