Helion, a leader in fusion energy technology, has raised $425 million in a Series F investment round aimed at accelerating the commercialization of its fusion power solutions. This oversubscribed funding round included new investors like Lightspeed Venture Partners, SoftBank Vision Fund 2, and a major university endowment, alongside existing backers such as Sam Altman, Mithril Capital, Capricorn Investment Group, Dustin Moskovitz through Good Ventures Foundation, and Nucor. This latest investment brings the total funding raised by Helion to over $1 billion, valuing the company at $5.425 billion post-money.

Progressing Toward Commercial Fusion Energy

David Kirtley, Helion’s co-founder and CEO, expressed confidence in the company’s trajectory, stating, “We are on the brink of delivering a transformative energy solution that can meet the world’s increasing electricity demands while preserving U.S. energy leadership.” Helion’s mission remains focused on rapidly developing and deploying fusion power generators capable of providing abundant, affordable electricity.

Helion’s latest achievement includes the successful operation of its 7th-generation prototype, Polaris, which is set to demonstrate the first electricity produced from fusion. This follows the success of the Trenta prototype, which made headlines as the first private company to achieve a fuel temperature of 100 million degrees Celsius—reaching the necessary temperature for commercial fusion power generation.

Transformational Potential of Fusion Energy

The Series F investment is a significant step in Helion’s ambition to scale up fusion energy technology. “Fusion has the potential to be a truly transformational technology for industry and society, and we see Helion as leading the race to bring that technology to market,” said Ravi Mhatre, Managing Partner of Lightspeed Venture Partners. He emphasized the company’s strong technology and leadership as Helion transitions from research and development to commercial production.

Helion has already secured notable agreements to take its technology to market. In 2023, the company signed a power purchase agreement (PPA) with Microsoft, which aims to source electricity from a 50 MW fusion plant beginning in 2028. Additionally, Helion reached a customer agreement with Nucor to develop a 500 MW fusion power plant in the 2030s. The company intends to locate its first commercial fusion plant in Washington state.