The power-to-methane technology to store energy
The electricity produced by renewable energies is intermittent and needs to be stored. Power-to-gas is the most suitable solution for inter-seasonal storage. Excess production in summer is converted into gas and stored for the winter when consumption is higher.
Power-to-gas is often associated with the production of hydrogen via the water electrolysis. Hydrogen is a more dangerous gas than city gas and requires appropriate metallurgy.
Power-to-methane is a variant of power-to-gas that uses hydrogen produced initially by associating it with CO2 to form methane. Methane is easier to use and reduces the volume of gas to be stored (4H2 > 1CH4).
The Power-to-methane strength
The electricity storage by power-to-methane allows to recycle CO2 captured or emitted by an industrial or biogas plant.
High capacity storage
Batteries or hydroelectric dams have limited capacity for energy storage. They are suitable for short daily cycles.
Power-to-methane can store large amounts of energy. It is particularly suitable for long inter-seasonal cycles.
Injection into the existing gas network
The power-to-methane allows to use the existing gas network without modification of metallurgy or standard.
The storage is carried out in the geological reservoirs already used for the supply of natural gas.