Finland-based energy startup Granarium Technologies has secured more than €1 million in pre-seed funding to commercialize a breakthrough renewable supercapacitor technology designed to support grid stability and industrial power reliability.
The funding round was led by BSV Ventures, with participation from Beamline, FiBAN, EstBAN, and LatBAN. The company, a spin-off from VTT Technical Research Centre of Finland, has also received the transfer of the underlying technology and intellectual property from VTT.
Granarium’s patented technology uses nanocellulose and biocarbon derived from waste wood and agricultural residues to produce renewable supercapacitors that can store and release electricity rapidly. The company says the technology offers a safer, more sustainable alternative to conventional energy storage systems while reducing production costs by up to 80%.
The supercapacitors are designed to complement battery systems by providing fast-response power for applications such as grid balancing, frequency regulation, peak-load management, and industrial power quality improvement. Demand for such technologies is growing as renewable energy deployment and electrification place increasing pressure on electricity networks.
Granarium plans to launch its first pilot projects within six months, targeting industrial facilities and continuous production operations. Initial commercial production will be carried out on a small industrial scale, with annual capacity of up to 50 units before further expansion through industrial partnerships.
According to the company, the technology supports Europe’s efforts to reduce dependence on critical raw materials by enabling locally sourced and renewable energy storage solutions. The startup also sees future applications in electric vehicles, where the technology could help extend battery life and improve system performance.
Originating from VTT’s advanced bio-based materials research, Granarium’s technology has already achieved Technology Readiness Level 5 (TRL 5) and is backed by a portfolio of granted patents.
