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Helion Energy closed a $465 million funding round valuing the company at $15.5 billion. The Series G round was led by Thrive Capital and included SoftBank Vision Fund 2, Lightspeed, and over half a dozen other investors. Helion's Polaris fusion reactor uses deuterium and helium-3 fuel to create plasma, accelerates plasma donuts to 100 million miles per hour, and generates electricity via magnetic field changes. The reactor design aims to produce net energy from fusion reactions in a cylindrical structure.
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