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HyWICE

Spacer, designed to connect H2 and H20 injectors, an economical and effective solution to accelerate decarbonation

July 2025

HyWICE

Spacer, designed to connect H2 and H20 injectors, an economical and effective solution to accelerate decarbonation

  • World Alliance Member
  • Featured Solution
  • Labelled Solution
Label Date July 31, 2025
From France
Maturity stage TRL 6 / 7 - Prototype demonstration 1:1

The Hywice solution converts a diesel engine into a hydrogen (H₂) engine. We introduce water into the combustion chamber to regulate temperature and prevent NOx formation. Hydrogen is used for decarbonization. This approach provides a clean, cost-effective solution for trucks, barges, and buses, accelerating the decarbonization of heavy-duty transport. It is affordable, requires no precious metals or rare earth elements, and supports reindustrialization. Currently, alternative solutions are five times more expensive than diesel, making rapid decarbonization of transportation difficult. Our solution is adaptable to any engine, anywhere in the world.

The Environmental Benefits

  • Rapid Decarbonization: Our hydrogen retrofit solution allows us to quickly convert existing diesel engines to run on hydrogen, significantly reducing CO2 emissions without the need to replace the entire engine.
  • Cost-Effective and Scalable: By using existing engines and infrastructure, our solution is more affordable and easier to implement than buying new electric or fuel cell vehicles.
  • Thanks to the production of green electricity worldwide, we can generate storable energy (hydrogen) at a reduced cost across the globe. Additionally, the RH2 solution is suitable for emerging countries in terms of both price and maintenance.
  • Using Hydrogen instead of diesel : decrease C02 by 2,5Kg/km for a truck To Zero CO2
  • We use fewer natural resources to renovate than to build a new vehicle, and since we don't use rare earths or precious metals, and less energy consumption

The Financial Benefits

  • Price 3 times less than a battery solution ou fuel cell solution in the heavy mobility
  • Solution that will be used as usual. In the future, there will also be solid reservoirs (hydrogen will be stored in a medium)
  • Solution with a total operating cost comparable to diesel when price of kg of hydrogen is below €9/kg on with a total cost of ownership
  • The payback is less than Five years with the carbon Taxe. it will be the same if we compare with a new diesel Truck

Target client profile

Applications

Activity Region

  • Headquarters
  • Activity

Company Profile

Retrofit Hydrogene

Hywice concept of RH2 for a cheap, clean, and powerful engine running on hydrogen base on existing engine.

Headquarters 89000 Auxerre, France
Type Startup or self-employed
View company profile Solution website

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The information set out above, is solely for the purposes of information and the Solar Impulse Foundation does not provide any guarantee as to its authenticity, completeness or accuracy. This information does not constitute investment advice or a recommendation to buy into, transact or to enter into any agreement with any of the parties or persons mentioned above. Potential investors or interested parties are solely responsible for their investment or business decisions and for performing any due diligence required by the circumstances. The innovator Retrofit Hydrogene has asserted ownership of the intellectual property rights for images, videos, and content showcased above, affirming full and unrestricted usage rights, and has provided explicit permission for the Solar Impulse Foundation to publish such information designated as "public" in the application form.