AUSTIN, Texas–(BUSINESS WIRE)–Hyliion Holdings Corp. (NYSE American: HYLN) (“Hyliion”), a developer of sustainable, electricity-producing technologies, today announced the successful completion of the first phase of extensive performance testing evaluating the KARNO™ technology on a representative U.S. Navy load profile. This marks a significant milestone in demonstrating the system’s load-following capability, reliability, and endurance as part of a development program funded by the Office o