Vanevo and the EIC Accelerator: Flow Battery Stacks, One at a Time

Vanevo, based in Oldenburg, makes stacks and modules for redox flow batteries, large liquid-based batteries that store wind and solar power for hours. Its patented process glues the stack together in one step, using one seal where conventional designs use 160, which the company says makes it cheaper and simpler. With the EIC it "intends to automate the stack and module production", according to CORDIS.

The European Innovation Council granted €1,680,875 towards a €2.43 million project from February 2023 to April 2025. The final report says a cost-optimised module for different electrolytes was developed and tested, with a self-learning battery management system, and that "an optimised and automated production process is developed". It gives no production volumes, costs or test results. Vanevo's news page reports a 10 kW / 40 kWh module sold to a Dutch system integrator in September 2024 and a third "Power Tower" shipped to the flow battery maker H2OVOLT. In August 2025 it raised about €1.8 million to expand sales and build a pilot plant.

Where Vanevo Stands Now

NBank Capital put in €400,000 of the 2025 round, and private investors the rest. The company's share capital rose in 2024 and twice in 2025, and a managing director left in January 2026, according to register publications shown by North Data. In December 2025 it received a German grant of €114,765 to integrate its stacks into other companies' systems. H2OVOLT uses its Power Towers, made of stacks, sensors, battery management and pumps, to build complete batteries for smaller companies.

The Technology: One Glued Seal

In a redox flow battery, energy is stored in liquid electrolytes pumped through stacks of cells, which must be sealed against leaks. Vanevo replaces screws and seals with an adhesive that closes the stack in one step. The report says the module works with vanadium and organic electrolytes and that further cost cuts depend on cheaper electrolytes and larger production volumes.

What the EIC Project Promised, and What CORDIS Shows

The project promised an automated production process for stacks and modules. The report says the module and process were developed but gives no evidence of automated production running at any scale, and the 2025 financing is for a pilot plant still to be built. CORDIS still lists the project as signed.

1. Standard moduleDeliveredDeveloped and tested.
2. Self-learning BMSDeliveredPer final report.
3. Automated productionDevelopedPilot plant still planned.
4. Commercial salesFirst unitsModules, Power Towers.

The Money

Vanevo's published accounts are balance sheets, which North Data shows only to paying users, so its revenue is not public. Besides the EIC grant, the registers list €437,600 in regional economic aid in 2024 and €385,000 of EU project money through Centre for Process Innovation Ltd. for a digital twin of battery cell assembly. The EIC Fund has not been named as an investor.

What Cannot Be Checked

Why Europe Should Care

The project argues that flow batteries offer the lowest cost per storage cycle but are held back by high upfront costs. Vanevo's approach targets the cost of making the stacks. The EIC funded the development; the evidence at scale is still to come.

The Verdict

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