Article source: ESG Today
Ore Energy Raises $43 Million for Multi-Day Storage Solution Made from Iron, Water and Air
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Ore Energy closed a $43 million funding round for an iron-based long-duration energy storage system. The technology uses iron, water, and air to store energy across multiple days – a critical gap in renewable integration where lithium-ion batteries falter.
Long-duration storage (8+ hours) remains the hard problem in decarbonisation. Batteries dominate the market, but their economics collapse beyond 12 hours and their supply chains depend on lithium and cobalt extraction. Iron-based systems sidestep both constraints: iron is abundant, recyclable, and already a commodity trade.
Ore's approach isn't novel in concept – iron oxidation-reduction cycles have been studied for years – but scaling it to commercial viability is. The funding suggests investors believe the company can move from lab to grid deployment faster than previous iron-storage entrants managed.
The real test arrives when these systems operate in real grids, absorbing weeklong cloud cover or seasonal wind lulls. Efficiency matters sharply here: a system that stores energy at 60% round-trip efficiency costs more to operate than a system at 75%, even if capital costs are identical.
Ore hasn't disclosed round-trip efficiency, cycle lifespan, or the price per kilowatt-hour delivered. Without those numbers, the valuation tells you only that venture capital believes the market for non-lithium storage will exist. Whether Ore captures it depends on whether they can hit cost and performance targets their competitors – Form Energy, Energy Warehouse, others – are also chasing.