Biomethane
What is Biomethane?
Biomethane is a renewable gas produced by upgrading biogas to remove carbon dioxide, water vapour and impurities, resulting in a high-purity methane fuel that is chemically similar to natural gas.
It is typically generated from agricultural feedstocks such as manure, slurry, crop residues and food waste through anaerobic digestion, before being refined to grid-quality standards.
In agriculture, biomethane represents the advanced stage of farm-based renewable energy production — transforming organic waste into a low-carbon gas suitable for national energy networks, heating systems and transport fuel.
Biomethane plays a central role in decarbonising rural energy systems and supporting Net Zero farming strategies.
How Biomethane Is Produced
Biomethane production involves two main stages:
1. Anaerobic Digestion
Organic material is broken down without oxygen to produce biogas (a mix of methane and carbon dioxide).
2. Gas Upgrading
The raw biogas is purified through upgrading technologies such as:
Pressure swing adsorption (PSA)
Water scrubbing
Membrane separation
Chemical scrubbing
This removes CO₂ and other trace gases, increasing methane concentration to around 95–99%.
The resulting biomethane can then be:
Injected into national gas grids
Compressed for vehicle fuel (bio-CNG)
Used for on-site energy applications
Why Biomethane Matters in Agriculture
Carbon Reduction - Biomethane replaces fossil natural gas, reducing greenhouse gas emissions.
Circular Resource Use - Transforms agricultural waste into high-value energy.
Farm Income Diversification - Grid injection and renewable gas sales create new revenue streams.
Nutrient Recycling - Digestate by-product supports soil fertility and nutrient cycling.
Policy Alignment - Supports UK and EU renewable energy targets and climate commitments.
Biomethane in the UK
The UK is one of Europe’s leading biomethane producers, driven by:
Renewable energy incentives
Biomethane grid injection schemes
Net Zero 2050 commitments
Agricultural decarbonisation strategies
Growth in farm-based anaerobic digestion
Many UK dairy and mixed farms now operate AD plants specifically designed for biomethane export to the gas grid.
Biomethane is increasingly recognised as a key contributor to rural energy transition.
Biomethane in Europe, USA & Globally
Europe
Countries such as Germany, Denmark and France have heavily invested in biomethane under the Renewable Energy Directive and energy independence strategies.
United States
The USDA and Environmental Protection Agency (EPA) support renewable natural gas (RNG) development, particularly in the dairy and livestock sectors.
Global
The International Renewable Energy Agency (IRENA), FAO and World Bank promote biomethane as a scalable solution for reducing methane emissions and supporting sustainable rural energy.
Biomethane vs Biogas
Feature | Biomethane | Biogas |
|---|---|---|
Methane Content | 95–99% | 50–70% |
Processing | Upgraded and purified | Raw gas from digestion |
Grid Injection | Yes | No (without upgrading) |
Use | Gas grid, transport fuel, heating | On-site electricity & heat |
Energy Quality | Comparable to natural gas | Lower energy density |
Biogas is the raw product of digestion.
Biomethane is the refined, grid-ready renewable gas.
Biomethane vs Natural Gas
Feature | Biomethane | Natural Gas |
|---|---|---|
Source | Organic waste | Fossil fuel extraction |
Carbon Footprint | Low / renewable | High / non-renewable |
Chemical Composition | Methane (renewable) | Methane (fossil-derived) |
Sustainability | Supports circular economy | Finite resource |
Biomethane is chemically similar to natural gas — but renewable.
Related Terms
Renewable Energy
Carbon Farming
Frequently Asked Questions (FAQs) on Biomethane
What is biomethane in simple terms?
Biomethane is purified biogas upgraded to natural gas quality, allowing it to be used for heating, electricity and vehicle fuel.
Is biomethane renewable?
Yes. Biomethane is produced from organic waste through anaerobic digestion, making it a renewable energy source.
What is the difference between biomethane and biogas?
Biogas is the raw gas produced during anaerobic digestion, while biomethane is upgraded biogas refined to a higher methane concentration.
Can biomethane be used in homes?
Yes. When injected into gas grids, biomethane can be used in domestic heating systems just like conventional natural gas.
Does biomethane help achieve Net Zero?
Yes. By replacing fossil gas and capturing methane emissions, biomethane significantly reduces greenhouse gas output.
Is biomethane profitable for farms?
Profitability depends on scale, feedstock supply and market incentives, but many farms benefit from long-term energy contracts and diversified income.
Key Resources on Biomethane
Learn the meaning of more essential agricultural terms with our easy-to-use Key Terms Glossary here
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