A Dutch startup, Ore Energy, has developed iron-air batteries that can store and release electricity using a simple chemical process of rusting and de-rusting, offering a cheaper and critical mineral-free alternative to traditional lithium batteries. As Europe aims to reduce its reliance on critical mineral supply chains and increase battery production for renewable energy storage and electric vehicles, the need for long-duration storage batteries is becoming increasingly important. Companies like Ore Energy, Form Energy, Noon Energy, and E-Zinc are working on innovative long-duration energy storage technologies, with a mix of different technologies seen as necessary to support grid reliability as renewable energy sources grow. Europe must find sustainable solutions for long-duration storage to avoid overbuilding, curtailment, and backup generation challenges in transitioning to cleaner energy sources and achieving climate goals.