Renewable Energy Engineering
and Infrastructure
Develop, Build and Operate Renewable Energy Infrastructure
Developing renewable energy infrastructure requires more than engineering expertise. It requires the ability to conduct feasibility analysis, technology selection, plant design, build and operate energy assets that perform reliably across their entire lifecycle.
Fremsyn’s engineering team in Fredericia and Lyngby supports the development of biogas and biomethane infrastructure from project concept to operational energy production.
This includes the construction of anaerobic digestion plants, modernization of existing facilities, operation of biomethane production assets and development of fueling and energy infrastructure for renewable gas and electrified transport.
By combining engineering expertise with operational experience and market integration, renewable energy projects can move efficiently from infrastructure development to stable long-term energy production.
Biogas Plant Engineering (EPC)
Develop new anaerobic digestion and biomethane production facilities through full EPC delivery. Engineering services include plant design, technology integration, procurement, construction management, commissioning and grid connection.
The result is reliable renewable gas production infrastructure built for long-term operational performance. The full EPC delivery of anaerobic digestion plant includes:
engineering design
technology integration
construction management
commissioning
grid connection
Owner’s Engineering & Technical Advisory
Ensure independent technical oversight during the development and construction of renewable energy projects.
Owner’s engineering services represent the interests of investors, developers and utilities by providing objective technical guidance throughout the project lifecycle.
Support typically includes 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.
Biogas Plant Upgrades & Optimization
Modernise existing anaerobic digestion plants to increase gas yield and biomethane production capacity. Plant upgrades focus on process optimisation, equipment replacement and infrastructure improvements that improve plant efficiency and long-term performance.
Typical improvements include:
capacity expansion
process optimisation
infrastructure modernisation
biomethane upgrading improvements
Reliable operation of biomethane production at Thorsø and Foersum Bioenergy, facilities is essential for stable renewable gas supply and long-term asset performance. Professional plant operation combines biological process control, feedstock management and continuous optimization of plant infrastructure to ensure efficient and predictable biomethane output.
Operational expertise supports plant reliability, improved gas yield and long-term performance across commercial anaerobic digestion facilities.
160 GWh
Annual biomethane production
311,000/
Feedstock processed annually
2 Biogas plants
Operating biomethane facilities
48M EUR
CCS · PtX · Renewable electricity
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.
Renewable Energy Infrastructure
The transition to low-carbon transport and energy systems requires new infrastructure that connects renewable gas, electricity and storage technologies. Fremsyn’s engineering team develops and deploys integrated energy infrastructure that supports heavy transport, renewable power integration and flexible energy systems.
From biomethane refueling stations to EV charging hubs and battery energy storage installations, these solutions enable companies and fleet operators to transition toward reliable and scalable renewable energy systems.
Biogas Refueling Stations
Deploy turnkey biomethane refueling infrastructure for heavy-duty transport fleets.
Bio-CNG and bio-CBG stations enable logistics companies and fleet operators to replace diesel with renewable gas while maintaining operational efficiency.
Solutions typically include station design, equipment installation and integration with long-term biomethane supply agreements.
Battery Energy Storage Systems (BESS)
Battery energy storage systems improve grid flexibility and enable more efficient integration of renewable electricity.
BESS installations support peak shaving, grid stabilization and energy storage for EV charging infrastructure and industrial energy systems.
By combining storage with renewable energy production and charging infrastructure, energy systems become more resilient and capable of supporting future electrified transport solutions.
EV Charging Infrastructure
High-power EV charging systems support the electrification of heavy transport and logistics fleets.
Integrated charging solutions can be combined with renewable electricity supply and energy storage to ensure reliable charging capacity even where grid connections are limited.
These systems enable scalable charging infrastructure for trucks, buses and commercial vehicle fleets.
