Renewable Energy Engineering
and Infrastructure
We develop, build and operate renewable infrastructure
Developing renewable energy infrastructure requires more than engineering expertise — it requires the ability to move projects from concept to reliable, long-term operation.
We deliver end-to-end engineering and infrastructure solutions across the renewable energy value chain.
From early feasibility analysis, technology selection and plant design to full EPC delivery, commissioning and operational optimization, we support projects throughout their entire lifecycle.
Our engineering teams in Fredericia and Lyngby at DTU Science Park, design, build and operate biogas and biomethane plants, upgrading facilities, battery energy storage systems (BESS) and fueling infrastructure for both renewable gas and electrified transport.
This includes anaerobic digestion plants and capacity expansions, as well as Bio-CNG, Bio-LNG and EV charging infrastructure integrated with energy systems.
By combining engineering expertise with hands-on operational experience and market integration, we ensure a scalable renewable energy infrastructure that supports industrial decarbonization, energy security and long-term value creation across European energy markets.
Foersom Bioenergy Plant Engineering (EPC)
Modern biomethane facility developed through full EPC delivery — from plant design and technology integration to construction, commissioning and operation.
Engineering delivery includes plant design, procurement, construction management, commissioning and grid connection, ensuring a fully integrated and high-performing biomethane production facility.
The plant is built with modern technology and designed for efficient, stable and scalable operation. Strong local integration and close collaboration with the surrounding community support long-term operational success.
Foersom is prepared for future energy integration, including CO₂ capture and PtX production, and is strategically located next to a 400-hectare solar energy project — enabling further integration of renewable electricity and sector coupling.
The result is reliable renewable energy infrastructure designed for long-term performance, optimized biomethane production and future low-carbon energy systems.
65 GWh
Annual biomethane production
106.000/t
Feedstock processed annually
13.750/t
Overall CO₂ reduction, annually
5 M Nm3
Methane injection to the grid
Owner’s Engineering & Technical Advisory
Get independent technical oversight during the development and construction of your renewable energy project.
Owner’s engineering services represent the interests of investors, developers and utilities by providing objective technical guidance and knowhow throughout the project lifecycle.
Support typically includes design, technology evaluation, review of engineering design, supplier assessment and supervision during procurement and construction phases.
This independent perspective helps control project risks, maintain cost discipline and ensure that renewable energy assets are built to deliver reliable long-term performance.
Thorsø Biogas Plant Upgrades & Optimization
Thorsø Bioplant is a mature biomethane facility undergoing a comprehensive modernization and optimization program to improve efficiency, reduce energy consumption and strengthen long-term asset performance.
Optimization and modernized 2024–2026
Reduced heat consumption through integration
of industrial heat pumpsImproved energy balance and process efficiency
Planned BESS installation (2026/27)
The plant is being upgraded to integrate future technologies and enhance overall energy performance. This includes preparation for CCS implementation from early 2027 and the use of pyrolysis of the fiber fraction from digestate to generate process heat.
Through advanced energy integration and continuous operational optimization, Thorsø achieves very high overall CO₂ reduction while maintaining stable and efficient biomethane production.
Fremsyn’s combined engineering and operational expertise ensures improved efficiency, scalable performance and long-term value creation across biomethane assets.
95 GWh
Annual biomethane production
206.000/t
Feedstock processed annually
20.100/t
Overall CO₂ reduction, annually
8M Nm3
Methane injection to the grid
Operational
Track Record
Fremsyn’s engineering and operations Renegas team combines project development with hands-on experience in operating commercial biomethane production facilities.
Continuous optimization of plant biology, feedstock logistics and upgrading systems ensures stable renewable gas output and reliable long-term asset performance.
Operational experience gained through the management and modernization of existing biomethane plants provides valuable insights that strengthen the development of new projects.
Lessons from daily plant operations, maintenance strategies and process optimization are integrated directly into engineering design and infrastructure development.
This combination of engineering capability and operational expertise supports the delivery of renewable energy infrastructure designed for efficiency, reliability and long-term performance.