US-based Helion Energy has received the clearances to start building its fusion reactor for the world's first fusion power plant.

Helion Clears Key Regulatory Milestone on the Path to Building and Operating the World's First Fusion Power PlantWith Washington State DOH licenses in place, Helion moves closer…

Helion is the first company licensed to operate a fusion power plant. But the Sam Altman-backed firm still has to prove fusion can deliver commercial power.