The Short Life of Aeristech's EIC Accelerator Hydrogen Compressor

Aeristech Limited, a Warwickshire developer of ultra-high-speed electric motors, entered administration on 3 February 2025, five years after the European Union began funding its air compressor for hydrogen fuel cells. The company was selected in the 5 June 2019 cut-off of the EIC SME Instrument Phase 2, the forerunner of today's EIC Accelerator, according to the European Commission's list of selected companies, which names Aeristech Ltd as the only company behind the project. Its two-year project, FC-eCompressor, received an EU contribution of €817,530 towards a total cost of €1,167,900, according to CORDIS. Administrators from Begbies Traynor were appointed by the High Court, according to a notice in The Gazette and the Companies House insolvency record, which still listed the company as in administration in October 2026.

Eighteen days after the appointment, the administrators sold the business, equipment, stock and intellectual property for £220,000 to RGW Consulting Ltd, a company whose sole directors and shareholders were two of Aeristech's own directors, according to the administrators' proposals filed in March 2025. The buyer has since paid only part of the price, according to the administrators' progress report of August 2026. RGW Consulting now trades under the Aeristech name from the same unit in Leamington Spa, according to the footer of the Aeristech website and the buyer's Companies House entry.

Where Aeristech Stands Now

The company that won the EU grant is in insolvency, with no staff. All its employees were made redundant on 14 February 2025 because there was no money to pay wages, according to the proposals. Its subsidiary Aeristech Control Technologies Ltd, which held most of the group's patents, went into creditors' voluntary liquidation on the same day as the administration, and is listed as in liquidation at Companies House. The patents were sold to the same buyer for a further £230,000, bringing the whole deal to £450,000.

By 2 August 2026 the buyer had paid £98,500 of the £220,000 owed to Aeristech Limited and £127,000 of the £230,000 owed to the subsidiary, according to the administrators' latest progress report. Both buyer directors had personally guaranteed the deferred payments. The administrators served statutory demands on both, and a bankruptcy order was made against one of them on 5 November 2025; recovery from the other, who lives outside the UK, was still under consideration. Creditors agreed to extend the administration to 2 February 2027, according to the same report and the company's filing history.

The Aeristech brand lives on. The website run by RGW Consulting offers high-speed motors and drives, oil-free compressors, air bearings and engineering consultancy, but its newest news item is dated 8 October 2024, before the insolvency. Whether the new owner has any customers, and how many of the former staff it employs, is not public; its first accounts, to 31 January 2026, are due by 22 October 2026.

The Technology: Small, Fast Motors That Push Air Into Fuel Cells

A fuel cell produces electricity from hydrogen and the oxygen in air. Feeding it air at higher pressure raises its output, so the stack can be smaller and cheaper, but the compressor can consume up to 40% of the power the fuel cell makes, according to the project summary on CORDIS. Aeristech built centrifugal compressors driven by permanent magnet motors spinning at more than 160,000 rpm, with a patented controller that splits the control of torque and speed. It claimed its compressors needed 10 to 20% less power than competing products and were up to 20% smaller. These figures are the company's own; no independent comparison could be found.

The motors grew out of an earlier product, the electric supercharger for petrol and diesel engines. In 2016 Aeristech had 18 staff in Kenilworth and had just opened a test cell for those superchargers, helped by a £26,000 county council grant, according to The Manufacturer. In April 2020 the company won a Queen's Award for Enterprise in Innovation for its "increasingly advanced, high-speed electric motors to power e-superchargers and hydrogen fuel cell air-side compressors", according to Renewable Energy Magazine and GreenFleet.

What the EU Grant Promised, and What It Produced

FC-eCompressor was signed on 3 December 2019 and ran from 1 January 2020 to 31 December 2021. Aeristech said its compressor was a working prototype at technology readiness level 6 and that the project would make sample units with high-volume production methods and "gain approvals for commercial supply", opening markets that would "create at least 110 new jobs and generate over €65 million in cumulative revenue by 2025", according to CORDIS. When the grant was announced in November 2019, the company gave its value as €827,000, according to Race Engine Technology; CORDIS records an EU contribution of €817,530.

The final periodic report lists real engineering progress. Early in the project the company switched both planned products from replaceable bearings to oil-free air bearings, after customers asked for no risk of oil reaching the fuel cell stack. It built nine prototypes and delivered four to customers, passed a 1,000-hour durability test, cut the bill of materials by 30%, installed pilot production equipment including a five-axis grinding machine, ran pre-compliance tests for vehicle electromagnetic standards and gained ISO 9001 certification. Staff grew from 30 to 60 over the project. The report also says the "remaining commercial objectives" were "expected post project", which means approvals for commercial supply were not reached within the grant period.

1. Production-ready compressor designDeliveredAir-bearing eCompressor, 9 prototypes, 30% smaller bill of materials, per the CORDIS report.
2. Samples to customersDelivered4 prototypes delivered; 50 S15 units ordered from Sprintex in December 2022.
3. 4,000 hours of service-free runningPartlyA 1,000-hour durability test passed; no 4,000-hour result published.
4. Approvals for commercial supplyNot shownPre-compliance tests only; commercial objectives deferred past the project.
5. €65M cumulative revenue and 110 jobs by 2025Not achievedTurnover about £1.1M in FY2023; all staff redundant in February 2025.

What Happened After the Grant

In April 2021 Aeristech closed a £5.15 million private funding round led by Sabien Technology, Vela Technologies and SAIC Venture Capital, to expand its engineering teams and add test cells, according to Automotive Powertrain Technology International and Magnetics Magazine. Vela's part was £350,000 at £2.40 a share, invested on 25 February 2021, according to Vela's stock exchange announcement of 6 February 2025, in which it said it expected to write the holding off in full.

The company also joined three UK government-funded fuel cell programmes: H2GEAR, led by GKN Aerospace, and ZeroAvia's HyFlyer II for hydrogen-electric aircraft, plus Trident, a heavy-duty air handling project led by Cummins, according to its own CORDIS report and Magnetics Magazine. In September 2021 it signed a collaboration with the Australian supercharger maker Sprintex to manufacture its e-compressors. In December 2022 Aeristech placed its first production order with Sprintex: 50 units of a 6 kW S15 fuel cell compressor worth US$72,500, according to Stockhead and H2 Bulletin. Follow-on orders for the larger S20 and S39 models were "expected"; none was announced.

Revenue stayed small. The administrators put turnover at about £481,000 in the year to March 2022 and £1.1 million in the year to March 2023, with operating losses of £4.1 million and £4.6 million; draft accounts for the year to March 2024 showed turnover of about £2.6 million and a net loss of £3.3 million. Those draft accounts were never filed: the last accounts at Companies House are for the year to 31 March 2023, and they show net liabilities of £1.38 million and accumulated losses of £19.75 million, against net assets of £1.92 million a year earlier, according to the 2023 accounts and the 2022 accounts.

How the Money Ran Out

The administrators' account of the collapse is blunt. "For the last 24 months the Company has struggled to develop sufficient revenue to maintain solvency," the proposals say, adding that much of its effort had gone into UK government grant projects "that are yet to generate recurring income". Payroll was paid late several times in 2024. HMRC's claim includes £651,123 of unpaid PAYE for periods from October 2023, and in October 2024 HMRC sent bailiffs to value the company's assets. A trade supplier filed a winding-up petition in October 2024 (the proposals give both 4 October and 18 October as the date); other creditors joined it, the debt needed to settle it rose above £300,000, and the advertisement froze the bank account. An accelerated sale process run in December 2024 and January 2025 drew interest but no offers for investment or for the shares.

The main lenders were Birmingham City Council, through a loan facility of about £2.3 million managed by Frontier Development Capital and secured by a charge created on 16 November 2020, and 4Syte Ltd, owed about £261,000 under a charge created on 29 April 2024, as listed on the Companies House charges register. Earlier, in February 2024, a first notice for compulsory strike-off was published because filings were overdue; it was discontinued the next day, according to the filing history.

Because the buyer has not paid in full, the administrators now expect no payout to employees' preferential claims of about £75,000 or to HMRC's secondary preferential claim of £654,849, a change from their March 2025 estimate. Birmingham City Council may receive "a small distribution", and unsecured creditors nothing, according to the August 2026 progress report. Aeristech is not in the EIC Fund portfolio, which was searched across all pages for this article; its 2019 award was grant only, and CORDIS lists no other EU project for the company.

Why Europe Should Care

Air compressors are one of the parts that decide whether fuel cell trucks and aircraft can compete on cost, and the European Commission's hydrogen strategy of July 2020 set out to build a European hydrogen value chain, including fuel cells for heavy transport. Aeristech was a British company funded under Horizon 2020 while the UK was still in the programme, so its patents and know-how were never part of an EU supply chain after Brexit. Its fate shows a familiar gap: a grant and a Queen's Award can carry a component to prototype and pilot production, but a supplier of parts to an infant market needs customers placing volume orders, and the administrators say the company struggled to develop sufficient revenue to maintain solvency.

The Verdict

Aeristech's administrators and RGW Consulting were not asked for comment for this article. It is based on public records and published statements, linked throughout.