Hyliion Demonstrates Seamless Multi-Fuel Transition in KARNO Reactor

Hyliion Holdings announced the demonstration of an uninterrupted multi-fuel transition in its next-generation KARNO reactor design, capable of handling liquid and gaseous fuels seamlessly. Operating without any hardware changes, the system transitioned through natural gas, hydrogen, diesel, and back to natural gas in a continuous sequence. The demonstration validates Hyliion's integrated reactor architecture, in which gaseous and liquid fuel pathways are unified within one system rather than across specialized hardware configurations. Earlier KARNO milestones validated each fuel category on reactor designs optimized for that fuel type. This unified design, which adds to Hyliion's extensive intellectual property portfolio, is the platform through which the Company is realizing its long-standing vision of true fuel-agnostic capability. The demonstration, performed in Hyliion's lab using an optical reactor configuration, enables direct visual observation of fuel behavior and provides engineering teams with real-time insight into reaction characteristics across fuel types. This capability supports continued refinement of the controls software that automatically detects fuel composition and adjusts operating parameters during transitions. "True fuel agnostic capability is not a feature added to a Power Module. It has to be designed into the product architecture from the foundation," said Thomas Healy, CEO. "When we acquired the KARNO technology, the long-term plan has always been to achieve a single architecture capable of operating across the full fuel spectrum. This demonstration confirms we are on the right path."