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Redwood Materials has secured $425 million in a Series E funding round, with Google as a key investor, to enhance its energy storage solutions for AI data centers. Founded by former Tesla CTO JB Straubel, the company has now raised a total of $4.9 billion, aiming to deploy 20 gigawatt-hours of grid-scale storage by 2028 while repurposing EV batteries into micro-grids.