Breakthrough in Hybrid-Electric Propulsion Systems
The University of Naples Federico II (UniNa) has published a significant advancement in sustainable aviation with their latest research titled "A mathematical model for hybrid-electric propulsion systems for regional propeller-driven aircraft". This work appears in the prestigious journal Energy Conversion and Management: X.
This innovative study introduces advanced mathematical modelling techniques aimed at improving the efficiency and environmental performance of hybrid-electric propulsion systems, paving the way for cleaner, more efficient regional air travel. Key Highlights:
- Advanced modelling of hybrid-electric systems
- Improved efficiency and performance metrics
- Potential for reduced environmental impact in aviation
Download the article here.
Figure1. Hybrid-electric powerplant architecture integrating three different power sources — thermal engines, fuel cell systems and battery — and two distinct propulsive lines
HERA Newsletter – Issue 1 is Out Now!
We are excited to announce the release of the first issue of the HERA Newsletter! In this first edition, you will get an inside look at:
- The mission and purpose behind the HERA initiative
- Our high-level goals for advancing aviation innovation
- The cutting-edge technologies driving the project forward
Download HERA Newsletter | Issue 1; stay informed and inspired and don’t forget to subscribe for future updates!
HERA’s Annual Review Meeting
The Clean Aviation HERA project has made significant strides in achieving its objectives and milestones, showcasing strong progress and alignment with its long-term vision. The M24 Review Meeting, held on April 1–2, 2025, at the University “Federico II” in Naples, brought together representatives from CAJU, EASA, external experts, and all 52 project partners, reflecting the collaborative strength behind this ambitious initiative.
The review focused on evaluating technical progress, the effectiveness of corrective actions, and the alignment of technology development with the target Entry Into Service (EIS) in 2035. The discussions were open and constructive, supported by comprehensive documentation and well-prepared presentations.
HERA stands out as a complex and highly integrated project, uniting 38 beneficiaries and multiple partners across the aviation sector. Its mission is to develop hybrid-electric aircraft concepts for regional aviation, targeting significant reductions in greenhouse gas emissions.
A major highlight of the review was the introduction of a new Ultra Efficient Regional Aircraft (UERA) use case, aimed at achieving a 30% CO₂ reduction with EIS in 2035. This concept, led by Leonardo with demonstrator support from ATR, is now a top priority. A second concept, the Ultra Clean Business (UCB) aircraft, targeting a 50% CO₂ reduction with EIS beyond 2035, is also under development by Airbus Defence and Space (ADS).
The updated action plan, presented during the review, includes a clear roadmap with revised GANTT charts, risk assessments, and key performance indicators. These updates were formalized in a Grant Agreement amendment signed in March 2025.
HERA continues to demonstrate high impact potential in the aviation sector, with its hybrid-electric aircraft concepts poised to redefine regional air travel. The project’s alignment with Clean Aviation’s strategic goals and its commitment to innovation and sustainability were strongly reaffirmed during the review.
Visit our photo gallery here.
UERA: Pioneering Hybrid-Electric Propulsion at the Paris Air Show 2025
Our latest advancements in propulsion and hybrid technology have been unveiled at this year’s Paris Air Show. As part of our mission to revolutionize regional air mobility, the Ultra Efficient Regional Aircraft (UERA) initiative is pushing the boundaries of innovation to deliver cleaner, more efficient flight solutions.
This next-generation platform integrates:
- Hybrid-electric propulsion for optimized energy use
- Sustainable performance to reduce environmental impact
- Future-ready technology designed to meet the demands of tomorrow’s aviation landscape
Subscribe to the HERA YouTube channel so you don't miss the video shown at the Paris Air Show.
The project is supported by the Clean Aviation Joint Undertaking and its members.
Funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or Clean Aviation Joint Undertaking. Neither the European Union nor Clean Aviation JU can be held responsible for them.