A Giant Energy Storage Facility to Be Built in Lower Silesia

Warsaw‑based Green Capital and the Electrum Group from Białystok have finalized a contract for the construction of one of the largest battery energy storage installations in Poland. The project, with a capacity of 80 MW and 320 MWh, is not only a business success for both companies, but above all a sign that the Polish energy storage market is entering a new, mature phase.

Project details

The EPC contract (engineering, procurement, and construction) предусматривает that initial works in Lwówek Śląski will begin in the second quarter of 2026, with commissioning planned for the third quarter of 2027. Electrum is responsible for the technological scope, equipping the installation with proprietary digital systems (PPC Renedium and EMACS) to optimize market operations.

The cooperation has a long‑term character – the agreement encompasses not only construction and high‑voltage grid integration, but also a five‑year operational contract and long‑term maintenance services.

“When selecting a partner, it was crucial for us to choose an entity that assumes long‑term responsibility for the reliability of the installation, not just its construction,” stresses Michał Polanowski, CEO of Green Capital.

What does this project say about the Polish market?

Until now, most smaller energy storage facilities in Poland were designed primarily for simple arbitrage strategies (buy low, sell high). With a capacity of 320 MWh and a power‑to‑energy ratio of 1:4, Green Capital is developing an asset tailored to the capacity market.

In the current business model, it is precisely long‑term capacity contracts that form the financial backbone of such large‑scale installations. This project clearly demonstrates that the market no longer relies solely on price‑spread revenues.

A key element of the agreement is the five‑year operational and service contract. Today, investors are increasingly unwilling to bear technological risk themselves, shifting responsibility for battery performance and degradation to the contractor. Banks financing such investments now require solid operational guarantees from the entity that built the facility.

It is also worth emphasizing that the location in Lwówek Śląski is no coincidence. Lower Silesia is a region with a significant deficit of available grid connection capacity. The fact that Green Capital has secured 80 MW of connection capacity makes this project one of the most valuable energy assets in this part of Poland.