Helion, the US fusion startup backed by Open AI founder Sam Altman, announced that it had raised $465m (€404m) in a new funding round that values the company at $15.5bn.
The cash infusion was announced as Helion is racing 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 a deal to deliver power to Microsoft data centres.
Last year Helion began work on its first fusion power plant in Chelan County in Washington.
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