IN Brief:
- The Collins-led HECATE programme has completed ground testing of a hybrid-electric architecture rated above 500kW and reached TRL5.
- The work focuses on the industrial realities of high-voltage aerospace power: weight, power density, EMC, arcing, lightning resilience, and thermal management.
- While civil in funding, the technologies map closely to defence aircraft needs as onboard electrical demand rises across sensors, mission systems, and future propulsion architectures.
A Collins Aerospace-led consortium has completed ground testing of a hybrid-electric aircraft power system rated at more than 500kW, closing out the HECATE programme with a Technology Readiness Level 5 result and a clearer picture of what high-voltage aerospace electrification looks like when it moves beyond slides and into hardware. The test campaign used Safran Electrical & Power’s copper bird platform in Niort, giving the consortium a controlled but representative environment in which to validate a full electrical generation and distribution architecture.
On one level, HECATE sits squarely inside the civil aerospace push toward lower-emission regional aircraft. On another, it speaks directly to a problem defence aerospace knows well: every new capability seems to demand more electrical power, tighter thermal margins, and better electromagnetic discipline than the last. Once the architecture climbs into high-voltage territory, those problems cease to be incremental. They become design drivers.
That is why this result matters. HECATE was not about proving that electric components can be made to work in isolation. It was about showing that a distributed architecture can be validated as a system, with realistic attention to power density, lightning and arcing behaviour, electromagnetic compatibility, thermal loading, and the digital modelling needed to reduce development risk before flight integration. Those are not side issues. They are the industrial barriers that decide whether an aircraft power concept survives contact with certification and manufacturing.
The consortium itself also says something about where the work is heading. Collins led the steering committee, Safran coordinated technically, and Airbus Defence and Space and Leonardo were among the major participants. That mix reflects the increasingly blurred line between civil technology development and defence-relevant aerospace industrial capability, especially in electrical systems, controls, integration tools, and test infrastructure.
The industrial challenge is electrical, not conceptual
The aerospace sector has spent years discussing electrification in broad strategic language. The harder reality sits deeper in the production chain: converters, cabling, insulation systems, switchgear, fault protection, cooling, shielding, connectors, and software validation. Once power levels rise, every kilogram of hardware, every degree of temperature margin, and every stray electromagnetic effect starts to matter more.
That is why copper bird testing remains so important. It allows manufacturers to prove not just component performance, but interoperability, failure handling, and maintainability before those risks migrate into the aircraft itself. HECATE’s use of digital twins to shorten testing and support validation is significant here. The cost of building next-generation electric aircraft will be shaped as much by how quickly engineers can eliminate integration errors on the ground as by the final hardware bill.
Why defence manufacturers will watch closely
For defence aerospace, the relevance is obvious even if HECATE was not conceived as a military programme. Military aircraft are absorbing greater electrical loads from sensors, communications, electronic warfare systems, computing, autonomy, and thermal management. At the same time, future uncrewed and optionally crewed platforms are pushing designers toward lighter, more efficient, and more tightly managed onboard power architectures.
RTX has already said it is adapting commercial electric-power work for next-generation military aircraft, and that is the real bridge here. The same advances in high-voltage generation, distribution, and cooling that support hybrid-electric civil platforms also feed the longer defence trend toward more-electric aircraft. In practice, that means the industrial base able to build, shield, cool, and certify compact high-power systems will become more valuable across both markets.
HECATE does not solve that problem on its own, and TRL5 is still a long way from series production. Even so, it marks an important change in tone. The discussion is moving away from whether high-voltage architectures belong in future aircraft and toward who can manufacture them reliably, integrate them quickly, and scale them without losing control of safety and performance. In aerospace, that is usually when a technology starts to matter commercially. In defence, it is usually when primes begin to pay very close attention.
