Helion, the fusion startup backed by Sam Altman, announced on Thursday that it raised $465 million in a new funding round valuing the company at $15.5 billion. The cash infusion lands as Helion races to complete Orion, its first power plant. The startup has set an aggressive timeline to deploy fusion power to the grid as early as 2028 if it can deliver on the terms of its deal with Microsoft. Helion last raised $425 million in January 2025. Alto…
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