Quote from Kauppalehti news. This paragraph is significant for many reasons.
Benjamin Kennedy, Managing Director Infrastructure - Renewables at Ardian, states: “The completion of Mertaniemi is a significant milestone for us, as it is Ardian’s Clean Energy Fund’s first investment in electricity storage in Finland. As the country’s wind power capacity continues to grow, the need for storage solutions has further increased, which is why electricity storage is a very important factor in maintaining grid stability and improving reliability. We are proud to have brought the solution into operation in 18 months, and we see significant investment opportunities in electricity storage in the Nordics, where we intend to continue building the platform.”
It is no coincidence that the electricity storage is in Lappeenranta, when looking at a map of where Finland’s wind power plants are located. In addition, the image below shows the locations of Nuclear Power Plants.
Source: https://lehti.seamk.fi/verkkolehti/keskisuuri-tuulivoima-suomessa/
Source: https://fi.wikipedia.org/wiki/Ydinvoima_Suomessa
Eastern Finland is a complete desert in terms of emission-free energy production. Wind power plants are not built on the Eastern border because of Russia. The same applies to Nuclear Power Plants. Furthermore, energy-intensive industry is concentrated in the west and coastal areas. However, Eastern Finland still has settlements that need reliable energy. Transmission connections from West to East are one priority area for Fingrid:
In autumn 2024, Fingrid, together with Eastern Finland’s distribution network companies, compiled a separate development proposal for the Eastern Finland network. The proposal is based on Fingrid’s published transmission network development plan, the distribution network companies’ own development plans, and separate plans made based on potential customer needs. The main message of the proposal is that there is ample space in Eastern Finland’s electricity grid for new production and consumption projects, and that the electricity grid will be developed based on customer needs in cooperation with regional distribution network companies and industry operators.
Furthermore, a large amount of variable renewable energy production requires balancing elements, because the wind doesn’t always blow, nor does the sun always shine. The electricity grid can be very vulnerable to disturbances – whether intentional or caused by natural phenomena – and securing electricity supply during disruptions is more important today than ever. Society descends into chaos very quickly when electricity stops flowing from the socket.
For example, the blackout seen in Spain and Portugal a few weeks ago was apparently caused by natural phenomena, but partly also because the country’s electricity grid was not prepared for such a disturbance, causing a domino effect. Large fluctuations in electricity demand in different places brought down the grid.
A rare and powerful atmospheric phenomenon has been blamed for the massive blackout that plunged large parts of Spain, Portugal and even parts of southern France into darkness on Monday (April 28). The unprecedented outage disrupted daily life for over 50 million people across the Iberian Peninsula, halting subways, grounding flights, severing phone lines and knocking out traffic lights and ATM machines.
According to Portugal’s electricity grid operator REN, the incident was triggered by “anomalous oscillations” in very high-voltage lines, caused by extreme temperature variations in Spain. This rare event, known as an “induced atmospheric variation,” led to synchronisation failures across the interconnected European electricity network, causing successive disturbances and widespread outages.
The growth of variable renewable energy sources in Europe places significant demands not only on the transmission grid, but local solutions can also help in smaller or larger problem situations.
Where Elisa offers Home Battery to households, Merus can offer local storage solutions for unforeseen disruptions and even ensure power supply for a private entity – or why not a public one? – that has prepared with its own electricity storage, at least for some time. Enough decentralized solutions of this kind will increase the resilience of society and businesses and ensure the functioning of society during difficult times.
What might be the prospects for nationally important actors in terms of security of supply to acquire similar solutions? Isn’t domesticity an asset in such uncertain times? 
I see a bright future for Merus’s business. It’s the right company, in the right place, at the right time. It stays in the portfolio. Perhaps I’ll add more. 
ps. This is not investment advice. I also invested in Hyzon. And Plug Power. 
Read at your own risk.