Fusion power startup Helion valued at $15.5B in $465M funding round
Fusion power startup Helion Energy Inc. has closed a $465 million funding round led by Thrive Capital.
The Series G deal also included contributions from SoftBank Vision Fund 2, Lightspeed and more than a half dozen others. Helion stated in its Thursday funding announcement that it’s now valued at $15.5 billion. That’s nearly three times what the company was worth after its last raise in January 2025.
Helion is developing a fusion reactor, a system that generates electricity by fusing atomic nuclei. Merging two atomic nuclei produces a single nucleus that is slightly lighter than the combined mass of the particles from which it was formed. The mass differential turns into energy.
Scientists have long sought to harness fusion for commercial energy generation, but technical challenges still remain. Helion believes that its fusion reactor design, which it calls Polaris, will provide the necessary breakthrough.
