H55 SA

H55 is a Swiss-based company specializing in certified electric propulsion and certification-grade energy storage systems for the aviation industry. Founded as a technological legacy of the Solar Impulse program, its mission is to accelerate the transition to electric aviation by providing solutions that make air transport clean, quiet, safe, and affordable. The company's headquarters are located in Sion, Switzerland.

H55's core offerings include electric propulsion systems and energy storage systems (ESS), which encompass battery packs and battery management systems. These solutions are designed to be modular, lightweight, and certifiable, enabling the electrification of various aircraft types, including existing airplanes, new designs for commuters, sTOL, and eVTOL. The company focuses on developing certification-grade energy storage that is predictable, provably safe, and trusted by authorities, insurers, and original equipment manufacturers (OEMs).

In recent developments, H55 successfully completed System Safety Function Verification Testing of its integrated Energy Storage System in April 2026, a significant step towards certification. The company also completed EASA final certification testing requirements for its propulsion battery pack by the end of 2024, with battery packs expected to be ready for integration into small aircraft by early 2025. Co-founded by André Borschberg, Sébastien Demont, and Gregory Blatt, with Martin Larose serving as CEO, H55 is expanding its North American operations with a new manufacturing facility in Quebec, Canada, and was recognized by Fast Company as one of the World's Most Innovative Companies of 2025 in the transportation category.