+++ Green Capital S.A. and Prime Capital AG to build 300 MW Battery Storage Portfolio in Poland +++

May 19, 2026

2 Battery Energy Storage Systems (BESS) projects totaling 300 MW – joint venture established, with construction of the first project scheduled to commence in Q2 2026
Both projects secured 17-year capacity market contracts, ensuring strong commercial viability
Partnership accelerates Green Capital´s transition towards IPP and strengthens grid stability for Poland´s energy transition

Green Capital S.A. (“Green Capital”), a prominent renewable energy developer, and Prime Capital AG (“Prime Capital”), a leading independent asset manager, announced today the signing of strategic agreements to jointly realize a 300 MW portfolio of Battery Energy Storage Systems (BESS) in Poland.

Under the terms of the transaction, Prime Capital has acquired a 50% stake in one advanced-stage project within the portfolio, with construction scheduled to commence in Q2 2026. Simultaneously, the partners have entered into an agreement regarding the joint realization of the second large-scale project which is on the track to achieve Ready-to-Build (RTB) status by the end of 2026, securing a clear path for the development of both assets.

Both projects have successfully secured 17-year capacity market contracts providing fixed availability payments for their BESS capacity and underpinning the commercial viability of the portfolio.

For Green Capital, the partnership with Prime Capital constitutes a pivotal step in its transition from a developer to an Independent Power Producer (IPP) and flexibility service provider. The BESS projects are critical to stabilizing the Polish grid and facilitating the integration of further renewable generation.

With these transactions in Poland, Prime Capital significantly expands its battery energy storage footprint and deepens its presence in the rapidly growing European storage market – enhancing power system resilience.

Michał Polanowski, CEO, Green Capital: “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.”

Dr. Mathias Bimberg, head of Energy Infrastructure at Prime capital adds: “This strategic partnership with Green Capital perfectly aligns with our infrastructure investment focus. By acquiring a stake in one project and committing to the joint development of the broader portfolio, we are securing a strong foothold in the rapidly growing Polish storage market. We look forward to working together to bring this 300 MW portfolio to operation, backed by long-term capacity market contracts.”

About Green Capital:

Green Capital S.A. is a Polish integrated renewable energy developer and independent power producer, founded in 2015 by Michał Polanowski. Over the past decade, the company has secured grid connection conditions (WO) for over 2 GW of RES and BESS projects in Poland, advanced over 400 MW to ready-to-build status, and sold more than 250 MW of projects to institutional partners. Green Capital manages the full project lifecycle – from land securing and permitting through construction to long-term asset operations across battery storage, solar, and onshore wind technologies. The company´s domestic pipeline exceeds 13 GW, with 26 MW of photovoltaic assets currently in operation, 80 MW of battery energy storage projects under construction, and more than 240 MW with construction commencement dates planned in 2026. Beyond Poland, Green Capital es expanding across CEE, Africa, and South America, with growing presence at the intersection of renewable energy and digital infrastructure.

Green Capital S.A.

About Prime Capital:

Founded in 2006, Prime Capital AG is an independent asset management firm and financial services provider, owned by management as well as current and former senior employees. The company takes a holistic, cross-divisional approach and specializes in Alternative Investments, in particular in Absolute Return, Energy Infrastructure, and Private Debt. Furthermore, the company provides Access Solutions for the access to Alternative Investments through securitizations and fund structures. Prime Capital currently employs about 120 people in Frankfurt and Luxembourg and is regulated by BaFin and CSSF.

As of December 2025, Prime Capital has approximately EUR 4.1bn Assets under Management as well as EUR 9.0bn Assets under Administration.

For additional information, quotes or requests please contact:

Prime Capital AG

Andreas Kalusche, CEO

Andreas.Kalusche@primecapital-ag.com

Green Capital S.A.

Michał Polanowski, CEO

m.polanowski@greencapitalsa.com

Questions regarding the content please contact Dr. Mathias Bimberg

Tel: +49 69 9686 984 308

Mathias.Bimberg@primecapital-ag.com

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