When Sam Altman arrived at Helion Energy’s small Redmond, Wash., office in early 2014, nuclear-fusion textbooks tucked under his arm, the company was focusing its efforts on research and development.

A nuclear fusion startup just hit a hot new milestone. Everett, Washington-based Helion Energy announced that its nuclear fusion prototype reactor achieved plasma temperatures of about 270 million ...

Historic grid request: Commonwealth Fusion Systems has applied to connect its planned ARC reactor to PJM Interconnection, marking the first such U.S. filing by a fusion firm. Rapid testbed strategy: ...

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 ...

Artificial intelligence (AI) group OpenAI is reportedly discussing buying electricity from Helion Energy, the fusion startup company based in Everett, Washington. Sources told POWER that a deal would ...

Sustainability: News about the rapidly growing climate tech sector and other areas of innovation to protect our planet. SEE MORE by Lisa Stiffler on Feb 13, 2026 at 2:00 am February 13, 2026 at 11:11 ...

Washington-based fusion energy company Helion just raised US$425 million in fresh funding for its bid to be the first to produce usable electricity through nuclear fusion. The firm's latest Series F ...

Polaris becomes first privately funded fusion energy machine to operate with deuterium-tritium fuel, sets record with plasma temperatures of 150 million degrees Celsius Helion, a Washington-based ...

Fusion research company Helion Energy said its Polaris prototype has set new industry benchmarks, becoming the first privately developed fusion energy machine to demonstrate measurable ...

Booth is a reporter at TIME. Booth is a reporter at TIME. When Sam Altman arrived at Helion Energy’s small Redmond, Wash., office in early 2014, nuclear-fusion textbooks tucked under his arm, the ...

EVERETT, Wash.--(BUSINESS WIRE)--Helion, a Washington-based fusion energy company, announced that its Polaris prototype has set new fusion industry benchmarks, becoming the first privately developed ...