Visita il sito del nostro partner Eliopig e approfondire tutti i servizi dedicati alla realizzazione, installazione, messa in opera e avviamento di impianti biogas e biometano.
of experience
Synergy srl supports agricultural entrepreneurs, farmers and industrial companies in the construction of custom biogas plants.
With twenty years of hands-on experience in anaerobic digestion, we manage every project phase feasibility study, authorisation, construction and commissioning ensuring an efficient plant, that complies with current regulations.
Biogas plants convert organic matter into renewable energy through a natural biological process: anaerobic digestion.
Synergy designs and builds biogas plants that make the most of the resources already available on your site livestock manure, agricultural biomass and food-industry by-products turning them into electricity, heat and digestate.
We work primarily with:
- Pig, cattle and poultry farms.
- Cereal, fruit and vegetable companies handling large volumes of biomass.
- Agri-food businesses with organic waste to valorise.
- Agricultural consortia and cooperatives looking for shared projects.
A biogas plant is a system designed to produce biogas through the anaerobic digestion of organic materials.
Visit the website of our partner Eliopig to explore all the services dedicated to the design, installation, commissioning and start-up of biogas and biomethane plants.
Every biogas plant is built around the anaerobic digester, a sealed tank where specialised bacteria break down organic matter in the absence of oxygen. The process unfolds in four biological phases — hydrolysis, acidogenesis, acetogenesis and methanogenesis — producing biogas composed mainly of methane (CH₄) and carbon dioxide (CO₂).
At Synergy, we manage the entire cycle:
- Pre-treatment area: incoming substrates (slurry, biomass and co-substrates) are shredded, mixed and homogenised to maximise biological yield in the digester.
- Anaerobic digester: the plant's core component, sized to match the available substrate and the required energy output. We continuously monitor key parameters such as temperature, pH and C/N ratio to ensure process stability.
- Biogas treatment: hydrogen sulfide (H₂S) removal through biological or chemical systems to protect the cogeneration unit and to comply with regulatory emission limits.
- Cogeneration: the cleaned biogas fuels an internal combustion engine connected to a generator and heat exchangers, producing both electricity and useful heat (high-efficiency cogeneration, CHP).
- Digestate management: the process output is separated into solid and liquid fractions, both of which can be used as organic fertiliser in place of synthetic ones, in compliance with the Nitrates Directive.
Every biogas plant is unique. Size, substrates, location and client requirements vary with every project. Synergy works with each client through a structured 6-phase process designed to minimise risk and maximise return on investment.
We assess the resources available (quantity and quality of substrates), estimate energy production, calculate capital expenditure (CAPEX) and operational expenditure (OPEX), and evaluate applicable incentives — delivering a clear business plan that enables an informed decision before committing resources.
Together, we define the optimal plant size, technology configuration and contractual model. Synergy works with financial partners specialising in the biogas sector to support access to funding and structure the business plan.
We manage the entire permitting process — Environmental Impact Assessment (EIA), Single Authorisation (AU), grid operator (TERNA) applications and GSE documentation for accessing incentives. Our experience across Italy enables us to navigate complex regulatory requirements efficiently.
We develop all engineering deliverables: mass and energy balances, plant layout, civil, mechanical, electrical and control-system design. Every Synergy biogas plant is engineered to meet the highest safety standards while ensuring ease of operation.
We build the plant from concept to grid connection: civil works, digester installation, mechanical and electrical assembly, cabling and control systems. The EPC (Engineering, Procurement and Construction) contract ensures transparency on costs and timelines.
Commissioning is the most critical phase: we manage the bacterial inoculation, biological ramp-up and all performance testing before final handover. After start-up, we offer operations and maintenance (O&M) contracts to ensure long-term performance.
The regulatory landscape is changing rapidly. Synergy constantly monitors the latest developments and keeps you updated on the opportunities relevant to your project. Contact us for a bespoke analysis.
Italy’s incentive framework for biogas plants is complex and evolving — these are the main schemes currently available:
- FER2 Decree (M.D. 19 June 2024): provides incentives for biogas plants up to 300 kWe through an all-inclusive tariff or an incentive on the zonal price, via competitive tender procedures managed by the GSE. The second 2025 tender procedure was open until September 2025.
- NRRP (PNRR) Ecological Practices incentives (M.D. 99/2024): capital grants covering up to 65% of eligible expenditure for investments in existing agricultural biogas plants, including heat recovery systems, covered digestate storage tanks and emission abatement equipment.
- Biomethane incentive tariff (M.D. 15 September 2022): for plants converting biogas to biomethane for injection into the gas grid or use as transport fuel.
In the biogas market, what sets a true partner apart from a supplier only shows over time. Synergy grew out of Eliopig – over 100 plants – and twenty years of experience with a clear focus: specialist expertise in the biological process at the heart of every plant.
Twenty years of experience
In the biogas and biomethane sector
Multidisciplinary team
process engineers, civil designers and regulatory specialists
Bankable EPC contracts
transparency and reliability for access to financing
Member of the Italian Biogas Consortium (CIB)
the industry benchmark in Italy
Full support
from business plan to first revenue, and beyond
International partner network
projects completed in Italy and abroad
The cost of a biogas plant depends on size, substrates, location and technology configuration. As a general guide, a 100 kW plant requires an investment of around €1,500,000, while a 300 kW plant can exceed €3.5 million. Synergy provides a free feasibility study at the outset, giving you a precise CAPEX for your specific project.
The most common substrates in agricultural biogas plants are livestock manure (pig and cattle slurry, poultry litter), crop biomass (maize, sorghum and triticale silage), agri-food industry by-products (whey, process wastewater, fruit and vegetable waste) and energy crops. Substrate availability and quality determine process yield and optimal plant size.
From contract signing to commissioning, a typical timeline is 18–24 months. The permitting process accounts for most of this averaging 6–12 months depending on the region while construction itself takes 4–8 months depending on plant size.
Under the current incentive framework (FER2 and NRRP incentives), a well-designed biogas plant can reach payback in 7–10 years and generate significant returns over the incentive period (20 years under FER2). Profitability depends on the availability of zero- or low-cost substrates (such as the farm’s own livestock manure) and on process optimisation over the plant’s operational lifetime.
Get in touch for a free consultation: we assess your project’s feasibility, estimate energy production and provide a preliminary cost and incentive analysis with no obligation.
