With the latest round of funding, Helion has raised over $1 billion in capital since it was founded in 2013. The company claims that it will build the world's first nuclear fusion power plant by 2028 and has already secured a purchase agreement from Microsoft which is a major investor in Mr Altman's OpenAI.

Helion’s nuclear fusion promises have garnered the attention of Silicon Valley—and raised concerns amongst scientists wary of its aggressive timeline.

Nuclear fusion startup Helion to build ‘world’s first’ power plant after raising $425 million - Helion Energy says it will ‘keep pushing to do what no one has done before’