Biomethane production process consists of several stages:

1. Anaerobic digestion – organic raw materials (substrates) such as agricultural and food waste, manure or sewage sludge are fed into bioreactors.  Under anaerobic conditions, microorganisms break down the organic matter, producing biogas containing, among others, methane and carbon dioxide.
2. Biogas purification  – raw biogas contains approx. 50-70% methane as well as admixtures of other gases. The purification process involves removing undesirable compounds such as carbon dioxide and hydrogen sulphide.  Biogas is also dried to remove water vapour, and biomethane is ready. 
3. Transport and use – biomethane can be injected directly into the gas network. After compression to bioCNG or its liquefaction to bioLNG, it can also be transported by road or rail. Depending on the demand and the form of transport, it can be used in various sectors of the economy, including energy generation and transport. 

Biogas:

• Produced by the anaerobic digestion of organic matter.
• Consists mainly of methane (50-70%) and carbon dioxide (30-50%), but also contains trace amounts of hydrogen sulphide, water vapour and other impurities.
• Primarily used locally, usually in cogeneration plants that produce electricity and heat. 

Biomethane:

• Refined biogas with CO₂ and other compounds removed to produce a gas with a high methane content and natural gas quality.
• With biomethane parameters compliant with natural gas quality requirements, it can be injected directly into the existing gas network.  This means that energy can be transported on a regional, national and even international scale – to places where it is actually needed. 
• Can be used even at a considerable distance from its production site, which allows for more efficient use of renewable fuel. Biomethane can be certified as a renewable fuel and its green origin is increasingly valued by industry and the transport sector.
• It aligns perfectly with the objectives of the EU climate policy, including the RED II Directive and the Fit for 55 package.  Its production and consumption support reduction of emissions in hard-to-decarbonise sectors, such as heavy-duty transport and chemical industry.

The development of biogas plants is an important step, but their full potential will only be unlocked by upgrading them to biomethane production. Only this will bring green energy closer a larger number of consumers, not only locally but also nationally and internationally. 

At a time when we are pursuing climate neutrality and independence from imported natural gas, biomethane is becoming a strategically important fuel for Europe. It is a renewable, local and flexible source of energy, perfectly aligned with the principles of green transition.

In the era of the energy transition and the search for low-carbon energy sources, biomethane is playing an increasingly important role, opening new opportunities for industry as well as transport and energy sectors.

Biomethane provides a number of benefits:

• Reduction of greenhouse gas emissions – the use of biomethane can contribute to emission reductions, as it is a renewable fuel produced from organic matter.
• Waste utilisation – biomethane production allows effective management of organic waste, contributing to a circular economy.
• Energy independence – the use of local raw materials for biomethane production reduces dependence on fossil fuel imports.
• Compatibility with the existing infrastructure – biomethane can be used in the existing gas installations which facilitates its integration and reduces implementation costs.

Biomethane potential in Poland:
According to data from the Ministry of Climate and Environment, the potential for biomethane production in Poland is approx. 8 bcm/y. Considering that the domestic demand for natural gas fluctuates between 18 and 20 bcm/y, biomethane could satisfy part of it, contributing to energy security and achieving climate objectives.

The large-scale use of biomethane will require transport to customers spread over different locations. Read more how biomethane plants can be connected to the GAZ-SYSTEM transmission network.