Helion raises $465M Series G led by Thrive Capital at a $15.5B valuation

Helion

Helion raised $465 million in a Series G led by Thrive Capital at a $15.5 billion valuation, taking total funding past $1.5 billion. It is testing its seventh prototype, Polaris, while building the 50 MW Orion plant in Malaga, Washington, with a 2028 deadline to supply Microsoft.

• Series G funding of $465M at $15.5B valuation brings Helion's total raised to over $1.5B, positioning it as the best-funded fusion company.
• Helion is testing Polaris, its seventh prototype, while constructing Orion, a 50 MW plant due to deliver power to Microsoft by 2028.
• The capital supports both prototype development and Orion's deployment, de-risking the path to commercial fusion electricity delivery.