WARRENDALE, Pennsylvania — Joe Mastrangelo stood on the mezzanine overlooking the factory floor of Eos Energy Enterprises’ new plant, his eyes welling as he looked out over the rows of yellow-caged robotic cells, conveyors, and steel gantries stretching nearly the length of the building below.
“I come and stand here every morning, and I still can’t believe that this is where we are today,” the Eos CEO said. “I am both so humbled and also proud of what we are building.”
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