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Elestor's hydrogen-iron flow battery architecture may provide a durable solution for grid energy storage, with operational lifetimes projected at 20 to 25 years. Testing showed energy efficiency levels above 80% and round-trip efficiency over 75% across tens of thousands of charge-discharge cycles.

The technology relies on hydrogen and iron salts, avoiding supply chain risks associated with materials like lithium. The projected capital expenditure is approximately €15 per kWh, with levelized costs around €0.02 per kWh. This long-lasting and economical solution is crucial as renewable energy integration increases.