PAS 2025: Ascendance to Unveil STERNA Hybrid Pack, Collaborates with EXOES “to Accelerate Industrialisation of Hybrid-Electric Aviation”
Ascendance Technologies, a European leader in hybrid aviation, will announce the launch of the STERNA Hybrid-Electric Propulsion System, at the 55th Paris Airshow next week, reports a press release.
The release explains, “This modular solution integrates a propulsion battery designed specifically for hybrid-electric aviation, an energy management system, and an electrical distribution unit. The system is engineered to combine performance, energy efficiency and compliance with stringent aviation certification requirements.”
Ascendance has partnered with EXOES, a French specialist in thermal systems and batteries for mobility.
Jean-Christophe Lambert, CEO of Ascendance, commented, “This collaboration demonstrates the consolidation of our hybridisation strategy. Since 2018, we have developed and tested our hybrid technologies leading to The Hybrid Pack.” Adding, “This is not a transitional technology. It is the foundation of a new generation of propulsion.”
The partnership is based on a shared vision to accelerate the industrialisation of certifiable, hybrid-electric propulsion solutions manufactured in France that meet the demanding standards of the aerospace and defence sectors.
The release continues, “These unique batteries power the STERNA Hybrid Pack and is a significant milestone for Ascendance, demonstrating its ability to produce and industrialise hybrid-electric propulsion systems in France.”
Meanwhile, EXOES contributes expertise in cell assembly, advanced thermal management and testing that offers robustness, reliability and compliance with aviation requirements.

Arnaud Desrentes, CEO of EXOES, remarked, “Since 2017, we have specialised in designing and manufacturing high-performance batteries with enhanced safety. Aerospace and defence are our top-priority markets. The partnership has already attracted our first customers and we’re eager to accelerate the market launch of our joint products and services.”
To be unveiled “exclusively” at the Paris Air Show, the STERNA Hybrid Pack, is modular and compact and can be easily integrated into a wide range of platforms, including VTOLs like ATEA, long-range drones, light helicopters and regional aircraft, to boost range, reduce emissions and enable a gradual transition to cleaner aviation.
The Pack offers dual charging capabilities:-
: In-flight for time savings and total independence from ground infrastructure.
: On the ground, to leverage existing networks when available.
This operational flexibility enables a wide range of use cases, such as medical or surveillance missions in remote areas, regional connections on short runways and logistics or tourism services in non-electrified regions.
For more information
(Top image: Ascendance)
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