Energy solutions, built around biomethane
Fremsyn integrates engineering, sourcing, biogas production, biomethane trading, energy storage and e-mobility infrastructure across the full energy value chain.
130 GWh
Production yearly
202.000t
COâ‚‚ displaced yearly
4 Countries
DK-SE-NL-CH
1 TWh
Handled in 2025
Become a part of the carbon cycle
Biogas is part of the circular carbon cycle, turning biological residues into renewable energy through biomethane, green power and tailored infrastructure solutions.
Fremsyn works across the full chain — from feedstock and production to upgrading, grid injection, CO₂ capture, and the purchase and sale of Guarantees of origin.
This enables biomethane with a very low, and in some cases net-negative, carbon footprint for industry, transport LNG, CNG and EV-charging, heating and power generation or storage.
Commercial
Access reliable biomethane, green certificates and market know-how for industry, transport, maritime and heating.
Our trading team also supports biogas plants with sourcing of industrial biomass and stronger commercial optimisation.
Development
Get advisory and practical solutions that help turn your renewable energy ambitions into real projects.
We build all types of infrastructure, including upgrade facilities, CCU/S, and PtX, shaped around your technical, commercial and strategic needs.
Production
Renegas is part of Fremsyn - We operate two plants in Denmark, one newly built and one modernized existing facility, and is expanding with two further plants in development for grid connection in 2027 and 2028.
At Fremsyn, we envision a future free of fossil fuels, powered by accessible, sustainable alternatives on the plant’s terms.
Why Work With Fremsyn
Let us solve your complex energy project with the right documentation certification, engineering and trading across renewable energy markets with one partner.
Fremsyn is a partner for companies that need renewable energy solutions to be technically sound, commercially viable and fully documented.
We combine infrastructure, engineering, certification, digital compliance and market access in one integrated setup, helping you reduce complexity and move faster with confidence.
By connecting production, documentation and commercial delivery, we make renewable energy easier to manage, easier to verify and easier to scale.
Automate mass balance and PoS generation
Start improving your biogas workflow today
No more spreadsheets. Biolens delivers end-to-end transparency across the entire biomethane value chain by replacing fragmented manual workflows with one unified platform for fully traceable documentation.
Other Key Features
Spend less time on reporting
Ensure high data integrity
Audit-ready documentation
CI-score feedstock tracking
Get the opportunity to make a comparison of expected vs. actual production and a system prepared for EU Union Database integration as biomethane requirements evolve towards 2027.