Hyliion Holdings Corp. is promoting its KARNO generator as a more efficient and cost-effective alternative to Bloom Energy's fuel cells. CEO Thomas Healy emphasizes that KARNO offers lower maintenance costs and can run on over 20 different fuels, providing flexibility in changing energy markets. Healy points out that fuel cells typically require costly replacements every four to five years, which can be a significant financial burden. In contrast, KARNO's maintenance intervals are longer and less expensive, making it a more economical choice over time. Healy believes that this technology can help customers future-proof their energy systems, particularly as hydrogen emerges as a potential fuel source. The KARNO generator, based on Stirling engine technology and developed through 3D printing, was acquired from GE Additive for $37 million. The technology is currently being tested by the U.S. Navy for use in autonomous vessels. Despite the advantages, Healy acknowledges that Hyliion is a new player in the market, needing to prove its technology against established fuel-cell providers.