en.Wedoany.com Reported - Czech industrial group Second Foundation, together with partners, is developing three two-hour battery energy storage projects with a total capacity of 307 MW, targeting commissioning by the end of 2026. The projects are located in Vraňany, Stonava, and Tušimice, aiming to enhance the flexibility of the Czech transmission grid.
In Vraňany (Mělník District), a 20 MW/40 MWh energy storage system is under construction, sharing a grid connection with the adjacent 33 MW Vepřek solar power plant. In Stonava (Moravian-Silesian Region), an 87 MW/180 MWh storage facility will be built, expected to become the country's temporarily most powerful independent battery energy storage system upon commissioning in late summer 2026. The flagship project in Tušimice has a capacity of 200 MW/400 MWh, directly connected to grid operator ČEPS's 400 kV transmission network via the Czech Republic's first privately operated substation. The project is planned for expansion to 210 MW/420 MWh.
Vojtěch Kačena, founder of Second Foundation, stated that battery storage can help efficiently integrate renewable energy into the grid against a backdrop of increasing electricity price volatility, meaning more stable prices for consumers in the long term and an opportunity for Europe to continue reducing the share of fossil fuels in its energy mix.
All three projects rely on the European technology chain. The battery systems are supplied by Czech manufacturer GAZ Energy, whose production facility is located in Bohumín, with roots tracing back to Geräte- und Akkumulatorenwerk in Zwickau, Germany. GAZ Energy is currently producing systems for European projects with a total capacity of 1,500 MWh. The energy and battery management systems (EMS/BMS) are developed in-house by Second Foundation, ensuring full data control and cybersecurity within European infrastructure. David Vodička, a board member of GAZ Energy, stated that the company places high importance on safety compliant with all European standards and optimizes integration with leading trading platforms, enabling asset owners to maximize return on investment.
Optimization of these projects is handled by Nano Energies, a subsidiary recently acquired by Second Foundation, which has 16 years of market experience. Second Foundation currently manages over 110 MW of battery storage across multiple European markets and Japan through automated trading (over 100,000 transactions daily). Battery storage assets in its portfolio generated an average annual revenue of €340,000 per MW in 2025. Chief Investment Officer Tomáš Wiedermann stated that all three projects are on schedule, targeting commissioning by the end of 2026, and the total 307 MW of new capacity will significantly strengthen the Czech transmission system.
Jan Fousek, Managing Director of industry association AKU-BAT CZ, stated that the Czech battery storage market is finally moving from project proposals to actual construction, and professional trading of large-scale storage assets is what distinguishes successful projects from others, with banks also requiring experienced flexibility aggregators to finance projects.
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