TL;DR

  • Green Capital S.A. and Prime Capital AG are partnering to develop a 300 MW battery storage portfolio in Poland.
  • The project will span multiple sites in Poland and is designed to support grid stability, renewable integration, and energy flexibility within the European market.
  • The collaboration combines local development expertise and infrastructure investment experience to accelerate delivery and long-term growth.

Green Capital S.A. and Prime Capital AG are partnering to develop a 300 MW portfolio of Battery Energy Storage Systems (BESS) in Poland, marking a notable addition to the country’s growing energy storage market. The portfolio is designed to support grid stability, renewable integration, and the broader shift toward a more flexible power system.

Project Scope

The buildout is expected to span multiple sites across Poland, with one advanced-stage project to begin construction in Q2 2026. The partners will also jointly advance a second large-scale project, expected to reach Ready-to-Build status by the end of 2026, establishing a clear development path for both partners.

The collaboration combines Green Capital’s local development expertise with Prime Capital’s infrastructure investment experience. This partnership aims to move Green Capital from a developer to an Independent Power Producer, and help Prime Capital expand its battery energy storage footprint and further cement its presence in the ever-evolving European storage market.

Market Momentum

Large-scale storage is gaining traction across Europe as utilities, developers, and investors look for ways to strengthen grid resilience and support the energy transition. Poland is emerging as an increasingly important market in that shift, with projects like this helping lay the foundation for future growth.

Michał Polanowski, CEO, Green Capital, expressed, “We are delighted to welcome Prime Capital as our partner. By establishing a joint venture for the realization of a 300 MW / 1,200 MWh BESS portfolio, we are marking a transformative moment for Green Capital. Prime Capital brings proven expertise in hybrid infrastructure investment across Europe, including a strong BESS track record, and together we are the first to bring this combination of scale and institutional capital to the Polish storage market. This portfolio will play a crucial role in balancing the national grid, enabling a faster and safer energy transition.”

Company Background

Green Capital S.A. focuses on renewable infrastructure and utility-scale project development. Prime Capital AG brings experience across energy and infrastructure investment. Together, they are advancing a portfolio that is set to play a meaningful role in expanding Poland’s battery storage capacity and modernizing its energy landscape.