Frankfurt-based infrastructure investor Prime Capital AG has completed the acquisition of an 85 MW / 170 MWh battery energy storage system project in Pyhäsalmi, Finland, purchasing the project company from Swedish developer Sustainable Energy Solutions Sweden Holding AB and Finland’s Dovre Group Oyj.

The transaction values the deal at approximately €5.5 million for the full equity stake. SENS divested its 55 percent holding, while Dovre Group sold its remaining 45 percent interest. In addition to the upfront consideration, the agreement includes a profit-sharing mechanism extending through July 2027, conditional on the project reaching completion before that date.

 

Transaction Structure and Financial Impact

 

SENS confirmed that proceeds from the sale will be recognised in the first quarter of 2026. The structured earn-out component aligns incentives around timely project delivery, allowing the former shareholders to benefit from value creation if construction milestones are met within the agreed timeframe.

The acquisition grants Prime Capital full ownership of the project company, positioning the investor to oversee final development and commercial deployment.

 

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Strategic Role Within the Pyhäsalmi Energy Cluster

 

The battery storage project forms part of a broader energy cluster under development at the former Pyhäsalmi mine site. The location has been positioned as a hub for renewable and flexible energy infrastructure, leveraging grid connectivity and industrial land availability.

The 170 MWh facility is designed to participate in Finland’s frequency regulation markets and electricity arbitrage. As Nordic power systems integrate higher shares of wind generation, grid balancing services and short-term flexibility have become increasingly valuable components of energy market operations.

Frequency regulation services support grid stability by responding rapidly to fluctuations in supply and demand, while arbitrage enables storage operators to charge during periods of lower electricity prices and discharge when prices rise.

 

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Portfolio Development Strategy

 

SENS described the transaction as validation of its strategy to originate and mature larger scale battery storage projects in high-value grid locations before monetisation. By exiting at this stage, the developer intends to recycle capital into additional projects within its pipeline.

For Prime Capital, the acquisition expands exposure to Nordic energy storage infrastructure, a segment expected to grow as Finland continues to scale wind capacity and deepen electricity market integration with neighbouring countries.

The deal reflects ongoing investor appetite for grid-scale battery assets that can generate revenue across multiple market streams while supporting system flexibility in increasingly renewable-heavy power systems.