Developer-operator Green Capital and EPC firm Electrum Holding have signed an agreement to build an 80MW/320MWh BESS in Poland, under a full ‘wrap’ model.
The 4-hour battery energy storage system (BESS) will be in the Lower Silesia region and construction will begin in the current quarter (Q2).
Electrum’s engineering, procurement and construction (EPC) scope is a full ‘wrap: energy storage procurement and installation, high-voltage infrastructure works and grid integration, as well as a five-year operations & maintenance deal and further long-term service agreements.
Green Capital said it is scheduled for commissioning in June 2027, while Electrum said it would be in Q3 that year.
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Green Capital is part of the Sun Capital Polska group and is developing a pipeline of renewables and BESS across various markets, and this appears to be its first major BESS that it has progressed to construction.
“By selecting Electrum as the general contractor, we aimed to partner with a company that assumes long-term responsibility for the reliability of the installation, not just its construction,” said Michał Polanowski, CEO of Green Capital.
Most projects in Europe are now opting for ‘multi-contracting’ where separate contractors provide the BESS and EPC works, but newer entrants are generally advised to opt for the ‘wrap’ model to minimise interface risk and simplify the process. But, wraps cost more. Green Capital said the model ensures cost predictability throughout the project’s entire lifecycle.
Electrum will also provide its proprietary digital systems, including the PPC Renedium platform for managing the unit’s operation on the energy market and the EMACS EMS/SCADA control and monitoring system.
“Increasingly, investors expect not only the construction of an energy storage facility, but also the assumption of long-term responsibility for its reliable and market-efficient operation,” says Tomasz Taff, Member of the Management Board at Electrum.
Poland market
Poland has emerged as a major centre for large-scale BESS activity in the past few years, driven by the state’s capacity market (CM) procurements, which has provided a stable bedrock of revenues around which to build a business case. Though, the most recent in late 2025 saw BESS wins fall drastically after a big de-ratings cut for the technology.
The CM auctions in 2022, 2023, 2024 and 2025 saw 165MW, 1.7GW, 2.5GW and 685MW of obligations awarded to BESS (which start five years after award). But, because of the de-rating factors, in total this actually means around 11GW of BESS with CM contracts that are highly likely to be built (because of big penalties for not doing so). See all of our Poland market coverage here.
We did video interviews with R.Power and Econergy, renewables and BESS IPPs active in Poland, at February’s Energy Storage Summit 2026 in London. The Central and Eastern Europe (CEE) event in the Summit series takes place this year in early October in Warsaw, Poland.
