Which statement best defines synthetic natural gas (SNG) produced from power-to-gas?

• A. Gasoline refined from biomass.
• B. Pure methane extracted from fossil reserves without synthesis.
• C. Methane produced from hydrogen and CO2 via methanation or similar processes to inject into natural gas networks for storage and use.
• D. Hydrogen gas injected into pipelines instead of methane.

Answer: (C)

Power-to-gas stores renewable energy by turning excess electricity into a storable chemical fuel. In this approach, electricity splits water to make hydrogen, CO2 is combined with that hydrogen in a methanation step, and methane (CH4) is produced. This methane, a form of synthetic natural gas, can be injected into existing natural gas networks and stored in the gas grid for later use, making it compatible with current infrastructure and enabling long-duration energy storage. That’s why the statement describing methane produced from hydrogen and CO2 via methanation (or similar processes) for injection into natural gas networks is the best fit.

The other options don’t capture this process: gasoline refined from biomass is a biofuel, not SNG; pure methane from fossil reserves without synthesis is natural gas, not synthetic; hydrogen injected into pipelines refers to hydrogen itself rather than a methane-based fuel compatible with gas networks.