The combined capacity of electricity storages in Finland now exceeds 1,000 MW
Electricity storages provide essential flexibility for Finland’s electricity system. According to data collected and assessed by Fingrid, approximately 1,050 MW of electricity storage capacity has already been connected to the Finnish power grid, and a great number of new connections is expected to realize in the coming years. Information on the estimated total capacity of electricity storages will be published on Fingrid’s website in the near future. It is important to locate electricity storages in the power grid in a way that avoids regional congestion.
Fingrid has started collecting data on electricity storages of at least 1 MW connected to the Finnish power grid. By early February, 261 storage systems had been reported, with a combined power capacity of approximately 980 MW. In addition, the electricity system includes numerous smaller batteries, whose capacity is estimated at around 70 MW based on information obtained via the reserve markets maintained by Fingrid. In total, electricity storages with a combined power capacity of approximately 1,050 MW have so far been connected to the Finnish power grid.
This capacity means that electricity storages could momentarily discharge as much power as the Loviisa nuclear power plant units (507 MW each) produce in total. If, on the other hand, all electricity storages in Finland were charging simultaneously at full power, the load would correspond to twice the peak electricity consumption of the entire city of Tampere*.
Connections, capacities and locations of electricity storage systems in Finland:
- 56% of electricity storages are connected to the distribution grid and 44% to the transmission grid.
- 85% of electricity storages have a capacity of less than 2 MW, 8% have a capacity of 2–10 MW, and 6% have a capacity of more than 10 MW.
- Of the total storage capacity, 31% comes from storages under 2 MW, 12% from 2–10 MW storages, and 57% from storages over 10 MW.
- Approximately half of the electricity storage systems are located south of the Tampere–Lahti–Lappeenranta line, which is a strongly consumption-oriented area in Finland’s power system.
Information on the estimated total capacity of electricity storage systems will be published in the near future on Fingrid’s website and in its open data service.
The Location of Electricity Storages Is Important for the Electricity System
Electricity storages support electricity system’s flexibility by participating in reserve markets and increasingly also in balancing generation and consumption on the electricity exchange. From the perspective of transmission and connection capacity, electricity storages can be challenging in some locations, as a storage system reserves grid capacity in both charging and discharging directions. This situation is becoming increasingly visible in the power grid as storage capacity grows rapidly and the size of individual storage systems is significant. Single large electricity storage can already correspond in power capacity to a medium-sized Finnish town.
As the electricity storage business is inherently location-independent, it is important that storages do not congest the grids and slow down the connection of electricity consumption projects that are dependent on specific locations. Fingrid therefore continuously seeks the most suitable connection points for electricity storages and promotes the implementation of connections at those locations.
Further information:
Petri Parviainen, Head of Unit, Main Grid Services, Fingrid Oyj,
tel. +358 30 395 5282
Laura Ihamäki, Customer Manager, Main Grid Services, Fingrid Oyj,
tel. +358 30 395 5166
Email addresses are in the format: firstname.lastname@fingrid.fi
* According to reporting by Tampereen Energia Sähköverkot, electricity consumption in Tampere reached a new peak of 505 MW on 8 January 2026 at 5:00 pm.