Granarium secures over €1 million to bring renewable supercapacitor technology to market for grid stabilisation

The funding round was led by BSV Ventures and Beamline, with additional participation from the Finnish Business Angels Network (FiBAN), Estonian Business Angels Network (EstBAN), and Latvian Business Angels Network (LatBAN).

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As part of the spinout process, VTT transferred the underlying technology and intellectual property to the newly established company, enabling Granarium to commercialize its innovation independently.

The investment comes amid growing challenges in Europe's energy sector. Grid volatility is rising, while EU regulations, including stricter grid codes and resilience requirements, are becoming more demanding. At the same time, the rapid expansion of renewable energy and electrification is driving long-term demand for fast-response energy storage solutions. UBS forecasts that global energy storage demand will grow by approximately 40% year-over-year in 2026.

Granarium's technology is based on a nanocellulose-powered material platform that binds biocarbon structures for energy storage applications. The company says its approach can reduce production capital expenditure by up to 80%, while delivering safe, scalable, and locally manufacturable energy storage systems.

“A key structural shift is that storage is no longer just ‘backup power’ – it is becoming core grid infrastructure. Granarium is the perfect addition to our portfolio because the company is solving a massive global challenge in a safe and scalable way. We were also impressed with the company’s technology and experience, as well as the capacity to use local raw materials to make the production process sustainable and inexpensive,” says Jana Budkovskaja, Partner at BSV Ventures.

Granarium has already secured pilot customers and established partnerships across its value chain, with plans to launch its first pilot projects within six months of receiving the funding. The initial deployments will target process industries and continuously operating production facilities, where reliable energy storage is critical. The company expects to begin commercial production at a small industrial scale, with the capacity to deliver up to 50 units annually. This initial manufacturing capability is intended to serve as a foundation for rapid scaling through strategic industrial partnerships and expansion into international markets.

“Our approach supports Europe’s strategic goals of reducing dependency on critical raw materials and building local, resilient energy infrastructure. The new technology offers an easily scalable, self-sufficient solution that removes complex logistics chains and enables simple production using locally sourced materials. Deployment is as simple as installing a battery,” says Granarium CEO Paula Viinamäki.

Granarium has developed a first-of-its-kind technology that transforms waste materials into fully renewable supercapacitors capable of storing electricity. Designed as a fast-response energy storage solution, the system works alongside traditional batteries to address short-duration power demands, including grid balancing, frequency regulation, and industrial power quality management. The technology helps stabilize energy networks by managing peak electricity loads, improving power quality, and supporting the efficient integration of distributed renewable energy generation. By repurposing waste materials, Granarium also offers a more sustainable approach to energy storage while enhancing the resilience and flexibility of modern power systems.

“Granarium demonstrates how successful technology transfer can turn advanced bio-based materials into real industrial solutions for secure and resilient energy storage,” says Atte Virtanen, Vice President, Advanced bio-based materials at VTT.

Granarium plans to use the newly secured funding to accelerate the industrialisation of its patented renewable supercapacitor technology, designed for grid stabilisation and industrial energy applications. The solution addresses growing challenges driven by increasing electrification, the rapid adoption of renewable energy sources, and rising demands for power quality and grid reliability.

About Granarium

Granarium Technologies is a DeepTech startup developing sustainable energy storage solutions. The company creates renewable, mining-free supercapacitors using waste wood and agricultural residues, which are converted into nanocellulose-based materials for electricity storage. Unlike traditional batteries and supercapacitors that rely on critical raw materials such as lithium, Granarium's technology uses 100% renewable carbon-based materials, including nanocellulose and biocarbon. Its supercapacitors can deliver instant power responses within seconds, helping stabilize electricity grids, manage peak energy demand, and support distributed renewable energy generation. The company also claims its modular production process can reduce manufacturing capital costs by up to 80% compared with conventional supercapacitor and lithium-ion battery factories, making the technology more affordable and scalable.