Energy storage

Energy storage

At the forefront of the flexible energy system

With renewable energy production on the rise, it has become increasingly important to plan, develop, and build solutions for storing renewable energy in connection with power generation. Storage is required for periods when renewable energy production is either low or excessively high to balance out electricity availability and price fluctuations in the market.

Alongside developing, planning, constructing and maintaining renewable energy farms, we are also responsible for selling the generated energy to the market. This is why we at Ilmatar invest heavily in flexible use of renewable energy with storage solutions. 

Currently we have over 20 storage projects under development in Finland and in Sweden.

We primarily plan energy storage solutions to locations in close proximity to our existing wind or solar power generation. This strategy allows us to use existing infrastructure, such as roads and electrical stations, ensuring efficient land use. Another advantage of having production and storage in the same location is reduced transmission losses. Storage is a comprehensive tool for capacity management, both in-farm and in relation to the national electricity grid. 

Accelerating the change

We are at the vanguard of the development of the future fossil-free energy ecosystem. Here is what we have done so far:

  • We partnered with Glennmont Partners to build a groundbreaking energy storage facility at the Piiparinmäki wind farm in Finland.
  • In Alajärvi, Finland, we are constructing one of Europe’s first hybrid energy production projects.
  • We collaborate with Polar Night Energy (PNE) focusing on innovative energy storage – the PNE sand battery technology, offering commercial pilot opportunities in our renewable energy production parks as the technology advances.
Ilmatar and PNE shaking hands

Benefits of energy storage

Balancing supply and demand

Energy storage is an effective way to balance supply and demand in the electricity market. When demand is lower, energy can be stored to be released and consumed when demand rises.

Renewable integration

By storing excess energy from renewable sources like solar and wind, energy storage systems facilitate the seamless integration of intermittent renewables into the energy mix.

Grid stability

Energy storage balances renewable energy production, stabilising the grid, reducing blackout risks, and managing voltage fluctuations.

Environmental sustainability

Energy storage systems help reduce carbon emissions by enabling the integration of renewable energy sources into the grid.


Once installed, energy storage systems offer a cost-effective way to store and utilise renewable energy.

Flexibility on the rise

Deployment of energy storage is rapidly increasing due to decreasing costs and advancing technology.