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§ Private Profile · Sion, Valais, Switzerland
Develops certified electric propulsion systems and energy storage for aircraft manufacturers, enabling electric aviation.
H55 has raised $144.4M across 3 funding rounds.
Key people at H55.
H55 has raised $144.4M in total across 3 funding rounds.
Founded in early 2017 by André Borschberg, Sébastien Demont, and Gregory Blatt, H55 is a technological spinoff of the Solar Impulse program, based in Sion, Switzerland. The company develops certified electric propulsion systems and energy storage solutions for aircraft manufacturers, enabling commercial aviation to transition away from carbon-intensive fuels. H55 specializes in transforming commercial lithium cells into aviation-safe battery systems that meet stringent regulatory standards, ensuring their safe and reliable deployment across multiple aircraft programs. Demonstrating robust reliability, H55 has successfully accumulated over 2,000 hours of fully electric flight with zero battery-related incidents. This proven technology includes a 100kW system utilized by BRM Aero for its B23 Energic two-seater trainer aircraft, which completed its first flight in June 2019 and is expected to begin deliveries in 2026.
H55 has raised $144.4M across 3 funding rounds. Most recently, it raised $72.9M Series C in July 2024.
| Date | Round | Lead Investors | Other Investors | Status |
|---|---|---|---|---|
| Jul 24, 2024 | $72.9M Series C | — | — | Announced |
| Sep 27, 2023 | $49.1M Series C | — | — | Announced |
| Dec 4, 2020 | $22.4M Venture Round | — | — | Announced |
H55 is a Swiss aerospace technology company building certified electric propulsion systems for the aviation industry. The company develops integrated electric powertrains—including high-performance battery systems, electric motors, and intelligent battery management systems (BMS)—for fixed-wing aircraft, STOL platforms, and eVTOLs. Its systems are designed to be scalable and ready for real-world deployment, enabling both retrofits of existing aircraft and integration into new electric and hybrid-electric designs.
H55 serves aircraft OEMs, component manufacturers, and operators in general aviation, flight training, and regional air mobility. It solves the critical challenge of decarbonizing aviation by replacing fossil-fuel-dependent propulsion with clean, quiet, and efficient electric systems that meet rigorous aviation safety and certification standards. With strong growth momentum—including Series C funding, partnerships with major aerospace players like Pratt & Whitney Canada, De Havilland, CAE, and Piper Aircraft, and demonstration of its B23 Energic electric trainer—H55 is positioning itself as a foundational enabler of sustainable flight.
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H55 was founded in 2017 in Sion, Switzerland, as a direct spin-off from the Solar Impulse project, the pioneering solar-powered aircraft initiative that circumnavigated the globe without fuel. The company was co-founded by André Borschberg (Solar Impulse’s co-founder and pilot), Sébastien Demont, and Gregory Blatt, who brought together deep expertise in aerospace engineering, systems integration, and sustainable aviation.
The idea emerged from the realization that the advanced energy storage, power management, and lightweight electric propulsion technologies developed for Solar Impulse could be adapted into certified, scalable solutions for broader aviation use. Rather than remaining a one-off demonstration, the team sought to industrialize this technology into commercially viable electric propulsion systems. Early traction came through flight demonstrators and strategic partnerships, culminating in EASA approval of its battery system in early 2024 and the launch of its first customer application: the BRM Aero B23 Energic electric trainer.
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Certified, Aviation-Grade Systems- H55 focuses on *certified* electric propulsion and battery systems, not just prototypes, enabling real-world adoption in regulated environments.- Its battery modules feature a 200 Wh/kg energy density, modular architecture up to 1250V, and are designed for 1,500 flight hours, making them suitable for commercial operations.
Integrated, Full-Stack Propulsion- Offers complete electric propulsion systems (EPS) with motors, inverters, and battery packs, plus full aircraft integration support.- Proprietary Battery Management System (BMS) with redundant analog and digital monitoring, thermal management, and connectivity to aircraft control systems.
Regulatory & Safety Leadership- Designed from the ground up to meet aviation safety standards (EASA, FAA), accelerating certification paths for OEMs.- Uses tools like PTC’s Codebeamer for traceable, safety-critical software development, streamlining compliance.
Strategic Partnerships & Scalability- Selected by CAE and Piper Aircraft for the electric conversion of the Piper Archer, targeting flight schools.- Supplying battery systems for Pratt & Whitney Canada’s hybrid-electric Dash 8 demonstrator, signaling credibility in regional aviation.- Expansion into Canada and France with local manufacturing and R&D hubs to serve North American and European markets.
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H55 sits at the intersection of three powerful trends: the urgent need to decarbonize aviation, the maturation of battery and power electronics technology, and the rise of advanced air mobility (AAM) and regional electric aircraft. Aviation accounts for a growing share of global emissions, and regulators, airlines, and training organizations are under pressure to adopt cleaner alternatives. H55’s timing is critical: it is delivering certified, scalable electric propulsion just as the industry moves beyond concept vehicles toward commercial deployment.
By focusing on general aviation and regional aircraft first—where operational profiles (shorter routes, frequent takeoffs/landings) are well-suited to current battery capabilities—H55 is de-risking the transition to electric flight. Its work with flight schools (via the B23 Energic) creates an early, high-volume use case that can drive down costs and build pilot familiarity with electric aircraft. At the same time, its involvement in hybrid-electric regional programs positions it as a key supplier for the next generation of sustainable commercial aircraft.
H55 is not just building components; it is helping to define the infrastructure and standards for electric aviation, influencing how OEMs design, certify, and operate electric aircraft. In doing so, it is accelerating the entire ecosystem’s readiness for sustainable flight.
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H55 is poised to become a core supplier in the emerging electric aviation value chain. In the near term, its focus will be on scaling production, achieving final regulatory approvals for its systems, and ramping deliveries of the B23 Energic and other STC-based conversions for flight schools and general aviation operators. The next 2–3 years will likely see broader adoption of its propulsion systems across training fleets in Europe, North America, and beyond.
Looking further ahead, H55’s technology could play a central role in hybrid-electric regional aircraft and eVTOL programs, especially as battery energy density improves and certification frameworks evolve. Strategic expansion in Canada and France, combined with strong government and industrial partnerships, gives it a solid platform for global growth.
As the aviation industry faces increasing pressure to reduce emissions and noise, H55’s mission—to make electric flight safe, scalable, and commercially viable—is more relevant than ever. Its journey from Solar Impulse’s experimental flights to certified, in-service electric propulsion systems exemplifies how visionary engineering can transition from proof-of-concept to real-world transformation.
Key people at H55.
H55 has raised $144.4M in total across 3 funding rounds.