Microsoft-backed startup now valued at $5.4B Fusion energy startup Helion has yet to prove it can generate electricity, but that hasn't stopped investors from dumping another $425 million into the venture.

A nuclear fusion startup backed by OpenAI founder Sam Altman has raised nearly half a billion dollars to build what it hopes to be the world’s first power plant using the next-generation energy source. US-based Helion Energy recently unveiled its latest prototype in Everett, Washington, before announcing a $425 million funding round this week.

Open AI CEO Sam Altman-backed Startup is investing in world's first nuclear fusion based power plant to solve the energy crisis in United States.

Building a working nuclear fusion reactor has proven to be a daunting challenge even for multiple wealthy nations, as we've seen with the much-delayed ITER project. However, a private start-up called Helion thinks it can build one and start supplying energy by 2028 by taking a different approach than other reactors.

Helion, a fusion energy company, today announced a $425 million Series F investment round that will be used to scale commercialization efforts for the company’s groundbreaking fusion technology. The oversubscribed and upsized round had participation from new investors,

Helion's unorthodox approach to fusion power and relative secrecy has earned it plenty of fans — and critics. But don’t count its investors among the naysayers.