Why the Same 125 MW Finnish Battery Configuration Has Sold Twice in Four Months

Helios Nordic Energy has sold a 125 MW Finnish battery with 300 MWh of storage, at ready-to-build, to a buying group that includes Delta Capacity. It did the same thing four months ago. The two projects sit in different parts of Finland and carry different names, but the power rating, the energy capacity, the entry point and the commissioning quarter all match.

Key takeaways

• COVENERGO and Delta Capacity have acquired the 125 MW/300 MWh AKKU One standalone battery project at Lapinlahti in North Savo, Finland, from Helios Nordic Energy AB, a subsidiary of Vinci. Terms were not disclosed.
• COVENERGO is the majority owner and led the transaction, while Delta Capacity holds an ownership interest and acts as EPCM contractor with responsibility for securing offtake, construction and long-term asset management.
• Enerdatics records Delta Capacity acquiring a second, identically specified 125 MW/300 MWh Finnish project, Karppio at Teuva, from the same seller in May 2026, also at ready-to-build and also targeting commissioning in the fourth quarter of 2027.
• AKKU One comprises 60 battery containers arranged in 30 integrated blocks and holds a grid connection approval granted in November 2025 for a 340 metre, 110 kV underground cable to Fingrid's Alapitka substation.
• Enerdatics records 26 Finnish battery transactions since the start of 2024, of which 19 were at ready-to-build stage and only two carry a disclosed value, at $0.06 million per MW for 125 MW in March 2025 and $0.03 million per MW for 30 MW in June 2024.

What is actually being repeated here?

Almost every variable that a buyer would normally negotiate. The seller is the same in both transactions. The power rating is the same, the energy capacity is the same, and both projects were handed over at ready-to-build rather than earlier or later. Both are aimed at commissioning in the final quarter of 2027. Delta Capacity appears in both buying groups, paired with the Strioga Family Foundation on the first and with COVENERGO on the second. What changes between them is the equity partner and the location, and very little else. That is not a coincidence of two similar assets arriving on the market. It reads as a product being built to a fixed specification and sold through a route that has already been tested once.

Why does the contractor hold equity in the asset it is building?

Because it removes the interface where cost overruns usually get argued about. EPCM stands for engineering, procurement and construction management, meaning the contractor manages the build and the supply chain rather than delivering a fixed-price turnkey plant. That arrangement leaves the owner carrying more of the delivery risk than a full turnkey contract would, which is precisely the risk Delta Capacity has taken a share of as a part-owner. It is also doing the two jobs that determine whether a merchant Finnish battery earns anything: securing the offtake and managing the asset once it runs. The structure is becoming more common in European storage. Enerdatics recorded the same logic in Wales this month, where the directors of the civil engineering firm holding the balance of plant contract bought a quarter of the project.

Is 2.4 hours a long battery for Finland?

Slightly, but not remarkably. Duration is energy capacity divided by power rating, so 300 MWh across 125 MW gives 2.4 hours of output at full power. Eleven other Finnish battery transactions since the start of 2024 record an energy capacity in Enerdatics' data, and their median duration is two hours. The range runs from 1.2 hours at the short end to two projects at four hours, both bought by Prime Capital. AKKU One sits above the middle of that spread without reaching the long tail. The distinction matters because short-duration assets are built for frequency regulation and balancing, while longer ones can shift meaningful volumes of energy between price periods. At 2.4 hours the asset can do both, which suits a Finnish system absorbing rising volumes of wind.

Enerdatics' data shows how little of this market is priced. Across the 26 Finnish battery transactions recorded since the start of 2024, only two asset deals carry a disclosed value, both of them Alpiq purchases, at $0.06 million per MW for 125 MW in March 2025 and $0.03 million per MW for 30 MW in June 2024. Enerdatics holds a developer premium sample of only three observations for the country, below the threshold it treats as defensible, so it flags the Finnish premium as an insufficient sample rather than publishing a benchmark. Nineteen of the 26 transactions were at ready-to-build stage. The market therefore trades almost entirely at one point in the project lifecycle, and almost entirely without visible pricing, which is an unusual combination: a standardised product with no published price.

What does the deal signal for Finnish storage?

The deal signals that Finnish battery development has industrialised to the point where the same seller can produce identical assets and move them through the same channel twice in a year. Helios Nordic Energy entered Finland roughly three years ago and had already divested more than 550 MW and 1,100 MWh of Finnish battery projects across six transactions in the six months to May 2026. Vinci, its parent, is a construction group rather than an energy investor, and the pattern is consistent throughout: develop to ready-to-build, sell, repeat. Enerdatics has covered the same handover from the other side, where a developer sold its largest Finnish battery the moment it reached ready-to-build.

The open question is on the buy side, not the sell side. Two buying groups with different equity partners took near-identical assets, and in both cases Delta Capacity supplied the development, construction and asset management capability while the partner supplied capital. That splits the transaction into a skill half and a money half, which is a sensible structure in a market where there is no public price to anchor a bid. It also resembles the entry route taken by buyers moving earlier in the lifecycle, including the case where a buyer bought before ready-to-build and completed the development work itself. Finland now has both shapes running at once, and the deciding factor in each is whether the acquirer brings capability or only cash.

Frequently asked questions

How much did COVENERGO and Delta Capacity pay for AKKU One?Terms were not disclosed. Enerdatics records 26 Finnish battery transactions since the start of 2024 with only two disclosed asset values, at $0.06 million per MW and $0.03 million per MW, and flags the country's developer premium sample as insufficient, so there is no reliable benchmark for a project of this size.

What does EPCM mean?EPCM stands for engineering, procurement and construction management. The contractor manages design, supply chain and construction on the owner's behalf rather than delivering a fixed-price turnkey plant, which leaves more of the delivery risk with the owner and makes contractor alignment more valuable.

When will the AKKU One project start operating?Operations are expected to begin in the fourth quarter of 2027. Sungrow will supply the battery system under a 1 GWh framework agreement signed with Delta Capacity earlier in 2026, NYAB is delivering the balance of plant works, and Rejlers is providing technical support during construction.

Ready to get deal-ready answers in seconds? Try Enerdatics Leap AI and access verified intelligence across M&A, financings, PPAs, projects, and energy market developments through natural language.