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Clean Aviation Grant Advances Ascendance and L.I.M.E Consortium

Clean Aviation Grant Advances Ascendance and L.I.M.E Consortium
European Consortium Secures €5 Million to Propel Hybrid-Electric Aviation Technologies
Paris, September 9, 2025 — The L.I.M.E project (Lithium-based Innovation for Modular Energy), spearheaded by Ascendance in collaboration with EXOES, Basquevolt, and the Chair of Production Engineering of E-Mobility Components (PEM) at RWTH Aachen University, has been awarded a €5 million grant under Europe’s Clean Aviation program. This significant funding places the consortium at the forefront of Europe’s ambitious efforts to develop sustainable aviation technologies, specifically focusing on next-generation hybrid-electric propulsion systems.
The grant, granted following a rigorous and competitive selection process, reflects robust support from leading aircraft manufacturers operating under CS-25 and CS-23 certification standards. It underscores the industry’s confidence in Ascendance’s hybrid-electric propulsion innovations. The L.I.M.E initiative aims to develop an aviation-grade battery system tailored for hybrid-electric propulsion, with a particular emphasis on regional aircraft such as the ATR 42/72. The project targets commercial entry into service by 2035.
Jean-Christophe Lambert, CEO of Ascendance, expressed his appreciation for the endorsement: “We’re honored by Clean Aviation’s decision and the trust expressed by the sector and our consortium partners. Their support affirms both Ascendance’s expertise and the market’s belief in the STERNA Hybrid Pack as a catalyst for cleaner air transport.”
Project Objectives and Strategic Focus
The L.I.M.E project is structured around six principal objectives designed to advance battery technology and integration for aviation applications. These include ensuring safety and end-user-centric design that complies with stringent aviation certification requirements, particularly for CS-25 applications. The consortium is committed to pushing the boundaries of battery innovation, enhancing cell performance, thermal management, and developing advanced composite casings.
A key milestone involves the manufacturing and testing of a Technology Readiness Level 4 (TRL4) prototype, encompassing cell blocks, battery management systems, and thermal regulation components, followed by comprehensive ground demonstrations. The project also leverages high-fidelity digital twin technology to optimize development processes, reduce costs, and accelerate design validation.
In parallel, the consortium is preparing a detailed roadmap to facilitate the integration and industrialization of the battery system, aiming for commercial deployment by 2035. Dissemination of research findings and results is intended to maximize the European impact, reinforcing the continent’s technological leadership, economic growth, and competitiveness in the sustainable aviation sector.
Challenges and Industry Context
Despite the promising outlook, the L.I.M.E Consortium faces a complex and competitive environment. Traditional aerospace manufacturers are intensifying their innovation efforts and forging strategic partnerships to maintain market share in the evolving landscape. The consortium must also navigate potential obstacles related to taxation, tariffs, and the ongoing competition for highly skilled talent within the rapidly transforming aviation industry.
Industry analysts highlight that shifting technologies and regulatory frameworks are poised to reshape market dynamics, compelling both established and emerging players to adapt swiftly. The consortium’s success will depend heavily on its ability to attract and retain top-tier expertise, effectively manage regulatory challenges, and sustain technological advancement.
Lambert emphasized the importance of collaboration, stating, “The complementarity of skills and expertise with our partners EXOES, Basquevolt, and PEM at RWTH Aachen University is key to achieving these technical objectives and contributing to the aviation sector’s energy transition. For Ascendance, this grant is a strong signal of confidence in our vision for cleaner, more sustainable air transport.”
With the support of the Clean Aviation grant, the L.I.M.E Consortium is well-positioned to play a pivotal role in shaping the future of European aviation, even as it contends with the sector’s evolving challenges and opportunities.

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