As Europe focuses on decarbonizing its energy systems, the need for grid stability, supply security, and strategic autonomy has become paramount. Dutch-based Elestor is addressing these challenges with its hydrogen-iron flow batteries designed for large-scale energy storage. These batteries enable long-duration storage, bridging gaps in intermittent renewable energy generation. By 2025, battery energy storage systems are projected to surpass pumped hydro capacity. Elestor's technology allows for up to 150 hours of electricity storage, providing a scalable and modular solution. The use of iron and hydrogen ensures safety, affordability, and sustainability while aligning with EU regulations and enhancing grid reliability. By leveraging locally available materials like hydrogen and iron sulphate, Elestor promotes geopolitical independence and energy sovereignty. The technology's safety, regulatory compliance, and operational trust contribute to its wide adoption across Europe, supporting the democratization of the energy system and strengthening grid resilience.