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Clean Aviation Outlines Project Plan Featuring Three Key Initiatives

Clean Aviation Outlines Project Plan Featuring Three Key Initiatives
Clean Aviation has revealed a comprehensive project plan centered on three major initiatives aimed at advancing hybrid-electric propulsion and next-generation aircraft technologies. The plan, detailed in a draft of the organisation’s fourth call for proposals expected in February, includes a significant funding allocation from the European Union to support the development of ground demonstrators for hybrid-electric narrowbody powerplants. This initiative forms part of a broader research agenda targeting regional and narrowbody aircraft, hydrogen propulsion, and disruptive aviation technologies.
Funding Allocation and Strategic Focus
The European Union is set to provide €329.5 million in funding through Clean Aviation, with the objective of leveraging private sector contributions to reach a total research investment of €824 million. This funding will be distributed across five principal streams. The largest portion, €130 million, is dedicated to ultra-efficient short- to medium-range (SMR) aircraft architectures, supporting five projects. Hydrogen propulsion will receive €101 million for four projects, while €40 million is allocated to the development of ultra-efficient regional aircraft architectures through a single project. An additional €40 million is reserved for seven fast-track agile projects focusing on disruptive technologies, and €18.5 million will support four projects under transverse activities, including the development of certification standards.
Central to the plan is the hybrid-electric demonstrator initiative, which aims to develop a hybrid-electric propulsion sub-system integrated into an SMR engine, targeting service entry around 2035. Up to three projects will be selected, with flexibility for contractors to employ either ducted or unducted engine designs. Each project is required to reach technology readiness level (TRL) 5 by completion, demonstrating functional capabilities such as power extraction, injection, and transient-assist modes under relevant operational conditions.
Technological Ambitions and Industry Participation
Clean Aviation’s technology-agnostic approach allows for a broad range of potential participants, including major engine manufacturers such as Safran, Rolls-Royce, and MTU Aero Engines. Safran’s involvement could build on its CFM International joint venture, which is developing the RISE open-rotor engine incorporating hybrid-electric elements. MTU Aero Engines is expected to leverage its ongoing SWITCH project, which focuses on hybridising the Pratt & Whitney PW1100G engine. All technologies entering phase two of the programme must have achieved TRL 4 at the project’s outset.
The hybrid-electric propulsion architecture is expected to deliver at least a 5% reduction in fuel burn and CO2 emissions at the aircraft level. In addition to emissions targets, the projects must address critical challenges related to thermal management, energy efficiency, and control systems. Within the SMR stream, €40 million is specifically earmarked for the development and demonstration of a lightweight, aerodynamic rear fuselage and empennage. This effort aims to achieve an additional 2% reduction in CO2 emissions while validating advanced manufacturing techniques suitable for high-rate production.
In the regional aircraft segment, Clean Aviation plans to allocate €40 million for the development and demonstration of an advanced airframe encompassing the wing, fuselage, empennage, and key enabling systems. This initiative supports the hybrid-electric Ultra-Efficient Regional Aircraft (UERA) concept, where airframe innovations are expected to contribute approximately one-third of the targeted 30% reduction in CO2 emissions. Notably, three projects related to UERA development, including hybrid-electric engines, have already been selected for funding.
Challenges and Industry Context
Despite the ambitious scope of Clean Aviation’s plan, several challenges remain. Securing sufficient EU funding is a critical concern, particularly given competition from other aviation research initiatives. Market analysts have expressed skepticism regarding the feasibility of hybrid-electric ground demonstrators and the overall viability of the proposed technologies within the projected timelines. Furthermore, major aerospace competitors such as Airbus and Boeing are advancing their own sustainability strategies, which may divert industry focus and resources away from Clean Aviation’s initiatives.
The evolving industrial strategy of the European Commission for aviation also introduces uncertainty, as shifting funding priorities and regulatory frameworks could influence the trajectory of Clean Aviation’s projects. These factors collectively underscore the complex environment in which Clean Aviation seeks to drive innovation in sustainable aviation technologies.

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