Your Trusted Partner in
Green Gas
Solutions
Green Gas Solutions connects biogas producers, utilities, EPCs and project developers with selected technologies for gas treatment, upgrading, compression, grid injection and liquefaction — backed by local Nordic project experience from early evaluation through commissioning and service.
Specialist Technology
Local Nordic Support
As the Nordic representative for selected international technology partners, Green Gas Solutions combines specialist technology with local market knowledge and hands-on project support. We help customers evaluate technical and commercial options, bring the right specialists together and support each project from early development and contracting through delivery, commissioning and service.
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The name Green Gas Solutions reflects the breadth of our expertise. We work across the green-gas value chain—from H₂S removal, air treatment and NH₃ stripping to biogas upgrading, gas compression, grid injection, CO₂ liquefaction, LBG production and hydrogen applications.
These technologies often form part of an integrated process, but they also support standalone applications across the energy and industrial sectors.
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We start with the project requirements—not a predefined solution. By understanding the gas composition, process objectives, site conditions and commercial priorities, we help assess the available options, identify the right technology and coordinate the specialist expertise needed to move the project forward.
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We support biogas producers, utilities, municipalities, EPC contractors, engineering companies, technology integrators and project developers across Denmark, Sweden, Norway, Finland and Iceland.
Our Solutions
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MEMBRANE BIOGAS UPGRADING
Produce high-quality biomethane from raw biogas with BIMEO's modular ValorGas® membrane systems, using Evonik SEPURAN® Green technology. The process combines high methane recovery with low energy consumption and can deliver both biomethane and a concentrated CO₂ stream.
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H₂S REMOVAL
Protect downstream upgrading, compression and liquefaction equipment with ECOTEC’s biological and regenerative chemical desulphurisation technologies. Unlike systems that introduce air or oxygen directly into the biogas, ECOTEC removes H₂S without adding O₂ to the treated gas stream, helping preserve gas quality.
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BIOGAS & BIOMETHANE COMPRESSORS
Oil-free reciprocating compressor systems from Fornovo Gas for biogas, biomethane, grid injection and CNG applications. The technology protects gas purity while reducing oil consumption and supporting efficient, reliable operation.
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CO₂ LIQUEFACTION
Recover and liquefy the biogenic CO₂ separated during biogas upgrading. MachOne technology can turn a residual gas stream into a valuable product for industrial, food-grade or greenhouse applications, subject to the required purification specification.
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AIR & ODOUR TREATMENT
Control odours and treat contaminated air from biogas plants, wastewater facilities, composting sites and industrial processes. Solutions are configured around the specific air flow, contaminant load and local emission requirements.
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BIOMETHANE LIQUEFACTION
Convert biomethane into liquefied biogas — also known as LBG or Bio-LNG — for heavy transport, maritime and industrial applications. Modular liquefaction technology creates a transportable, energy-dense fuel from upgraded biogas.
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CNG FUELING
Compression and fuelling infrastructure for natural gas, biomethane and fleet applications. Together with Fornovo Gas, GGS supports the selection of safe, efficient systems for compression, storage and vehicle fuelling.
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AMMONIA STRIPPING
Reduce ammonia emissions from digestate treatment, wastewater facilities and industrial exhaust streams. NH₃ stripping and scrubbing systems support regulatory compliance while creating opportunities to recover nitrogen for reuse.
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HYDROGEN SOLUTIONS
Gas treatment, compression and handling equipment for hydrogen production and distribution. GGS helps identify H₂-compatible technologies and coordinate their integration with the wider process and project requirements.
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SERVICE & MAINTENANCE
Together with Terotech, our service and maintenance partner, GGS provides coordinated technical support throughout the operational life of your installation, from commissioning and preventive maintenance to planned shutdowns and ongoing service.
WHY GREEN GAS SOLUTIONS ?
Industry Experience Since 2006
GGS has supported Nordic biogas and renewable-gas projects since 2006. Our experience across technologies, project types and markets helps us identify risks early, ask the right questions and move projects forward.
Proven Nordic Project Experience
We have contributed to more than 80 renewable-gas projects across the Nordics, working with biogas producers, utilities, municipalities, engineering companies and private developers.
GGS combines selected specialist technology with local market knowledge and direct project support. We help customers assess technical and commercial trade-offs and coordinate with the people behind the technology.
One Trusted Point of Contact
One partner for your entire biogas solution. From technology selection and project management to commissioning and maintenance — no gaps, no handoffs.
Chosen by Major Nordic Utilities
Biogas projects are complex. They require deep technical knowledge, reliable technology partners, and an integrator who understands the Nordic regulatory landscape. That's exactly what we bring.
Industry-Leading Technology Partners
We represent the best-in-class suppliers in each technology category — rigorously selected for performance, reliability, and Nordic market suitability.
Full-Lifecycle Partnership
We stay with you after delivery. Planned maintenance, remote monitoring, performance optimisation — we're a long-term partner, not a one-time supplier.
Technology Partners
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DESULPHURIZATION & AIR TREATMENT
Biological and chemical treatment systems for H₂S removal, odour control and industrial air treatment. ECOTEC’s dBiox® technology is proven across the Nordic region and in installations worldwide.
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MEMBRANE BIOGAS UPGRADING
Modular membrane systems that upgrade biogas to biomethane with methane recovery above 99.5% and slip below 0.5%. The process also produces a concentrated CO₂ stream for further valorisation.
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COMPRESSOR SOLUTIONS
Oil-free reciprocating compressor systems for biogas, biomethane, grid injection, Bio-CNG, CO₂ and hydrogen. More than 55 years of engineering experience, tailored to each application and operating profile.
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CO₂ & CH₄ LIQUEFACTION
Modular systems that turn biomethane into transportable LBG/Bio-LNG and recover biogenic CO₂ as a liquid product—creating two valuable output streams from one biogas plant.
Recent Projects
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HOFOR — Damhusåen Wastewater Plant, Copenhagen
ECOTEC and BIMEO won the HOFOR tender to upgrade biogas from Copenhagen's Damhusåen wastewater treatment plant. BIMEO's valorGas® membrane system (Evonik Sepuran® membranes) delivers biomethane directly into the city gas grid. Flow: 600 Nm³/h · CH₄ >99.5% · CO₂ stream >99% purity.
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BioCirc — Grønhøj Biogas - Desulphurization for Permanent CO₂ Removal
BioCirc — one of the world's leading biogas producer — selected Ecotec's dBiox® biological desulphurisation technology for their pioneering permanent biogenic CO₂ removal programme at Grønhøj, Denmark. The dBiox system treats 900 Nm³/h of CO₂ off-gas, reducing H₂S from up to 5,800 ppm to below 50 ppm — a critical requirement for downstream CO₂ liquefaction. Part of BioCirc's ambition to capture 140,000 tonnes of CO₂ annually across five Danish biogas plants from 2026.
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Vireo AS — Lista & Hardanger, Norway
Following a competitive multi-supplier tender, Vireo AS selected Ecotec's Q-REN regenerative chemical desulphurization technology for two new biogas plants at Lista and Hardanger. Plants convert organic residues into renewable gas for industry and transport. Commission: 2026 and 2027. Flow: 1,750 Nm³/h per plant. Green Gas Solutions supports the projects commercially and technically throughout development and implementation.
What Our Clients Say
Trusted By
References Across
the Nordic Region
Over the years we have delivered green gas solutions to biogas plant operators, utilities, grid operators and municipalities across Denmark, Sweden, Norway, Finland and Iceland. From H₂S bioscrubbers, Injection compressors, biogas upgrading plants to CNG stations and liquefaction units.
Our Team
We believe in personal relationships. When you contact Green Gas Solutions, you speak directly with decision-makers who know your technology and your market.
Niels G. Conradsen
Founder & CEO
Rasmus Høg Damsbo
Senior Business Development Consultant
Ready to Talk Green Gas?
Whether it's biogas upgrading, H₂S removal, CO₂ liquefaction, hydrogen treatment, or CNG infrastructure — our experts are ready to help you find the right solution for your project.