BioGas Integration →

Converting conventional biogas plants into carbon-negative circular energy hubs through CO₂ capture, hydrogen, and synthetic fuel production.

BioMass Integration →

Upgrading biomass and CHP facilities with BECCS, hydrogen coupling, gasification, and heat-loop recovery for negative-emission energy.

Upcoming Modules →

Industrial Waste-to-Energy Integration, Direct Air Capture Coupling, and Maritime & Aviation Fuel Applications (e-Methanol & SAF).

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Advanced Membrane CO₂ Capture!

ISEN uses polymeric membrane separation for CO₂ capture—a proven industrial technology that eliminates the complexity, cost, and thermal demands of traditional chemical absorption (amine) systems.

Why Membrane Technology?

✓ No chemical solvents or hazardous materials
✓ No thermal regeneration (zero steam consumption)
✓ 30% lower capital cost vs amine systems
✓ Fully electrically driven (integrates with renewable power)
✓ Rapid response (minutes, not hours)
✓ Predictable maintenance (comparable to compressor stations, not chemical plants)

This membrane-first architecture enables modular brownfield integration with existing biogas, biomass, and CHP facilities—delivering carbon-negative operations without the complexity of conventional CCU systems.

How It Works

1. Membrane Capture
CO₂ from existing plants is captured using advanced polymeric membranes—requiring no chemical solvents or thermal regeneration. The membrane cascade operates on pressure differentials alone, delivering 75-85% CO₂ recovery from flue gas.

2. Hydrogen Integration
Captured CO₂ is combined with renewable hydrogen (sourced from pipeline networks, nearby electrolyzers, or optional on-site generation for remote locations) to synthesize carbon-neutral fuels.

3. Methanol Synthesis & Heat Recovery
The integrated synthesis loop converts CO₂ and H₂ into methanol while recovering process heat across three thermal tiers for district heating networks.

4. Digital Optimization
Every ISEN module is controlled by IDOS (ISEN Digital Optimization System) and connected through the Freyra ESG Dashboard, providing real-time optimization, predictive maintenance, and verified emission tracking.

Outputs:

• Synthetic Fuels (e-Methanol, e-Methane)
• District Heat (20-30 GWh/year)
• Negative Emissions (ETS credits)
• Verified ESG Reporting

Technology + ESG = Freyra ESG Dashboard

The Go Freyra platform tracks carbon, energy, and financial performance across ISEN installations — providing transparent data for regulators, investors, and operators.

Key Standards:

• ISO 14064 (GHG Accounting)

• EU ETS & CBAM Ready

• CSRD / ESG Reporting Alignment

About ISEN

Integrated Sustainable Energy Nexus (ISEN) is a Danish-led initiative developed by Dan Sommer and GoFreyra ApS, connecting biogas, biomass, and industrial energy systems into one modular circular platform.

By combining advanced membrane CO₂ capture, renewable hydrogen integration, methanol synthesis, and three-tier thermal recovery, ISEN turns existing facilities into next-generation clean-energy nodes—achieving carbon-neutral or carbon-negative operations with proven industrial technologies.

Core Technology:
Membrane-based CO₂ separation eliminates the chemical solvents, thermal regeneration, and operational complexity of traditional carbon capture systems—delivering 30% lower capital costs and 17% lower operating costs while maintaining industrial reliability.

Mission:
To decarbonize regional energy production while enhancing local prosperity and resource efficiency through commercially viable carbon capture and utilization.

Vision:
To create a replicable, scalable model for carbon-negative, circular energy systems across Europe—crossing the threshold from subsidy-dependent to commercially profitable CCU operations.

Regal Outreach Partnership
ISEN Energy partners with Regal Outreach Consulting (Poland) to strengthen European collaboration in sustainable and circular energy.
Led by Anna Sommer, Regal Outreach provides services such as market insight, stakeholder engagement, and mediation support, connecting Danish innovation with Central European opportunities for carbon-negative energy transformation.

www.regaloutreach.eu 

Industrial Builders Partnership
ISEN Energy collaborates with Industrial Builders Inc. (USA) to advance modular and scalable energy infrastructure.
This partnership combines ISEN's circular energy and CO₂ integration systems with IB's proven engineering, construction, and project management expertise — supporting the development of next-generation, carbon-negative facilities across Europe and North America.

www.ib-usa.com  

Freyra Group Partnership
ISEN Energy works in close collaboration with Freyra Group ApS (Denmark) to integrate ESG intelligence and biodiversity data into circular energy systems.
Freyra's advanced ESG dashboard and analytics tools enhance ISEN's digital layer, ensuring transparent reporting, environmental accountability, and measurable progress toward carbon-negative, sustainable operations.

www.gofreyra.com 

Compatibility

ISEN modules are fully compatible with:

• Combined Heat and Power (CHP), biogas upgrading, and biomass plants
• Flue-gas streams with CO₂ concentrations between 6–20% (optimal for membrane separation)
• Low-pressure operation (membrane cascade operates at <2 bar differential)
• Standard 4–20 mA and Modbus protocols for SCADA integration
• District heating and steam networks (70–120 °C supply)
• EU and Danish safety and environmental standards (EN 746, ISO 14001, ISO 50001)

Membrane Advantages for Brownfield Integration:

✓ No chemical handling infrastructure required (no solvent storage, dosing, or reclaim systems)
✓ No thermal coupling needed (eliminates steam extraction from existing CHP systems)
✓ Rapid start/stop capability (responds to electricity price signals in minutes, not hours)
✓ Minimal footprint (membrane racks + compression skids vs large absorption towers)
✓ Prefabricated modular construction (containerized units reduce on-site civil work)

Installation normally occurs without production downtime, using prefabricated skids and plug-and-play interfaces for simplified mechanical and electrical integration.

Strategic Mission

ISEN's mission is to make carbon-neutral/negative operation a commercially viable standard through proven, scalable technology integration.

We achieve this by:

• Deploying membrane-based CO₂ capture to eliminate the cost, complexity, and thermal demands that make traditional CCU systems economically unviable
• Reducing integration barriers through modular brownfield design that works with existing biogas, biomass, and CHP infrastructure
• Enabling operators to monetize CO₂ through synthetic fuels (e-methanol, e-methane), district heat recovery, and verified carbon credits
• Demonstrating scalable pathways for BECCU (Bio-Energy with Carbon Capture and Utilization) and Power-to-X systems within existing energy grids—without requiring geological storage infrastructure
• Leveraging AI optimization (IDOS) to ensure predictable performance, minimal downtime, and commercially profitable operations from day one

Integration

Digital Control & ESG Reporting

ISEN installations are controlled by IDOS (ISEN Digital Optimization System)—an AI-driven process control platform that optimizes capture rates, compression loads, and synthesis efficiency in real-time while providing predictive maintenance forecasting.

IDOS feeds operational data to the Freyra ESG Dashboard, which provides:

• Real-time process optimization: Economic dispatch based on electricity prices, heat demand, and methanol market conditions
• Predictive maintenance: Forecasts membrane replacement, compressor service intervals, and dryer regeneration cycles
• Automated ESG data collection: Scopes 1–3 carbon accounting with verified emission reductions
• EU ETS & CBAM integration: Direct export of carbon credit documentation to regulatory portals
• Performance benchmarking: Multi-site comparison and efficiency tracking
• Investor-grade reporting: CSRD, GHG Protocol, and ISO 14064-compliant dashboards

Combined Value:
IDOS optimization delivers 17% OPEX reduction and 2-4 M€/year additional profit through adaptive operation, while Freyra Dashboard ensures transparent, verifiable reporting for regulators, investors, and operators.

Core Engineering Functions 

CO₂ Membrane Separation & Compression

Advanced polymeric membranes selectively capture CO₂ through pressure-driven permeation—requiring no chemical solvents, thermal regeneration, or liquid handling.
• Captures CO₂ from flue gas (6-20% concentration)
• Multi-stage membrane cascade for high efficiency (75-85% recovery)
• Compression to synthesis pressure (15-20 bar)
• Molecular-sieve drying to synthesis-grade specifications
• Output: Dry, pressurized CO₂ (≥98% purity) ready for conversion

Hydrogen Integration Module
Flexible hydrogen sourcing designed to match site-specific conditions and economics.
• Primary mode: Pipeline hydrogen or nearby electrolyzer supply
• Optional mode: On-site electrolyzer module for remote/isolated sites
• Output: Green hydrogen for methanol or methanation synthesis

Methanol Synthesis Reactor
Catalytic conversion of captured CO₂ and renewable hydrogen into carbon-neutral methanol.
• Cu/ZnO/Al₂O₃ catalyst system (proven industrial technology)
• Modular skid-mounted reactors for brownfield integration
• 0.50-0.60 t MeOH per t CO₂ conversion efficiency
• Output: Synthesis-grade methanol (e-MeOH) for fuel or chemical applications

Three-Tier Thermal Recovery System
Cascaded heat recovery across multiple temperature levels maximizes energy efficiency.
• Tier 1: Synthesis reactor heat (200-280°C)
• Tier 2: Compression intercoolers (90-130°C) → District heating
• Tier 3: Aftercoolers (65-80°C) → District heating return
• Output: 20-30 GWh/year recoverable district heating

Carbon Storage Interface (Optional)
For sites with access to geological storage infrastructure.
• CO₂ compression and conditioning for transport
• Integration with CCS pipeline networks or well injection
• Output: Verified negative-emission credits (BECCS pathway)

IDOS Digital Control & Optimization
AI-driven process control and predictive maintenance system.
• Real-time optimization of capture rate, compression load, and synthesis efficiency
• Predictive maintenance forecasting (membrane EOL, compressor service, dryer regeneration)
• Economic dispatch optimization (power price response, heat vs fuel priority)
• ESG data integration with Freyra Dashboard for automated regulatory reporting
• Output: 17% OPEX reduction + 2-4 M€/year additional profit through optimization

Why Denmark?

Denmark leads the world in district heating, biomass utilization, and circular energy.
ISEN's base in Sønderjylland leverages proximity to wind power, biomass resources, and strong municipal collaboration — making it the ideal launch region for Europe's first Integrated Sustainable Energy Nexus.

About the Founder

Dan Sommer is the Founder and CEO of ISEN Energy, a Danish initiative dedicated to transforming existing energy infrastructure into circular, carbon-negative systems.
He is also the co-founder of Go Freyra, an ESG and biodiversity intelligence company based in Denmark, and co-founder of Skyfjord Fuel in Iceland, developing sustainable aviation and energy solutions for the North Atlantic region.

Dan serves as Director of Business Development at Industrial Builders Inc. (USA), where he leads international collaborations in advanced energy and infrastructure projects.

With a lifelong passion for nature, conservation, and mountain exploration, Dan brings the perspective of an avid mountaineer to his leadership — believing that the courage, clarity, and endurance required in the mountains are the same qualities needed to drive innovation and sustainability in the global energy transition.