Smart energy systems

Wind power to gas

Instead of allowing overproduction of wind power to go to waste, it can generate hydrogen gas from water using electrolysis. The green hydrogen gas can be used directly as a fuel or it can be used to increase the exchange of biomethane in conjunction with biogas production. In brief, the process is as follows:

  • When biogas is produced, large volumes of carbon dioxide are generated.
  • Hydrogen gas is produced through electrolysis from water with the aid of surplus wind power that cannot be stored.
  • If the carbon dioxide from biogas production reacts with the hydrogen gas produced by the surplus from wind power, biomethane is formed, i.e. biogas, which is stored and distributed in the gas grid. The process also produces heat, which is added to the district heating grid.
Utilising temporary surpluses from wind power where it is generated and by transforming the electricity into biogas in the nearest regional gas grid would pave the way for even greater expansion of the wind power network. At the same time, the exchange of biogas from existing biomass is doubled. As carbon dioxide is needed in the Power to Gas process, the carbon dioxide that arises in biogas production can be utilised. By doing so, a greater volume of biogas is extracted from the same volume of raw materials.

In an energy system where production of biogas and wind power can be integrated with the gas grid, there is greater potential for companies and the transport sector to gain access to renewable energy. 

Through increased hydrogen and biogas production, Power to Gas can contribute to achieving the target of fossil independence and fossil-free transport.