What are the advantages of biogas? The ten principal benefits are renewable energy production, reduced dependence on fossil fuels, better management of organic waste, potential greenhouse gas reductions, nutrient recycling, local energy security, flexible energy use, rural employment, improved sanitation and opportunities for a more circular economy.
Biogas is unusual among renewable energy sources because it can provide useful fuel while treating biodegradable materials that might otherwise cause pollution. However, the benefits are not automatic. They depend on suitable feedstocks, sound engineering, careful operation, methane emissions control and responsible use of the digestate remaining after digestion.
This updated guide explains the 10 advantages of biogas, the technical qualifications behind them and the disadvantages that project developers should consider.
Key Takeaways: 10 Advantages of Biogas
- Renewable energy: Biogas converts biodegradable materials into a combustible gas that can provide heat and power.
- Reduced fossil fuel use: Biogas or upgraded biomethane can displace natural gas and other conventional fuels.
- Organic waste treatment: Anaerobic digestion provides a controlled treatment route for suitable food wastes, slurries and organic residues.
- Potential greenhouse gas savings: Capturing methane that might otherwise escape can deliver substantial climate benefits, provided emissions from the biogas system are controlled.
- Nutrient recycling: Digestate retains much of the feedstock’s nitrogen, phosphorus and potassium for potential agricultural use.
- Local energy security: Biogas can provide locally produced fuel instead of relying entirely on imported energy.
- Flexible energy production: Stored biogas can support heat generation, combined heat and power (CHP), or upgrading to biomethane.
- Rural economic development: Biogas projects can support farm diversification, skilled employment and local supply chains.
- Improved sanitation: Appropriately designed domestic or community digesters can contribute to better management of animal and human wastes.
- Circular economy benefits: The same process can produce useful energy while recovering nutrients from organic materials.
Important qualification: These are potential benefits, not guarantees for every biogas plant. Environmental performance must be assessed against the likely alternative treatment or energy supply arrangement.
What Is Biogas and How Is It Produced?
Biogas is produced when microorganisms break down biodegradable organic matter in the absence of oxygen. This biological process is called anaerobic digestion (AD).
Suitable feedstocks include livestock manure, food processing residues, source-separated food waste, sewage sludge and some agricultural crops or crop residues.
Biogas consists mainly of methane (CH4) and carbon dioxide (CO2), together with smaller quantities of gases and vapours including hydrogen sulphide and water vapour. The International Energy Agency reports a typical methane content of approximately 45–75% by volume, depending on feedstock and production conditions.
Source: IEA – Introduction to Biogas and Biomethane.
The methane is the main combustible component. Raw biogas may be cleaned and used as fuel in appropriately designed equipment, or upgraded by removing much of the carbon dioxide and other impurities to produce biomethane.
Biomethane can meet specifications for injection into suitable natural gas networks or for use as a compressed vehicle fuel.
For a more detailed introduction, see our What Is Biogas? guide.
1. Biogas Produces Renewable Energy
The most immediately recognisable advantage of biogas is that it provides useful energy from recently grown organic matter and biodegradable waste materials.
Unlike fossil natural gas, which contains carbon accumulated underground over geological periods, sustainably produced biogas uses carbon circulating through the contemporary biological carbon cycle.
Raw biogas can be used for:
- Cooking and water heating in suitably designed domestic or community systems.
- Boilers producing heat for buildings or industrial processes.
- Gas engines generating electricity.
- Combined heat and power installations supplying electricity and useful heat.
- Upgrading to biomethane for gas grid injection or transport applications.
Each application needs appropriate gas cleaning, combustion equipment and safety controls. Raw biogas is not a direct substitute for natural gas in ordinary appliances without checking gas quality and equipment suitability.
For industries with a continuous heat requirement, using biogas to replace fossil fuel in an appropriately designed boiler may offer an attractive application.
2. Biogas Can Reduce Dependence on Fossil Fuels
Where useful biogas energy replaces coal, heating oil, fossil natural gas or other conventional fuels, it can reduce demand for non-renewable resources.
The extent of the benefit depends on what fuel or energy supply is displaced. Replacing an inefficient coal-fired heat source can have a different environmental outcome from replacing electricity already supplied by a low-carbon grid.
Upgraded biomethane has particular value where gas infrastructure and gas-consuming equipment already exist, including industrial heat applications that are difficult to electrify.
Biogas therefore offers a practical route towards diversification of energy supply, but it should be considered alongside energy efficiency, electrification and other renewable technologies.
3. Anaerobic Digestion Helps Manage Organic Waste
Organic waste treatment is one of the strongest practical arguments for anaerobic digestion.
Livestock slurries, food waste and other readily biodegradable residues can cause environmental problems if they are improperly stored or disposed of.
A well-operated anaerobic digester provides a controlled process in which much of the readily degradable organic matter is converted into biogas.
Potential advantages include:
- Diverting suitable biodegradable waste from landfill.
- Reducing the readily biodegradable organic content of wastes.
- Providing a more controlled alternative to unmanaged decomposition.
- Creating opportunities for useful heat, electricity and fertiliser recovery.
- Integrating organic waste processing into existing agricultural and industrial operations.
Digestion does not eliminate waste completely. A substantial quantity of liquid and solid digestate remains and needs appropriate storage, handling, treatment or beneficial use.
Nor does digestion make unsuitable or contaminated waste automatically safe. Feedstock acceptance, contaminant control and hygiene standards are essential.
4. Biogas Can Reduce Greenhouse Gas Emissions
Climate change mitigation is potentially one of the most significant environmental advantages of biogas, particularly where it captures methane that would otherwise be released from manure storage or decomposing organic wastes.
Methane is a powerful greenhouse gas, so preventing its uncontrolled release can be environmentally valuable.
However, it is technically incorrect to describe all biogas production as automatically carbon-neutral or free from greenhouse gas emissions.
Why Methane Leakage Matters
Biogas plants can release methane through leaking pipes and valves, pressure relief devices, gas upgrading equipment, poorly managed storage tanks and uncovered digestate storage facilities.
In its 2025 Outlook for Biogas and Biomethane, the International Energy Agency reported evidence of methane emissions from biogas and biomethane plants in the range of approximately 2% to 5.5% of output. These figures illustrate an industry-wide emissions problem; they are not emission factors that should automatically be applied to every individual plant.
The IEA emphasises the importance of:
- Effective methane leak detection and repair.
- Appropriate gas-tight digester and digestate storage arrangements.
- Control or treatment of methane-containing upgrading off-gases.
- Correct management of operational and maintenance emissions.
- Ongoing monitoring and verification of environmental performance.
Source: IEA – Outlook for Biogas and Biomethane: Key Findings (2025).
Does Burning Biogas Release Carbon Dioxide?
Yes. Burning methane produces carbon dioxide and water. Biogenic CO2 is often accounted for separately from fossil CO2 in greenhouse gas inventories, but that does not make an entire biogas project automatically climate-neutral.
The lifecycle assessment should account for feedstock production, transport, plant operation, energy consumption, methane leakage, nitrous oxide emissions, digestate handling and the energy or waste-management processes being displaced.
For that reason, a properly managed manure-based biogas plant may deliver very substantial emissions savings, while an inefficient system with significant methane losses may perform much less favourably.
5. Digestate Can Recycle Valuable Plant Nutrients
Anaerobic digestion produces a residual material known as digestate. It contains water, residual organic matter, mineral constituents and nutrients derived from the original feedstocks.
Important nutrients include nitrogen, phosphorus and potassium. Where digestate is suitable for agricultural use, these nutrients may partially replace purchased mineral fertilisers.
Digestate may be used as whole digestate or separated into liquid and fibrous fractions. Separation can assist particular storage, transport or nutrient-management objectives, but does not remove the need for quality control.
Digestate Is Not Automatically Safe Fertiliser
The advantages of digestate depend on its chemical composition, biological quality, contaminants and the requirements of the receiving soil and crop.
Potential problems include:
- Ammonia emissions during storage and spreading.
- Nitrate leaching or phosphorus runoff from inappropriate application.
- Plastic fragments and other physical contaminants.
- Pathogens where treatment and hygiene controls are inadequate.
- Heavy metals or other unwanted substances introduced with feedstocks.
- Residual methane emissions from digestate storage.
In England, the Environment Agency’s Anaerobic Digestate Resource Framework, published in October 2025, describes the requirements for certain source-segregated biowaste digestates to achieve end-of-waste status. It refers to PAS 110 and additional conditions concerning feedstocks, processing, quality assurance, storage and intended use.
The framework applies specifically to England. Different rules may apply elsewhere, and non-qualifying digestate remains subject to the relevant waste-management controls.
Source: Environment Agency – Anaerobic Digestate Resource Framework.
See also our Biofertiliser Resource List and What Is Digestate?.
6. Biogas Improves Local Energy Security
Another advantage of biogas is that it can be produced near the places where feedstocks arise and energy is needed.
Farm digesters may supply electricity and heat to agricultural operations. Food processing plants can potentially use their own organic residues to help meet energy requirements. Wastewater treatment works may recover energy from sewage sludge.
Locally produced gas can reduce exposure to imported fuel requirements and provide an additional energy supply option.
However, energy independence should not be overstated. A digester may still need imported electricity, specialist maintenance, replacement components or supplementary feedstocks. The overall result depends on the project’s design and operating conditions.
7. Biogas Offers Flexible Energy Production and Storage
Unlike solar electricity and wind power, whose immediate output depends on weather conditions, a biogas plant can produce a relatively steady stream of fuel from continuously supplied feedstocks.
Gas storage can help decouple biogas production from its use, within the capacity and safety limits of the storage system.
This can make biogas useful for:
- Continuous heat supply.
- Combined heat and power generation.
- Electricity production during selected demand periods, where equipment and storage capacities permit.
- Supply of biomethane to an appropriate gas distribution network.
- Providing fuel to suitably equipped vehicles or industrial processes.
However, biogas generation cannot normally be switched on and off rapidly without affecting biological stability. Electricity dispatch flexibility is principally achieved by managing gas storage and generation equipment rather than by immediately changing the digestion rate.
Upgrading, compression and gas storage also incur capital, energy and operational costs.
8. Biogas Creates Opportunities for Rural Businesses and Employment
Biogas and anaerobic digestion projects can generate commercial activity beyond the sale of energy.
They may require construction workers, process engineers, electricians, mechanical technicians, waste logistics services, laboratory analysis, environmental monitoring and continuing operational support.
Farm-scale projects may diversify farm income through useful energy production, waste treatment services and better management of manure or other residues.
The financial advantages depend on project-specific economics. Important variables include:
- Capital and financing costs.
- Reliable access to suitable feedstocks.
- Electricity and gas connection requirements.
- Energy sale prices and on-site energy savings.
- Availability and conditions of any support scheme.
- Operational labour and maintenance requirements.
- Digestate storage, transport and utilisation costs.
- Compliance, permitting and insurance obligations.
A technically successful digester is not necessarily a financially viable investment. A realistic feasibility study is essential before committing capital.
For more detail, read our Anaerobic Digestion Costs guide.
9. Small Biogas Systems Can Support Sanitation and Cleaner Cooking
In areas where households rely on wood, charcoal or other smoky solid fuels, a properly designed biogas cooking system can reduce indoor smoke exposure and the need to collect traditional cooking fuels.
Domestic and community digesters can also provide a treatment stage for animal manure and, in specifically designed systems, certain human wastes.
These benefits may be particularly important in rural communities where commercial fuel supply and sanitation infrastructure are limited.
Benefits for Households and Communities
Potential benefits include cleaner cooking at the point of use, reduced dependence on gathered firewood, time savings, local skills development and improved waste containment.
However, health benefits depend on safe appliances, adequate ventilation, proper sanitation design, gas-tight construction and suitable handling of the digester outputs.
A digester does not automatically sterilise human waste. Pathogens may survive depending on treatment temperature, retention time and process conditions. Additional treatment may be necessary before effluent or digestate can be used safely.
Biogas is also flammable and may contain toxic hydrogen sulphide. Poorly constructed systems can create serious safety hazards. Domestic installations should follow applicable local technical and sanitation requirements.
10. Biogas Supports a Circular Economy
Biogas production combines two functions that are often managed separately: the recovery of energy and the recovery of useful materials from biodegradable feedstocks.
For example, an appropriately designed farm system can collect manure, produce biogas, recover electricity or heat and return suitable digestate nutrients to agricultural land.
In food processing, organic residues can potentially be diverted from disposal and converted into useful energy, while nutrients may be recovered for suitable applications.
The resulting circularity is strongest when:
- Genuine wastes and unavoidable residues are prioritised.
- Useful energy output is maximised without unnecessary process emissions.
- Digestate is used according to demonstrated soil and crop needs.
- Methane and ammonia emissions are effectively controlled.
- Water, land and transport impacts are properly assessed.
This combination of waste treatment, renewable energy and nutrient recycling helps explain why anaerobic digestion differs from renewable energy technologies that produce electricity alone.
Advantages and Disadvantages of Biogas: Comparison Table
To make a balanced decision, it is necessary to consider the advantages alongside the engineering and environmental limitations.
| Potential advantage | Associated disadvantage or limitation |
|---|---|
| Renewable heat and electricity | Plant construction, operation and maintenance can be expensive. |
| Replacement of fossil fuels | Actual greenhouse gas savings depend on lifecycle emissions and displaced energy sources. |
| Reduced uncontrolled methane emissions | Gas leakage, upgrading off-gas and digestate emissions can undermine climate benefits. |
| Treatment of organic wastes | Feedstock contamination, unsuitable wastes and biological instability require management. |
| Recovery of fertiliser nutrients | Digestate requires compliant storage, testing, management and appropriate agricultural use. |
| Locally produced energy | Reliable feedstock supplies, plant operation and connection infrastructure remain necessary. |
| Potential rural business income | Profitability depends on finance costs, operating expenditure, revenues and regulation. |
| Cleaner cooking and better waste management | Small systems require safe installation, correct operation and suitable sanitation controls. |
What Are the Main Disadvantages of Biogas?
The benefits of biogas should not obscure its practical disadvantages. An anaerobic digestion project may have significant upfront costs, require specialist expertise and operate under demanding environmental and safety conditions.
High Initial Capital Expenditure
Commercial digesters require civil engineering works, process tanks, pumping and mixing systems, gas handling equipment, controls, safety systems and often substantial feedstock and digestate storage facilities.
CHP generation, gas upgrading and grid connection can add considerably to the project cost.
Biological Process Sensitivity
Anaerobic digestion is a living biological process. Overloading, unsuitable feedstocks, excessive ammonia, toxic compounds, temperature changes or poor mixing can reduce gas production and potentially cause process failure.
Methane Leakage and Environmental Risks
Uncontrolled methane losses can significantly reduce greenhouse gas savings. Digestate spills, nutrient runoff, odours and ammonia emissions can also cause environmental harm.
Land and Feedstock Competition
Where energy crops are grown specifically for digestion, land-use changes, fertiliser requirements, irrigation, soil impacts and competition with other agricultural uses need assessment.
Using appropriate wastes and residues can avoid some of these concerns, but waste-derived feedstocks may create additional contamination and handling challenges.
Safety and Regulatory Obligations
Biogas installations may present flammable atmosphere, confined-space, hydrogen sulphide, asphyxiation and pressure-related hazards.
Commercial projects must assess applicable legislation, environmental permissions, hazardous-area requirements, operating procedures and emergency arrangements. The precise requirements vary by country and installation.
Advantages of Biogas in Different Countries
The benefits of biogas vary according to local energy systems, agricultural practices, waste-management infrastructure and regulatory conditions.
United Kingdom
UK biogas projects can provide renewable heat, electricity, waste treatment and, where upgraded gas meets relevant specifications, biomethane for gas grid injection.
Project viability is strongly affected by feedstock contracts, planning permission, environmental permits, energy connections and digestate management.
England’s digestate resource framework provides one example of why the quality of outputs must be considered alongside the benefits of energy recovery. Requirements in Scotland, Wales and Northern Ireland must be checked separately.
India
Household and agricultural biogas systems have applications in the treatment of cattle dung and other suitable biodegradable materials, producing gas for cooking and digestate for potential agricultural use.
Larger installations can also produce compressed biogas, subject to the necessary upgrading, quality assurance and infrastructure arrangements.
Local economics, water availability, feedstock supply and suitable maintenance support are particularly important when selecting a system.
African Rural Communities
Domestic and community digesters may reduce dependence on gathered fuelwood and support cleaner cooking where suitable livestock manure, water and technical support are available.
Projects must nevertheless be designed around real household demand, affordability, climate, maintenance skills and local sanitation requirements.
European Union and Other Developed Markets
Biogas and biomethane can contribute to waste-management, agricultural and renewable energy objectives, especially where established gas and electricity infrastructure is available.
Increasing attention is being paid to methane emission measurement, digestate standards, feedstock sustainability and the actual lifecycle performance of projects.
The original illustration accompanying this article, first published in 2018. This guide has been comprehensively revised for 2026. Biogas offers benefits including renewable energy production, organic waste treatment and nutrient recovery, provided methane emissions and digestate are properly managed.
Frequently Asked Questions About the Advantages of Biogas
What are the five main advantages of biogas?
The five main advantages are renewable energy generation, reduced dependence on fossil fuels, better treatment of organic wastes, potential greenhouse gas savings and recycling of fertiliser nutrients through suitable digestate use.
What are ten advantages of biogas?
Ten advantages are renewable energy, reduced fossil fuel use, organic waste treatment, potential methane emission reductions, nutrient recovery, local energy security, flexible energy applications, rural employment, improved sanitation and circular economy benefits.
Why is biogas considered a good source of energy?
Biogas can convert biodegradable material into useful fuel while helping manage wastes. It can also be stored for later use within appropriate gas storage systems. Its value depends on reliable feedstock supply, safe operation, emissions control and economic performance.
Is biogas better than natural gas?
Sustainably produced biogas or biomethane can offer lifecycle greenhouse gas advantages over fossil natural gas, particularly where methane emissions from waste management are avoided. However, these benefits depend on emissions throughout production, processing, transport and use. Both methane fuels must be managed carefully to prevent leakage.
What are the disadvantages of gobar gas?
Gobar gas, generally referring to biogas made from cattle dung, requires a consistent manure supply, suitable water availability, maintenance and safe gas handling. Smaller digesters may have limited output, particularly in cold conditions, and their digestate must be managed hygienically.
What are the advantages of a biogas plant for farmers?
Potential advantages include manure treatment, on-farm heat and electricity, diversification of income, nutrient recycling and reduced dependence on purchased fuels. A suitable system can also offer improved manure management, although digestate storage and spreading remain important responsibilities.
Is biogas completely carbon-neutral?
No. Although biogas contains recently derived biological carbon, greenhouse gas emissions can occur during feedstock production, transport, digestion, gas handling, combustion and digestate management. Lifecycle assessment is needed to determine the net environmental result.
Can biogas completely replace fossil fuels?
Biogas and biomethane can replace fossil fuels in suitable applications, but available sustainable feedstocks and the associated production infrastructure are limited. They are best regarded as part of a broader energy transition rather than an unlimited substitute for all conventional energy use.
Conclusion: Why the Advantages of Biogas Matter
The greatest advantage of biogas is not simply that it produces renewable gas. It is that a well-designed anaerobic digestion system can combine useful energy production with organic waste treatment and nutrient recovery.
These combined benefits can be particularly valuable for agriculture, food processing, wastewater treatment and communities with suitable biodegradable resources.
Nevertheless, a modern assessment must recognise that biogas is not automatically carbon-neutral, digestate is not automatically a safe fertiliser and a digester is not necessarily an economically attractive investment.
The strongest projects are those that use appropriate feedstocks, control methane emissions, maximise useful energy recovery, manage digestate responsibly and demonstrate satisfactory lifecycle and financial performance.
Biogas deserves an important place in sustainable energy and waste management, provided its benefits are delivered and verified rather than merely assumed.
Further Reading
- What Is Biogas? A Guide to Biogas Production and Use
- Anaerobic Digestion Costs
- Biofertiliser Resource List
- Biogas Upgrading Technologies
Technical References
- International Energy Agency (2025). Outlook for Biogas and Biomethane.
- International Energy Agency (2025). Key Findings: Outlook for Biogas and Biomethane. Includes discussion of methane emissions and methane mitigation measures.
- Environment Agency (2025). Anaerobic Digestate Resource Framework. England-specific requirements for qualifying digestate.
Originally published 24 September 2018. Substantially revised October 2026 to incorporate updated evidence concerning methane emissions, energy use, digestate management and the economic and environmental limitations of anaerobic digestion.
By Steve Last, MICE, MCIWM, CEnv – IPPTS Associates. Chartered Civil and Environmental Engineer, Chartered Waste Manager and Chartered Environmentalist.
Reader Discussion and Historical Comments
This article was first published in 2018 and attracted reader comments about digester efficiency, gas appliances, public awareness and the affordability of small-scale biogas systems. Those original comments have been retained below as part of the article’s history.
Technical clarification regarding an earlier claim: The 2018 version compared industrial anaerobic digesters with a cow’s digestive system and suggested that matching a cow’s efficiency could reduce digester volumes by a factor of approximately fifteen. This was a speculative comparison, not an established engineering design relationship. Digester volume depends on feedstock properties, organic loading rate, hydraulic and solids retention times, biological conversion, temperature, mixing, process configuration and the required treatment performance. No general fifteenfold volume reduction can be justified from that comparison.
[Published 24 September 2018. Substantially revised October 2026.]
I especially like the final sentence! The creator’s designs are best. Where is the source of the analysis, please? Also, was it compared with the largest AD plants?
Hi! Brian. Glad you are keeping me on my toes!
I usually produce my content by curation with links back to the originators for verification. This article was a combination of my own thoughts and online research and as you have spotted does not provide sources.
If you mean source of the analysis for the claim that “if AD plants were to match a cow’s stomach in efficiency they could be reduced to approximately one fifteenth of the current volume”. My source for that was the website of an on-farm UK AD Plant where they showed a neat graphic of their plant shrunk to the size it would be if as efficient as a cow.
I cannot now find that website to refer you to it, but I have now found another reference to comparable efficiencies where they say “According to the organisers of a two-day conference taking place in London, a cow‘s stomach is 20-to-30 times better at producing biogas compared to the nearest man made equivalent, which would explain a desire within the anaerobic digestion (AD) industry to understand and replicate processes that take place in nature.” At theengineer.co.uk The conference referred to is the, “7th annual Anaerobic Digestion and Bioresources Association Research & Innovation Forum 2017”.
And, yes. I think they are referring to “standard” large UK and European AD plants (Single-Stage Mesophilic CSRs).
I hope that helps to answer your question.
Where can you buy biogas gas mantles. Are standard mantles OK?
Loved your opinion. This is why I am on internet. Don’t think it’ll catch on though.
People just want to know about trash and garbage, they will always ignore something like this.
It’s just not nice to remind people about waste, just like they don’t want to know about climate change.
The most important question is how much the system will cost. The fact that this is a wonderful approach to assist farmers in lowering their costs raises the question of whether it is cost effective enough for the small farmer to afford to install it. For the tiny farm, I’ve been looking at small gas generators that can be used for cooking and fertiliser production, but they’re prohibitively costly.