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The battery is made of iron and air. The raw materials cost almost nothing. That is the whole point.
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I ran Tesla's energy storage division. Lithium-ion is great for 4 hours. The grid needs 100 hours. That gap is why Form Energy exists.
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Reversible rusting. That is the entire technology. Iron rusts to discharge. You reverse the rust to charge. Nature has been doing this for billions of years.
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Bill Gates invested because he understands that the hardest problem in clean energy is multi-day storage. We solve it.
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Our factory is in Weirton West Virginia. We are bringing clean energy manufacturing to a former steel town. The symbolism is intentional.