Finnish startup transforms recycled wood and agricultural waste into a renewable supercapacitor, promises up to 80% lower cost and targets more stable power grids without relying heavily on lithium, nickel, and cobalt.

Written by Fabio Lucas Carvalho

Published on 10/06/2026 at 23:49

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Technology developed by Granarium Technologies uses nanocellulose, biochar from wood waste and agricultural by-products to create renewable supercapacitors, promising ultra-fast storage, less dependence on critical minerals, and initial application in electrical grids and industrial environments.

Supercapacitor from recycled wood and agricultural waste is Granarium Technologies’ bet to store electricity in ultra-fast response, stabilize electrical grids, and reduce dependence on critical minerals.

Waste becomes energy infrastructure

The startup’s proposal arises at a sensitive point in the energy transition. Grids with more solar and wind energy need to react quickly to variations in production and consumption.

The technology was developed from research at the Finnish technological center VTT. Now, Granarium is working to bring the solution from the laboratory to real industrial applications.

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How the supercapacitor acts in the electrical grid

Supercapacitors do not have the same function as batteries. While batteries store large amounts of energy for hours, these devices absorb and release electricity in seconds or milliseconds.

This rapid response helps to compensate for sudden fluctuations in the electrical grid. It also contributes to maintaining the system’s frequency stable and protecting sensitive equipment against micro-interruptions or voltage drops.

The technology can be useful in managing industrial consumption peaks. In grids with renewable sources, this reaction capability gains operational importance.

Granarium presents the renewable supercapacitor as a complement to batteries, not as a substitute. The main function is to offer speed, stability, and flexibility where instant response is essential.

Less dependence on critical minerals

A large part of current energy storage depends on minerals such as lithium, nickel, cobalt, and graphite. These inputs accompany the demand for electric mobility and renewable energies.

The Finnish alternative takes a different path by using biocarbon and nanocellulose structures. The goal is to store energy efficiently without resorting to scarce raw materials.

Since these materials can be obtained locally in several European countries, the solution reduces exposure to long international supply chains. This aligns with Europe’s pursuit of strategic autonomy in energy technologies.

Recycled wood and agricultural waste gain value

The proposal also takes advantage of materials that would have limited value. Forest debris, sawdust, agricultural waste, and wood by-products can cease to be low-value biomass.

By transforming them into energy components, the technology creates a more valuable application. This utilization can generate new income in rural and forest areas.

The logic shifts part of energy storage from mining to renewable biological resources. It is a significant change for production chains that already deal with wood, plant waste, and biomaterials.

Industrial applications and the future of technology

The first pilot projects planned by the company target continuous industrial facilities. Sectors such as metallurgy, paper, chemicals, and materials require stable and high-quality electricity.

In these environments, renewable supercapacitors can function as a protective layer between the grid and industrial processes. The instant response helps reduce interruptions and improve operational efficiency.

In the future, researchers see possibilities beyond the electrical grid. One area involves components that combine structural function and energy storage, especially in applications related to electric mobility.

Even so, progress depends on successful industrial scaling. If the technology advances, it could support grids with high solar and wind energy penetration, local energy communities, and factories that require stable supply.

The topic also opens space for public debate on innovation, waste, and energy infrastructure. Do you believe that solutions made with recycled wood and agricultural by-products can scale in electrical grids? Share your vision and discuss which applications seem most promising.

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Finnish startup transforms recycled wood and agricultural waste into a renewable supercapacitor, promises up to 80% lower cost and targets more stable power grids without relying heavily on lithium, nickel, and cobalt.

Technology developed by Granarium Technologies uses nanocellulose, biochar from wood waste and agricultural by-products to create renewable supercapacitors, promising ultra-fast storage, less dependence on critical minerals, and initial application in electrical grids and industrial environments.

Waste becomes energy infrastructure

How the supercapacitor acts in the electrical grid

Less dependence on critical minerals

Recycled wood and agricultural waste gain value

Industrial applications and the future of technology

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Finnish startup transforms recycled wood and agricultural waste into a renewable supercapacitor, promises up to 80% lower cost and targets more stable power grids without relying heavily on lithium, nickel, and cobalt.

Technology developed by Granarium Technologies uses nanocellulose, biochar from wood waste and agricultural by-products to create renewable supercapacitors, promising ultra-fast storage, less dependence on critical minerals, and initial application in electrical grids and industrial environments.

Waste becomes energy infrastructure

How the supercapacitor acts in the electrical grid

Less dependence on critical minerals

Recycled wood and agricultural waste gain value

Industrial applications and the future of technology

Engineers want to carve through Africa with a giant canal to bring water from the world’s second-largest river to a dying lake on the edge of the Sahara Desert that has already lost 90% of its water.

Workers were opening a modern road in Dover when they found, 6 meters below the asphalt, a 3,500-year-old boat made of stitched oak and plant fibers.

A giant brown band visible from space, approximately 8,850 kilometers long, connected Africa to America in the Atlantic Ocean, and satellites revealed that it is neither land nor pollution, but the largest accumulation of seaweed in the world, which broke records in 2025.

In just one cast, fishermen are surprised to capture 14,096 mullets in Bombinhas and close a historic season with 58,000 fish; scene recorded in the Santa Catarina paradise marks the last day of the 2026 season.

Two 17-year-old Kenyans use coconut shells, corn cobs, and recycled materials to create an exhaust filter that reduces 93.3% of pollutant particles and wins an environmental award in Africa.

Consumers eat six times more chicken than in the 1960s, global meat supply quadruples in 60 years, and FAO report reveals the invisible cost on the plate: livestock could drive 80% of the increase in agricultural emissions over the next decade.

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