Commonwealth Fusion Systems, a startup born out of MIT, has raised the most money, nearly $2 billion from the likes of Bill Gates, Jeff Bezos and Google.
Washington-based Helion has raised $1 billion from investors like Open AI's Sam Altman and a highly ambitious deal with Microsoft to deliver fusion power to the grid by 2028. Google-backed TAE Technologies has raised $1.2 billion.
"Whoever has essentially abundant limitless energy … can impact everything you think of," said Michl Binderbauer, CEO of TAE Technologies. "That is a scary thought if that's in the wrong hands."
When it comes to public funding, China is way ahead.