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Helion, a nuclear startup, has raised $15.5 billion in its latest funding round

Helion, a nuclear fusion energy firm, announced on Thursday that it had raised $465'million in its most recent funding round. The investment was led by Thrive Capital.

The round nearly triples Helion’s valuation from its last Series F round of funding in January 2025 when it raised $425m at a valuation $5.4bn.

The financing highlights the increasing demand for electricity in massive data centers that are dedicated to artificial-intelligence operations.

Helion now has a total funding of $1.5 billion. The company stated that proceeds from this latest round would be used to?accelerate commercial deployment, increase manufacturing capacity and support the delivery of clean electricity to customers.

Helion is a company backed by OpenAI founders Sam Altman & Greg Brockman. They are among the many?public and private firms working on fusion's main challenge: generating more energy from a?reaction that is needed to initiate and contain it.

Alta Park Capital and Ford Motor CEO Bill Ford were among the investors in the latest Series G round of funding.

Lightspeed Venture Partners and Mithril Capital, SoftBank Vision Fund 2 as well as Good Ventures Foundation, all existing backers, also participated in the funding.

The funding was announced after Helion's Polaris test machine reportedly used fusion fuel, and reached temperatures of?above?150 million degrees Celsius.

The company has signed agreements in 2023 with Microsoft for the supply of electricity by 2028 and Nucor to build a 500MW Fusion Power Plant.

OpenAI's Sam Altman left Helion's Board earlier this year as the two companies began to explore collaborating "at significant scale".

Helion was founded in 2013 by David Kirtley, John Slough Chris Pihl and George Votroubek. Orion, its first power plant is currently under construction in Malaga (Washington). (Reporting and editing by Ditta Pujara in Bengaluru, Pranav Mathur from Bengaluru)

(source: Reuters)