CO2 Trading Platform for Emission Certificates
Sector: Tertiary sector · Industry: Renewable energy · Organisation: Blockchain Reallabor · Maturity level: Pilot
The CO2 trading platform records companies' emission values and enables transparent trading of CO2 certificates via blockchain technology. The solution creates cost advantages for companies that reduce their emissions as they can sell excess certificates. Currently, the platform is in the demo phase, demonstrating how emission trading can work via blockchain.
Documentation status
- Project status: Pilot
- Evidence: Evidence medium
- Editorial review: Ufuk Avci, 15 April 2026
Description
The Blockchain Reallabor in Hürth, a flagship project of the Fraunhofer Institute for Applied Information Technology FIT led by Prof. Wolfgang Prinz (RWTH Aachen), has developed a CO2 platform as a demonstrator. The system shows how blockchain can increase traceability and tamper resistance in the CO2 certificate trade — a central problem in existing systems where double use of certificates or retroactive changes are possible.
The Blockchain Reallabor started in 2020 at the euronova CAMPUS in Hürth (NRW), funded by the NRW Ministry for Economy, Innovation, Digitalisation and Energy (MWIKE). Prof. Wolfgang Prinz, deputy institute director at Fraunhofer FIT and professor at RWTH Aachen, leads the Reallabor. The CO2 platform is one of several demonstrators alongside: digital product passports (Industry 4.0 model), Studio 6 SSI ecosystem for digital access control, and remote maintenance. Goal of the CO2 platform: blockchain enables immutable documentation of CO2 emission data and certificates. Manipulations — such as retroactive adjustments or double use of certificates — are structurally excluded. The Reallabor demonstrates the use case for companies and SMEs considering blockchain use for sustainability reporting and EU CSRD compliance.
Perspectives
B2B — organisations perspective
Companies that purchase carbon offsets or trade carbon certificates receive tamper-proof proof of validity and uniqueness of these certificates via a blockchain platform — important for CSRD reporting and protection against greenwashing.
B2C — consumers perspective
End consumers benefit indirectly through companies acting more climate-neutrally and can transparently track the sustainability efforts of their preferred brands.
Employees perspective
Sustainability teams can document CO2 emission data in an audit-proof manner on the blockchain and provide it immediately verifiable for external audits and regulators, without complex manual reconciliation processes.
Benefits
General
- Transparent and forgery-proof trading of CO2 certificates through blockchain technology.
- Monetisation of CO2 savings creates direct financial incentives for emission reduction.
- Automated smart contracts reduce transaction costs and eliminate intermediaries.
B2B — organisations
- Cost advantages for companies that successfully reduce their emissions and can sell surplus certificates.
Employees
- Simplified management and reporting of CO2 certificates through automated blockchain processes.
Challenges
General
- Regulatory recognition of CO2 certificates traded via blockchain must be ensured.
- Acceptance by companies and integration into existing emissions management systems is critical for success.
B2B — organisations
- Companies must adapt their internal processes for emissions data collection to the platform requirements.
Employees
- Employees require training in handling blockchain-based trading systems and new compliance processes.
Technology foundation
The platform uses a permissioned blockchain that grants access only to authorised participants, thereby providing high security and control. Smart contracts automatically monitor trading conditions and ensure transparent, tamper-proof transactions without intermediaries.
Implementation examples
CO2 trading platform demo
The platform addresses the growing need for companies to make their supply chains climate neutral while reducing costs. It offers an alternative to complex regulatory processes through market-based solutions.
The Blockchain Reallabor developed a demo platform that shows how CO2 certificate trading can work via blockchain.
The CO2 trading platform of the Blockchain Reallabor records the emissions values of all global partners and enables companies with negative or positive emissions to buy or sell CO2 certificates. The platform creates incentives for emissions reduction by offering cost advantages to low-emission companies. The system was developed as a demo to demonstrate the potential for transparent and automated emissions trading.
The solution makes emissions trading more transparent and cost-effective than traditional methods. It eliminates intermediaries and reduces administrative efforts in certificate management.
Tags
CO2 Trading, Emission Certificates, Smart Contracts, Climate Protection, Transparency