Nuclear fusion energy company Helion has completed a new round of financing at a valuation of approximately $15.5 billion, led by investment firm Thrive.

Helion, a nuclear fusion energy startup backed by OpenAI co-founder Sam Altman, has completed a new round of financing, bringing its latest valuation to approximately $15.5 billion, nearly tripling its previous valuation. This round was led by investment firm Thrive, with participation from other technology and financial investors. Helion is advancing its commercial nuclear fusion power generation project and plans to use the new funds to expand its power generation and experimental facilities, accelerate the verification of key technologies, and pursue long-term power supply agreements with electricity purchasers to support the deployment of its first commercial nuclear fusion power plants.