VoltAero Ran Out of Runway With an EIC Accelerator Hybrid Plane

VoltAero set out to build a family of hybrid-electric aircraft for regional flights of 100 to 1,000 kilometres, with electric motors for take-off and landing and a combustion engine as a range extender. In the European Innovation Council's Green Deal cut-off of May 2020, the company from western France was selected for blended finance, and the EU signed a grant of €2,137,824.50 towards CASSIO, a €3,054,035 project that ran from 1 December 2020 to 30 June 2023, according to CORDIS. At the time it said it aimed for "type certification and service entry by early 2023", AIN reported.

That date was never met. On 7 October 2025 the commercial court of La Rochelle opened receivership proceedings (redressement judiciaire), fixing the date on which VoltAero stopped paying its debts at 25 September 2025, according to the official BODACC notice. On 23 June 2026 the court approved a sale plan and converted the case into liquidation (BODACC, BODACC). The same day Toulouse aircraft maker Aura Aero announced that it had acquired VoltAero's assets, according to its press release.

What Is Left of VoltAero

The company still exists on paper: the national register lists VoltAero as an active legal unit with its seat at Rochefort airport, according to the French company directory, but it is in judicial liquidation, with a liquidator in Rochefort and the court administrator kept on only to sign the sale deeds and dismiss the staff the buyer did not take over, according to the liquidation notice. Its website now carries an "Aura Aero acquires VoltAero" banner, and its last news item dates from July 2025, according to the VoltAero site.

Aura Aero says it bought VoltAero's patents, engineering know-how, prototyping capacity, the Rochefort site with direct runway access and "part of VoltAero's team", plus the Cassio S demonstrator, which had made more than 270 flights since flight testing began in 2019 (Aura Aero, Pulse 2.0). Wikipedia dates the first flight of the modified hybrid testbed to 10 March 2020 instead (Wikipedia). The price was not disclosed (CompositesWorld). In September 2026 Aura Aero flew the demonstrator again at Rochefort as X-VOLT, a testbed for the propulsion of its own 19-seat regional aircraft, ERA, according to Aerospace Testing International. Aura Aero's announcement names its Integral trainer, the ERA and the Enbata drone as the programmes the assets will support; it does not mention continuing the Cassio 330.

The Technology: Electric for Take-off, Fuel for Range

Battery-only aircraft are limited by the weight of their batteries. VoltAero's answer was a hybrid: electric motors drive the propellers during taxi, take-off and landing, quietly and without local emissions, and a combustion engine recharges the batteries in cruise, according to the company's description of the Cassio 330 production design. The CORDIS objective promised a 600 kW system with a range of up to 1,200 km and 3.5 hours of endurance, three models from four to ten seats, and fuel savings from 20% in heavy-hybrid mode to 100% in pure electric flight (CORDIS).

The design changed more than once. The 2020 plan was a parallel hybrid with motor and engine on one propeller and a twin-boom tail. In June 2025 VoltAero presented a series hybrid with two Safran ENGINeUS electric motors on the rear fuselage and a T-tail, which it said would simplify certification under EASA's CS-23 rules (VoltAero, Wikipedia). The company's own specification sheet gives the production Cassio 330 a 2,500 kg maximum take-off weight, a 40 kWh battery, a 260 kW thermal engine and a 1,200 km range without reserve (VoltAero). None of these figures was demonstrated on a production-standard aircraft.

CASSIO: What CORDIS Shows

The European Commission's list of the May 2020 EIC Accelerator pilot winners names VoltAero of Médis alone for CASSIO, with blended finance; no other company is listed for the project. When the award was announced, the EIC earmarked an equity portion of up to €11 million on top of the grant (AviTrader, AIN). VoltAero does not appear among the 319 organisations on the EIC Fund's list of invested companies (all 16 pages checked on 15 October 2026), and no announcement of an EIC equity investment could be found, so whether the equity was ever paid could not be verified.

The project's final periodic report, covering September 2021 to June 2023, lists engineering work: a completed "COR milestone" for the airframe, a new three-surface aerodynamic design with CFD analysis and a wind tunnel model, selection of suppliers for the main systems, top-level aircraft requirements, systems integration studies, a performance model and operating-cost comparisons with trains and cars. It also credits the project with a flying 600 kW hybrid power module and flight demonstrations of the patented series and parallel hybrid concept. It reports no certification step completed and no aircraft built to production standard.

1. Hybrid propulsion validated in flightDeliveredDemonstrator flown more than 270 times, per Aura Aero; flight demonstrations listed in the CORDIS report.
2. Cassio airframe and aerodynamics designDeliveredCOR milestone, wind tunnel tests and supplier selection reported on CORDIS.
3. Cassio 330 prototype in flightNot achievedShown in June 2023 with a first flight targeted that year (AVweb); in October 2025 the first conforming prototype was still awaiting assembly (AIN).
4. Airworthiness certificationNot achievedEASA process opened October 2021 (electrive); target moved from early 2023 to the end of 2027 (AIN); no certificate.
5. Production aircraft and deliveriesNot achievedPlant inaugurated in November 2024 (VoltAero); no aircraft delivered before liquidation.

The engineering work the grant paid for is documented and the demonstrator flew. The outcome that would have made CASSIO a product, a certified aircraft, did not come within the project or in the three years after it. CASSIO is rated partly delivered.

What VoltAero Built After the Award

The largest round followed in November 2022, when VoltAero announced the first tranche of a Series B worth €32 million, led by the Italian group Tecnologie e Servizi Innovativi (TESI), which was also to build the airframe of the first Cassio 330 prototype, to pay for certification and the production launch (electrive, Revolution.Aero, which gives the figure in dollars). Kawasaki was described as a strategic investor in 2023 (AIN). How much of the €32 million was actually paid in cannot be verified from public filings. The Nouvelle-Aquitaine region was one of VoltAero's original financial backers, the company said in 2025 (VoltAero).

The money went into a factory and a sales pipeline. In November 2024 VoltAero inaugurated a 2,400 m² final assembly site and headquarters at Rochefort airport, sized for 150 aircraft a year (VoltAero). In June 2025 it signed an agreement with Malaysia's HM Aerospace for 15 Cassio 330s plus 15 options and said its backlog stood at more than 280 "orders, agreements and commitments" (VoltAero, KITPLANES). The HM Aerospace deal was conditional on EASA certification. It also launched the HPU 210, a hybrid power unit for kit-built aircraft, and opened reservations for it in July 2025; no deliveries were announced.

The Money and the Collapse

VoltAero's filed accounts show net losses every year, rising from €29,757 in 2019 to €3,118,073 in 2023 and €2,745,072 in 2024, a total of €10.53 million, according to the INPI accounts dataset; the 2024 figure also appears in the French company directory. The accounts are filed with parts kept confidential, so revenue and staff costs are not public.

The end came from a funding gap. In July 2025 VoltAero signed a letter of intent with SEDC Energy, an entity of the Malaysian state of Sarawak, and France's ACI Groupe for a Cassio assembly centre in Sarawak, with both expressing interest in taking an equity stake (VoltAero). ACI was to put in about €5 million, but went into court proceedings itself on 25 September 2025; together the two investments, about €10 million, were meant to carry VoltAero through Cassio 330 certification, which had been expected by the end of 2027 (AIN). VoltAero, then with 35 staff, entered receivership two weeks later (L'Info Durable, KITPLANES).

Botti told the same outlet that the French state and the Nouvelle-Aquitaine region were helping, "but not the private sector". No new investor was announced in the more than eight months of receivership before the assets were sold.

Why Europe Should Care

The EU's Sustainable and Smart Mobility Strategy aims for a 90% cut in transport emissions by 2050 and for "scheduled collective travel for journeys under 500 km" to be carbon neutral by 2030, according to the European Commission. Small hybrid aircraft flying from underused regional airfields were VoltAero's pitch for that goal: its CORDIS report says 85% of EU air traffic is concentrated in 43 of 2,570 airports (CORDIS). The case shows how long certifying a new aircraft takes compared with the time a small company can finance: the target moved by almost five years, and the company ran out of money before its prototype flew. What survives is the know-how and a flying testbed, now with a better-funded French competitor.

The Verdict

VoltAero, its liquidator and the EIC have not been asked for comment for this article. It is based entirely on public records, company statements and EU project data, linked throughout.