RTX Leads EU Hybrid Electric Aviation Project for Regional Aircraft

RTX’s Pratt & Whitney Canada Leads Revolutionary Hybrid-Electric Aviation Initiative Through EU Clean Aviation Program

The aviation industry stands at a pivotal moment in its pursuit of sustainable flight technologies, with RTX Corporation’s Pratt & Whitney Canada division achieving a historic milestone by becoming the first Canadian company selected to lead a major European Union Clean Aviation program. The PHARES (Powerplant Hybrid Application REgional Segment) project represents a groundbreaking €69 million initiative targeting up to 20% fuel efficiency improvements for regional aircraft through innovative Electric-Aviation propulsion systems. This development positions RTX at the forefront of the aviation industry’s ambitious decarbonization efforts, leveraging cutting-edge technology to address mounting environmental pressures while maintaining operational viability in an increasingly regulated global market.

As aviation faces increasing scrutiny over its environmental impact, the PHARES project is not just a technological leap but also a strategic move in a sector under pressure to meet climate targets. The collaboration between RTX, Collins Aerospace, ATR, and Airbus underscores the necessity for cross-border, cross-industry partnerships to achieve the ambitious goals set by regulatory bodies and market expectations. This initiative also highlights the growing role of hybrid-electric propulsion as a bridge between conventional aircraft and a more sustainable future, demonstrating both immediate and long-term benefits for regional aviation.

With significant funding from the European Union’s Clean Aviation program and a clear mandate to demonstrate commercial viability by 2035, PHARES is emblematic of the broader transformation underway in aerospace. The project’s success could set a precedent for international cooperation and technology transfer, shaping the future of sustainable aviation worldwide.

The Clean Aviation Program and European Sustainability Mandate

The Clean Aviation Joint Undertaking is the EU’s flagship research and innovation program for sustainable flight, established under the European Green Deal. With a total budget of €4.1 billion, €1.7 billion from the EU and at least €2.4 billion in private investments, the program aims to cut emissions from short-medium range and regional aircraft by at least 30% compared to 2020 technology. This effort is part of a broader strategy to achieve climate neutrality by 2050.

The program’s objectives, outlined in Council Regulation (EU) 2021/2085, focus on integrating disruptive aircraft technologies to reduce net greenhouse gas emissions by at least 30% by 2030, compared to the 2020 state-of-the-art. The September 2025 funding round allocated €945 million ($1.1 billion) to twelve projects, including €378 million from the EU, reflecting a strong commitment to maintaining leadership in sustainable aviation technologies.

Clean Aviation’s approach covers four aircraft concepts: ultra-efficient regional aircraft, two Hydrogen-powered variants, and ultra-efficient short/medium-range aircraft. This diversity ensures that innovation is spread across different market segments, recognizing that no single solution will address all sustainability challenges. The program’s focus on commercial readiness by 2035 distinguishes it from more theoretical research, requiring funded projects to demonstrate both technical feasibility and practical implementation.

“These projects have high potential to make major advancements towards climate neutrality and sustainability.” — Alex Krein, Executive Director, Clean Aviation Joint Undertaking

Strategic Importance and Funding Structure

The Clean Aviation program’s substantial budget is designed to leverage private sector resources, distributing financial risk and ensuring broad industry participation. The latest funding round’s focus on projects like PHARES signals the EU’s intent to stimulate rapid progress in key technological areas, particularly hybrid-electric propulsion for regional aircraft.

By setting clear targets and timelines, Clean Aviation provides a framework that encourages both innovation and accountability. The requirement to achieve entry into service by 2035 ensures that research efforts are closely aligned with market needs and regulatory expectations, fostering a sense of urgency that is often lacking in large-scale research initiatives.

This structure also facilitates international collaboration, as seen in the inclusion of North-American partners following a bilateral agreement between Canada and the EU. Such partnerships are crucial for pooling expertise and accelerating the development of complex systems like hybrid-electric propulsion.

Alignment with Broader Climate Goals

Clean Aviation is part of the EU’s response to the growing climate crisis, aligning with broader policies under the European Green Deal. The program’s emphasis on measurable emissions reductions and commercial viability reflects a shift from aspirational goals to actionable strategies, with clear benchmarks for progress.

The integration of public and private funding ensures that innovations developed under Clean Aviation have a clear path to market, reducing the risk of promising technologies stalling due to lack of investment. This approach also encourages companies to align their R&D efforts with regulatory and market trends, increasing the likelihood of widespread adoption.

By fostering a collaborative ecosystem, Clean Aviation aims to maintain the EU’s leadership in sustainable aviation while setting standards that could influence global practices. The program’s success will likely serve as a model for other regions seeking to balance economic growth with environmental responsibility.

RTX Corporation and the PHARES Project Leadership

RTX Corporation’s selection to lead the PHARES consortium is a historic achievement, marking the first time a Canadian company has headed a Clean Aviation initiative. This follows the 2024 bilateral agreement between Ottawa and the EU, which opened the door for Canadian participation. RTX brings together Pratt & Whitney Canada, Collins Aerospace, ATR, and Airbus in a transatlantic partnership that exemplifies the global nature of sustainable aviation development.

The PHARES project focuses on developing a hybrid-electric propulsion demonstrator that combines a PW127XT-derivative turboprop engine with a 250 kW electric motor from Collins Aerospace, integrated via an optimized propeller gearbox. This configuration is designed to achieve significant efficiency improvements while maintaining the reliability required for commercial operations.

Maria Della Posta, President of Pratt & Whitney Canada, stated, “Hybrid-electric propulsion and electrified aircraft systems are key parts of RTX’s technology roadmap for optimizing performance and enhancing fuel efficiency across multiple future aircraft platforms.” This underlines PHARES as a central component of RTX’s broader strategy, not just an isolated research project.

“Hybrid-electric propulsion and electrified aircraft systems are key parts of RTX’s technology roadmap for optimizing performance and enhancing fuel efficiency across multiple future aircraft platforms.” — Maria Della Posta, President, Pratt & Whitney Canada

Consortium Structure and Collaboration

The PHARES consortium leverages the strengths of its partners: Pratt & Whitney Canada’s propulsion expertise, Collins Aerospace’s electrical systems, and the manufacturing and operational experience of ATR and Airbus. This structure ensures that innovations developed through PHARES can be rapidly transitioned from demonstration to commercial application.

Such collaboration is essential for tackling the complex challenges of hybrid-electric propulsion, which requires seamless integration of mechanical and electrical systems. The consortium model also facilitates knowledge transfer and risk-sharing, enabling more ambitious technical targets than would be possible for any single company.

The €69 million funding for PHARES supports not only technology development but also the extensive testing and validation needed to meet certification and commercial readiness standards. This investment reflects the high stakes and potential rewards associated with leading the next generation of regional aircraft propulsion.

Technical Scope and Innovation

The PHARES demonstrator will integrate an advanced PW127XT-derivative engine with a 250 kW electric motor, using a propeller gearbox optimized for hybrid operation. This architecture allows dynamic power management, enabling both thermal and electric sources to be used optimally during different flight phases.

Collins Aerospace’s electric motor technology is based on scalable platforms, with the 250 kW motor being a derivative of its 1 MW flagship. This ensures that the system can be adapted for various aircraft sizes and applications, enhancing its commercial potential.

The project also includes development of an advanced propeller system, leveraging electric motor assistance for more precise torque control and efficiency. This holistic approach addresses not just propulsion but also overall aircraft performance and noise reduction.

Technical Innovation and Hybrid-Electric Propulsion Architecture

The hybrid-electric propulsion system at the core of PHARES represents a sophisticated blend of conventional and emerging technologies. The integration of a proven turboprop engine with a high-efficiency electric motor enables dynamic power sharing, optimizing fuel use and emissions across different flight stages.

During high-demand phases like takeoff, both the engine and motor operate together, allowing the thermal engine to be sized for cruise efficiency rather than peak power. This strategy addresses a key inefficiency in traditional aircraft, where engines are often overpowered for most operational needs.

Thermal efficiency improvements in the PW127XT derivative engine complement the hybrid architecture, further reducing fuel consumption. The electric motor’s precise control capabilities enable new propeller designs, improving efficiency and potentially reducing noise, an important consideration for regional operations.

“The 1 MW motor delivers four times the power and twice the voltage of Collins’ most advanced electric motor generators in service, while achieving half the heat loss and half the weight.” — Collins Aerospace

System Integration and Testing

RTX’s dual expertise in propulsion and electrical systems streamlines the integration process, reducing technical and commercial barriers. The company’s hybrid-electric flight demonstrator program, using a modified Dash 8-100, has already achieved full-power testing, validating key aspects of the PHARES architecture.

The demonstrator combines a highly efficient thermal engine, a 1 MW electric motor, and advanced battery systems, providing critical data for certification. The use of existing aircraft platforms for testing accelerates development timelines and reduces certification complexity.

Collins Aerospace’s “The Grid” laboratory, a $50 million investment, supports the development and testing of electric motors and power distribution systems. This facility is among the most advanced in the industry, enabling rapid prototyping and validation of new technologies.

Scalability and Future Applications

The modular nature of the hybrid-electric system developed for PHARES allows it to be adapted to different aircraft types, from regional planes to rotorcraft. RTX’s collaboration with Airbus Helicopters on the PioneerLab technology demonstrator extends these innovations to the rotorcraft sector, showcasing the versatility of the technology.

Projects like SWITCH, which focus on hybridizing larger engines for single-aisle aircraft, demonstrate the scalability of RTX’s approach. By developing a family of electric motors ranging from 250 kW to 1 MW, Collins Aerospace ensures that the technology can meet the needs of various market segments.

The integration of high-voltage electrical distribution systems, such as those developed in the HECATE project, addresses critical infrastructure requirements for hybrid-electric aircraft, supporting both propulsion and onboard systems.

Market Context, Financial Implications, and Industry Partnerships

The regional aircraft market is particularly well-suited for hybrid-electric propulsion, given its shorter routes and frequent takeoff/landing cycles. Clean Aviation’s Ultra-Efficient Regional Aircraft concept targets aircraft with 50-100 seats and design ranges up to 500 nautical miles, aligning with typical regional operations.

Market projections for hybrid-electric aircraft are robust, with estimates ranging from $2.80 billion in 2023 to as much as $465.60 billion by 2050. North America currently leads in market share, but European initiatives like Clean Aviation are rapidly closing the gap. The sector’s growth is driven by regulatory pressures, cost-saving potential, and increasing demand for environmentally friendly travel.

RTX’s financial stability, evidenced by $80.8 billion in adjusted sales and a $218 billion backlog in 2024, supports its ability to invest in long-term technology development. Public-private funding models, such as those used in Clean Aviation, help de-risk innovation and encourage broader industry participation.

“The global hybrid electric aircraft market is projected to grow at a compound annual rate of over 21% through 2050.” — Verified Market Research

Industry Partnerships and Technology Transfer

Collaboration is central to Clean Aviation’s strategy, with consortia like PHARES bringing together established manufacturers and specialized technology firms. ATR’s parallel projects, such as HERACLES and DEMETRA, aim to fly the world’s first hybrid-electric regional aircraft by 2030, providing a clear timeline for market entry.

Partnerships with academic institutions and startups enhance innovation and provide access to specialized expertise. For example, Collins Aerospace conducts motor testing at the University of Nottingham, while H55 S.A. supplies batteries for RTX’s demonstrator programs.

International cooperation, facilitated by regulatory alignment between the EU and Canada, ensures that innovations developed under Clean Aviation can be commercialized in multiple markets. This approach reduces barriers to adoption and maximizes the impact of new technologies.

Regulatory and Sustainability Landscape

The integration of hybrid-electric propulsion with SAF capabilities amplifies emissions reductions, with SAF offering up to 80% lower lifecycle emissions compared to conventional fuel. Regulatory mandates in Europe require increasing SAF usage, creating favorable conditions for aircraft optimized for both hybrid propulsion and SAF compatibility.

Certification of hybrid-electric aircraft presents new challenges, requiring coordination between electrical and propulsion standards. Regulatory agencies are developing frameworks to address these complexities, with ground and flight testing providing essential data for approval.

The success of Clean Aviation and similar programs will likely influence global standards, encouraging harmonization and facilitating technology transfer across regions. This regulatory environment supports the rapid adoption of sustainable aviation technologies.

Conclusion

RTX’s leadership of the PHARES project marks a transformative step in the evolution of sustainable aviation. By integrating advanced hybrid-electric propulsion technologies within a collaborative, international framework, RTX and its partners are setting new standards for efficiency, emissions reduction, and commercial viability in regional aviation.

The success of PHARES and related initiatives will have far-reaching implications, serving as a model for future public-private partnerships and international cooperation in aerospace. As the industry moves toward the 2035 commercial readiness target, continued investment, innovation, and regulatory alignment will be crucial for achieving the ambitious goals of climate-neutral flight and maintaining global competitiveness.

FAQ

What is the PHARES project?
PHARES (Powerplant Hybrid Application REgional Segment) is a hybrid-electric propulsion development initiative led by RTX’s Pratt & Whitney Canada, in collaboration with Collins Aerospace, ATR, and Airbus, under the EU Clean Aviation program. It aims to improve fuel efficiency in regional aircraft by up to 20%.

Why is hybrid-electric propulsion important for aviation?
Hybrid-electric propulsion reduces fuel consumption and emissions by combining traditional engines with electric motors, optimizing power use during different flight stages. This is especially beneficial for regional aircraft with frequent takeoff and landing cycles.

What is the timeline for commercial deployment?
The Clean Aviation program targets entry into service for hybrid-electric regional aircraft by 2035, with demonstrator projects and flight testing planned throughout the late 2020s and early 2030s.

How is the PHARES project funded?
PHARES receives €69 million in funding from the Clean Aviation program, part of a broader €4.1 billion budget combining EU and private sector investments.

What companies are involved in the PHARES consortium?
The consortium includes RTX’s Pratt & Whitney Canada and Collins Aerospace, as well as ATR and Airbus, representing a blend of propulsion, electrical systems, and aircraft manufacturing expertise.

Sources

• RTX Newsroom
• Clean Aviation Joint Undertaking