Our solutions
Territorial methanization
Turn your local organic waste into green energy. Mexens (formerly Technique Biogaz) develops and operates local methanization plants that produce biomethane, which is fed into the gas network, supporting the local circular economy.
Circular economy
Group project
Wastewater versus digestate
Create local value from your organic waste through biomethane
Methanization is a natural biological process that transforms organic matter (livestock effluents, crop residues, agri-food by-products, biowaste, etc.) into two valuable resources: biogas and digestate.
In practical terms, the materials are fed into a digester where, in the absence of oxygen and under the effect of heat, bacteria break down the organic matter. Once refined into biomethane, the biogas produced is injected into the natural gas distribution network. Digestate, the residual product of the process, is an organic fertilizer with high agronomic value that can be used directly on farmland.
Mexens develops territorial biomethane injection projects in partnership with farmers, industrial companies, and local authorities. You are involved in the project and can become a shareholder in the operating company.
Key features of the solution
Collectively turn your organic residues into sustainable energy injected into the grid.
Model
Collective project
Energy produced
100% injected biomethane
Recovery
Local waste → digestate
Governance
Co-shareholding possible
The benefits for your project
By joining a territorial methanization project led by Mexens, you benefit from a win-win partnership that generates economic, agronomic, and environmental value for your farm and your local area.
Economic
Share your costs through a collective project.
By becoming a co-shareholder in the operating company, you help create value in your local area and benefit from the project’s economic returns.
Agronomic
Benefit from digestate with high fertilizing value for your land, partially replacing chemical fertilizers.
Digestate, which is virtually odorless, removes odor nuisance during spreading and improves the biological quality of your soils.
Environmental
Take an active role in reducing greenhouse gas emissions by recovering methane from your organic waste.
You contribute to the production of local renewable energy and to the energy transition in your local area.
Practical
Your effluents are managed outside your farm, increasing your storage capacity.
The management of your agricultural waste is simplified and outsourced through a virtuous short supply chain.
How does territorial methanization work?
Our anaerobic digestion units process an average of 15,000 to 30,000 tonnes of organic matter per year from all stakeholders in the local area. This collective model relies on the diversity and complementarity of feedstocks.
Livestock effluents, crop residues, intermediate energy crops (CIVE). Agricultural resources account for the majority of feedstocks used in anaerobic digestion in France.
Process by-products, fats, rejected production batches, biological sludge. Anaerobic digestion offers a long-term and cost-effective treatment solution.
Biowaste from supermarkets and catering, green waste, sewage sludge. Anaerobic digestion supports the widespread rollout of source separation for biowaste.
- Step 1: Collection and intake – Feedstocks are analyzed, prepared, and introduced into the digester.
- Step 2: Anaerobic digestion – Bacteria convert organic matter into biogas in the absence of oxygen, at 38°C.
- Step 3: Upgrading and injection – The biogas is refined into biomethane and then injected into the natural gas grid.
- Step 4: Digestate recovery – The digestate is used as an organic fertilizer on farmland.
Are you interested in local methanization?
Review my projectRelevant profiles
Livestock farming
Food and drink industry
Cereal growers
Communities
Technical requirements
Ideally stable production of effluent or waste
Owning your own land
To be located near a well-connected road
Our productions
Mexens develops and operates high-performance local biogas plants. Find out more about our operational projects.
Testimonials from partners
Do you have a project?
Your projectWhy choose Mexens?
Contact usOur expertise
Since 2008, Mexens has been designing, building and operating renewable energy infrastructure in France and internationally. With over 1,200 facilities in operation, we have recognised expertise in developing projects with a strong local focus.
Our support
We manage the entire value chain: feasibility studies, administrative procedures, financing, construction, operation and maintenance. You benefit from a single point of contact, from the initial study right through to the day-to-day operation of the facility.
A partnership-based model
Our anaerobic digestion projects are developed in partnership with local stakeholders. You can become a shareholder in the operating company and play a part in the project’s governance, as part of a collaborative approach aimed at sharing value.
Our ethics
Our commitment is also an ethical one: we do not use any primary crops or food intended for human consumption in our digesters. Only waste and by-products are processed, going well beyond regulatory requirements.
Mexens will
take care of your project
From the feasibility study through to the operation of the facility, we support you every step of the way. Our turnkey approach allows you to focus on your core business.
Securing the gas field, the land rights, and the connection to the gas network…
Mexens designs all its installations in-house
Planning permission, ICPE registration, health and safety approval…
Seeking grants and bank loans
Commitment to price, deadlines and performance
Operational management of the unit and financial management of the business
Frequently asked questions about local methanization
Anaerobic digestion can process a wide range of organic materials: animal manure, crop residues and cover crops (CIVE), agri-food industry by-products, municipal and catering biowaste, green waste, and sewage sludge.
Biogas is mainly purified into biomethane and then injected into the natural gas distribution network. It can also be used as fuel (bioNGV), as boiler fuel, or for combined heat and power generation. Mexens prioritizes grid injection, which is the most sustainable solution.
Digestate is the residue from the anaerobic digestion process. Rich in nitrogen, phosphorus, and potassium, it is a high-quality organic fertilizer that is directly assimilable by plants. It partially replaces chemical fertilizers, and its agronomic quality is checked before each application.
Biogas production is governed by strict regulations (ICPE). In practice, biogas is moisture-laden and not pressurized (only a few mbar). Only a few hours of production are stored, equivalent to the energy of a 1,400-liter fuel oil tank. After purification, biomethane is directly injected into the network: no storage, no additional risk. Our sites are equipped with gas detectors, fire extinguishers, an automatic biogas destruction system (flare with booster), and a double-membrane gas holder. An anaerobic digestion unit is no more dangerous than a fuel station.
Decomposition takes place in sealed tanks, in a closed environment with no contact with air: no air, no odor. Digestate, the result of the process, has very little odor compared to slurry or raw manure. Anaerobic digestion therefore helps reduce odor nuisance for nearby residents. Mexens implements strict measures: enclosed buildings under negative pressure with air treatment for manure storage, biological treatment of biogas to remove H₂S, digestate covering, and sites always located more than 200 meters from homes. As for noise, emissions remain minimal: less than 51 dB at 50 meters, equivalent to a washing machine.
From the design stage, careful consideration is given to landscape integration: adapted colors, partial burying of tanks, and planting hedges. Project developers are encouraged to work with architects specialized in landscape integration.
Yes. Mexens offers partnerships that may include taking an equity stake in the operating company. You then become a shareholder and take part in the project’s governance.
No. At Mexens, we do not use any primary crops or food intended for human consumption. Our digesters only process waste and by-products: agricultural effluents (manure, slurry), plant waste unfit for consumption, and unused resources such as cover crops or roadside grass. French law also limits the use of dedicated crops in digesters to a maximum of 15%. Mexens goes beyond this requirement by not using any.
Do you have any other questions?
Contact our teams
Are you interested in local methanization?
Are you a farmer, a food industry professional or a local authority? Get in touch with our teams to assess the potential of your area and the feasibility of a biogas project.
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