Greenvolt Power has brought online Poland’s largest battery energy storage system to date — a 200 MW, 800 MWh facility at Turośń Kościelna that holds a capacity market contract, with energy trader Entrix contracted to optimise its dispatch. The project marks the first utility-scale storage asset to reach commercial operation under Poland’s capacity mechanism, demonstrating that the market design can unlock long-duration batteries in Central and Eastern Europe.
Poland’s capacity market, launched in 2021, was built to secure firm capacity as the country phases out coal and integrates rising shares of wind and solar. Until now, most contracted capacity has come from existing thermal plants or demand-side response. Turośń Kościelna changes that dynamic: its four-hour duration and capacity payment provide a revenue floor that made the investment bankable, while Entrix’s optimisation across wholesale, balancing and ancillary services stacks additional value on top.
The milestone reverberates beyond Poland. Across the CEE region, governments are watching whether capacity markets or targeted auctions can deliver storage at scale without bespoke subsidies. Greenvolt’s success — developed, built and commissioned on schedule — offers a template for developers and lenders eyeing similar projects in Romania, Hungary and the Czech Republic, where grid congestion and renewable curtailment are growing concerns.
For Greenvolt, the asset anchors a broader European storage pipeline that now exceeds 1 GW. For Entrix, it showcases a trader-led optimisation model that extracts maximum value from multi-market participation. As Poland’s grid operator prepares for higher renewable penetration and the EU’s electricity market reform pushes for more flexibility, Turośń Kościelna will serve as a real-time test case for how merchant and capacity revenues interact in a decarbonising power system.
Read the full report at Energy Storage News.