Methane is widely used to supply energy needs globally and so an expensive methane gas infrastructure has been built up. Using renewable electricity to produce hydrogen and combining it with CO₂ (captured from the atmosphere) allows for producing CH4 or renewable methane. This process called Power-to-Gas is considered to have huge potential in providing carbon-neutral fuels for heating, industry, and transport.
Advantages: The current natural gas infrastructure can be used. Seasonal storage is possible. Hydrogen is highly scalable.