Fusion Energy Funding
Helion Has Raised $465 Million in a Series G Funding Round
Adam Harrie — June 5, 2026
Helion raised $465 million in Series G funding, led by Thrive Capital, bringing its total funding to $1.5 billion and its post-money valuation to $15.5 billion. The capital will support expanded US manufacturing capacity and accelerate the deployment of commercial fusion power, with Helion targeting electricity delivery to customers later this decade.
The funding follows key milestones for Helion's seventh-generation Polaris prototype, which became the first privately funded fusion machine to operate on deuterium-tritium fuel and achieved plasma temperatures exceeding 150 million degrees Celsius. The company's first fusion power plant, Orion, is currently under construction in Malaga, Washington.
As global electricity demand continues to rise, Helion shows how fusion energy is attracting growing investor confidence as a potential source of clean, always-on power.
