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SUSTAINABLE REVOLUTION at ICAM Toulouse

Promising Results from ICAM Toulouse: GREC — The Green Revolution Energy Converter Project Advances

Engineering students Michael Peyrony-Rapatout and Pierre Le Provost at ICAM have once again impressed with a compelling update on their research into the Green Revolution Energy Converter (GREC) — the groundbreaking sustainable heat engine concept by Nils Karlberg.
The GREC engine, which operates purely on heat differentials, represents a novel approach to energy production without relying on combustion. Over several months, they have studied and tested detailed models using Ansys and Matlab to simulate the engine’s thermal and mechanical behavior.

🔍 Key Findings

The team demonstrated that even a non-optimized setup can achieve 6% efficiency, with extremely low energy consumption for revolver operation — confirming the system’s potential viability and scalability.

You may download the presentation as a .pdf file by clicking this link:
ICAM GREC Project Presentation in English

🚀 Future Perspectives

The students outlined several strategic paths to take the project further:

This latest phase of work highlights both the feasibility and promise of the GREC engine as an affordable, scalable, and eco-friendly power solution. The project is now poised for potential funding opportunities . With their solid research foundation and practical insights, the ICAM team is well positioned to follow GREC through further simulations and to a working prototype — and beyond.

👉 Read more about the GREC project and earlier developments

The next phase of the GREC project is being discussed collaboratively by researchers and partners including:

Under the coordination of Dr. Fradin, a detailed roadmap proposes five Work Packages (WPs) for an 18-month low-temperature prototype development, including:

  • CFD optimization of heat transfer (WP1)
  • Mechanical and thermodynamic design of the engine (WP2)
  • Fabrication and assembly of a lab prototype (WP3)
  • Experimental testing and performance validation (WP4)
  • Identification of industrial sites suitable for heat recovery applications (WP5)
  • The project aims to demonstrate a 5-module prototype system, each producing 50W, optimized for temperatures under 200°C using low-cost materials and targeted for TRL 4 (Technology Readiness Level).

    💼 Toward Industrialization

    The collaboration also outlines potential business models, including:

    Initial estimates place required funding at around €185,000, with additional efforts underway to secure equity and co-financing through crowdfunding, capital funding, and regional development programs.


    This marks a pivotal step in GREC’s journey — from academic research to practical innovation, ready to address real-world energy efficiency and recovery challenges.



    The GREC is a new technological solution to tackle climate change. Technologists at Linköping University, Sweden, and at ICAM Toulouse, France, are pushing the challenge of a transition to fossil free energy systems. Their theoretical research, construction, building, and experiments with the GREC Lab Models are very important steps in a climate positive project that will feed several successful research projects over time to reduce the warming of our athmosphere and to reduce CO2 and other pollutants in our athmosphere.
    Please feel free to call or email:

    Contact information at nilsinside AB
    Nils Karlberg nils@nilsinside.com, tel +33 608 53 15 93, theory & technical questions
    Sophia Karlberg sophia@nilsinside.com , strategy & admin questions

    The GREC Project presentation