Carnot has tested its engine using biodiesel, marking the third fuel to be demonstrated on the same engine architecture, with liquefied petroleum gas (LPG) testing said to be forthcoming.

The company, which is developing what it describes as a multi-fuel engine technology, previously conducted tests using diesel and hydrogen. According to Carnot, biodiesel has now been added to that list without requiring changes to the fundamental engine architecture.

Carnot noted that fuel flexibility is central to the technology it is developing. The ability to operate across different fuels without altering the core engine design is positioned by the firm as a potential solution for industries navigating the transition towards lower-carbon energy sources — where fuel availability, infrastructure and requirements can vary significantly between applications.

Biodiesel, a renewable alternative to conventional diesel, can be used with existing liquid-fuel infrastructure, making it an option for operators seeking to reduce reliance on fossil fuels without the need for significant capital investment in new supply chains. Carnot says the latest tests demonstrate how its technology could support customers transitioning towards alternative fuels without being dependent on a single fuel pathway.

The company has indicated that engine demonstrations will be made available to prospective customers next year.