Helion Energy

Fusion Energy · Clean Energy · Deep Tech

Funding

Helion raises $425M Series F, pushing fusion power plant toward 2028

A $15.5 billion valuation shows investors betting fusion can go from laboratory milestone to grid power faster than skeptics think.

• Helion Energy closed a $425 million Series F, lifting total funding since its 2013 founding to roughly $1.5 billion at a $15.5 billion valuation, with Lightspeed Venture Partners and SoftBank's Vision Fund 2 among the backers.
• The Everett, Washington-based startup is building Orion, a 50-megawatt fusion plant designed to supply electricity to Microsoft starting in 2028.
• Helion's reactors pulse plasma in a field-reversed configuration and aim to recover electricity directly from the expanding plasma, skipping the steam turbines used in conventional and fission plants.
• Helion's seventh prototype, Polaris, has reached plasma temperatures exceeding 100 million degrees Celsius as the company works toward generating net electricity for the first time.
• Helion recently became the first fusion company to obtain a Radioactive Materials License and Radioactive Air Emissions License from Washington state regulators, a hurdle no fusion developer had cleared before.
• Rival Commonwealth Fusion Systems raised $1 billion in July, bringing its total funding to $4 billion, underscoring a broader capital race to be first to deliver fusion power to the grid.
• Private capital is now treating commercial fusion as a near-term infrastructure bet rather than a distant science project, even though no company has yet achieved net-energy ignition.