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CO₂ methanation, also known as the Sabatier process, affords methane by the exothermic reaction of CO₂ with H₂. The commercial methanation of CO₂ is performed at 300–550 °C and above 5 bar. Most CO₂ methanation processes are considered to be a linear combination of rWGS and CO methanation. The process is expected to be a power‐to‐gas concept for converting renewable electrical energy into methane as chemical energy. In other words, the main goal of methanation is the intermediate storage of renewable electricity in methane as an energy carrier. Since fossil‐based natural gas is a common fuel, there would be easy access to existing infrastructure.

Due to the significant interest in CO₂ methanation, the first pilot plant capable of producing 0.5 Nm³ h⁻¹ of synthetic natural gas was built in Japan [25]. In terms of commercial installations, Audi has an operational CO₂ methanation facility (max. 325 Nm³ h⁻¹) using renewable H₂ (max. 1300 Nm³ h⁻¹) from electrolysis (max. 6.0 MW) in Germany [26, 27].