Finnish-developed technology is transforming electricity storage from a passive reserve into an active stabiliser of national power grids. Merus Power’s latest innovations could help solve two major challenges of renewable energy: unpredictable electricity production and grid instability.
As wind and solar power expand worldwide, electricity networks face a growing problem. Renewable energy production fluctuates with the weather, while traditional power stations that help maintain grid stability are gradually being replaced.
Finnish technology company Merus Power is developing an answer: large-scale battery systems equipped with sophisticated power electronics and intelligent control software that can do considerably more than store electricity.
Batteries that help stabilise the grid
One of the company’s most significant innovations is grid-forming technology, which enables battery systems to actively support electricity network stability.
Unlike conventional battery installations that primarily follow existing grid conditions, grid-forming systems can establish and regulate electrical voltage and frequency. They can also provide functions that help compensate for the declining presence of conventional rotating generators.
In January 2026, Merus Power announced a €13 million contract to supply a 30 MW / 80 MWh battery storage system to Neve Oy in Rovaniemi, northern Finland.
The installation is engineered to withstand temperatures as low as −50°C, heavy snowfall and ice. Scheduled for delivery towards the end of 2026, it combines Arctic engineering with Finnish-developed control software and cybersecurity features.
Making existing wind farms more profitable
Another important development was announced in June 2026, when Merus Power secured an agreement worth over €8 million with Exilion for a 20 MW / 41 MWh battery system at the Varevaara wind farm in Tervola.
Its distinguishing feature is a proprietary hybrid controller that allows wind turbines and batteries to operate as one coordinated power system.
The technology can store electricity when production exceeds immediate demand and release it when market conditions are more favourable. It can also improve the utilisation of existing grid connections.
For operators of ageing wind farms, this offers an opportunity to improve profitability without necessarily constructing additional transmission infrastructure.
Finnish intelligence combined with global battery manufacturing
Merus Power is also expanding internationally.
In June 2026, the company signed a strategic cooperation agreement with Chinese battery manufacturer CATL covering approximately 3 GWh of potential battery storage deliveries to Northern Europe.
The technological division is important: CATL supplies battery technology, while Merus Power contributes Finnish-developed power electronics, grid inverters, control software and protection systems.
This combination could allow Finnish engineering to play a growing role in Europe’s electricity infrastructure.
Beyond battery storage, Merus Power is supplying power-quality equipment for battery-powered train charging infrastructure in Denmark and industrial applications in Argentina.
A growing international opportunity
The broader significance of Merus Power’s innovations extends beyond battery capacity.
As renewable electricity becomes increasingly important, power grids need technologies that respond rapidly to disturbances, maintain stable electricity supplies and use existing infrastructure more efficiently.
Merus Power is positioning Finnish power electronics and software expertise at the centre of this transition.
The innovation is not simply storing more electricity. It is making stored electricity intelligent enough to help run the grid.
Photo and Source: Merus Power.
