ION-X and the EIC Accelerator: Ion Thrusters for Small Satellites

ION-X, founded in 2021 by the venture builder Technofounders and Professor Jacques Giérak of the CNRS Centre for Nanosciences and Nanotechnologies (C2N), builds electrospray thrusters that accelerate charged droplets of ionic liquid to steer and move small satellites. Its EIC Accelerator project, HYPERION, "The Most Efficient Space Propulsion Ever Put in Space", received an EU contribution of €2,499,999 towards a total cost of €3,571,428 and ran from July 2024 to June 2026, according to CORDIS. The aim was to move from technology demonstration to on-orbit operation and then market availability.

ION-X's first flight prototype launched on 14 January 2025 on Space Inventor's EDISON satellite, a mission sponsored by the European Space Agency, and was operated for six months, according to the project report on CORDIS. In June 2025 ION-X announced the first in-orbit firing of a European-developed ionic liquid electrospray thruster, the second such demonstration worldwide after Busek's on LISA Pathfinder in 2015, according to ION-X. At the end of June 2025 the design of its HALO-100X product was frozen after review by the French space agency CNES.

Where ION-X Stands Now

In December 2024 ION-X raised €13 million from its existing investors Expansion and Technofounders Participation, the EIC Fund and the Île-de-France Region's reindustrialisation fund, to build a production site near Paris and reach 10 thrusters a month in 2026 and 200 a year by 2028, according to ION-X. In July 2025 it agreed to supply a HALO-100X for Estonia's first commercial Earth observation satellite, built by C3S. In 2026 WIRED listed it among Europe's 100 hottest start-ups. It has not reported how many thrusters it has delivered.

The Technology: Thrust From Charged Droplets

Electrospray thrusters use a strong electric field to extract and accelerate ions from a liquid salt, producing tiny but very efficient thrust. The CORDIS summary says ION-X's patented design lets operators change the balance between thrust and fuel efficiency in flight. The six-month EDISON mission validated communication with the thruster, in-flight software updates, automatic failure detection and high-voltage control.

What the EIC Award Promised, and What the Record Shows

HYPERION promised to take ION-X from demonstration to on-orbit operation and market availability. The in-orbit demonstration succeeded and the product design was frozen. Market availability is less clear: one customer order is public, the product's qualification status is not, and production volumes have not been reported.

1. In-orbit demonstrationDeliveredEDISON, 2025.
2. Product designFrozenJune 2025.
3. QualificationUnverifiedNot announced.
4. Series productionUnverifiedNo output data.

The Money

ION-X raised €3.8 million before its Series A, from Technofounders, Expansion, business angels and Bpifrance. Its net loss was €950,239 in 2024 and €550,115 in 2025, according to the INPI financial ratios dataset. Its revenue is filed as confidential.

What Cannot Be Checked

Why Europe Should Care

Small satellites need compact propulsion to manoeuvre, avoid collisions and leave orbit at the end of their lives, the goals of ESA's Zero Debris approach. ION-X is part of a consortium studying that approach for ESA. It says nearly its entire supply chain, including the propellant, is in France.

The Verdict

ION-X and the EIC have not been asked for comment for this article. It is based entirely on public records and published statements, linked throughout.