Batteries on the move in Europe: Investors acquire 1.5 GWh from projects in Poland, Romania, UK

Battery energy storage system (BESS) deal-making is happening in a sudden flurry, with over 1.5 GWh of capacity changing hands in a week of activity across Poland, the UK, and Romania.

Canadian-listed power producer Northland Power scored the biggest deal with a significant growth in footprint in Poland, where it acquired 300 MW of power output but 1.2 GWh of capacity. The deal, valued at approximately €200 million, involves two massive projects, Mieczysławów (200 MW / 800 MWh) and Kamionka (100 MW / 400 MWh), each with four-hour duration batteries.

These longer-duration assets are anchored by 17-year capacity auction contracts indexed to inflation, providing a stable revenue floor alongside arbitrage opportunities. There is additional revenue via energy arbitrage and participation in ancillary service markets, according to the press release.

Christine Healy, CEO of Northland, said that the move is an “important milestone” for the region in terms of activity, while adding, “Battery storage is essential to enabling a reliable, lower-carbon energy system, and these projects represent a strong strategic fit with our growth ambitions,” he stated.

Greenvolt Power sold the Polish projects. João Manso Neto, CEO of the Greenvolt Group said, “This agreement demonstrates Greenvolt’s ability to develop and bring large-scale projects to market, particularly in battery storage. We have developed a strategically located portfolio that is attracting strong market interest, enabling us to execute our asset rotation strategy, reallocate capital and accelerate the deployment of clean energy projects.”

UK, Romania

In the UK, Gresham House Energy Storage Fund (GRID) has signed a conditional agreement for “Elland 2” in West Yorkshire. This 100 MW / 200 MWh asset is set to become the largest in GRID’s operational portfolio. That said, the deal is conditional on specific regulatory outcomes, and the project must secure an acceptable “Gate 2” connection offer through the National Energy System Operator’s ongoing Queue Reform process, expected by March 2026.

Ben Guest, Fund Manager at Gresham House, described the acquisition as a “major step” in their three-year strategy, noting that they “aim to begin construction of Elland 2 within the next few months and will be procuring long lead items in the meantime.”

The GRID fund hit 1 GW of operational BESS in the UK earlier this year.

Meanwhile, Romania’s nascent market is seeing investment as well, with Windin’ Capital Fund acquiring a 50% stake in a hybrid setup featuring a 67 MW solar park coupled with a 180 MWh storage component. Legal advisor Horia Ispas of Nyerges & Partners, which announced the deal without further information, emphasized that “hybrid renewable projects require investors who understand market trends shaping tomorrow’s energy systems.”

The project is located in the city of Sebes, Alba County, in the region of Transylvania.