StoryTest
Helion reports measurable D-T fusion and 150-million-degree plasmas in Polaris
Helion announced that Polaris, its experimental fusion machine, became the first privately built device to demonstrate measurable deuterium-tritium fusion and reached plasma temperatures of 150 million degrees Celsius, exceeding the 100 million degree record set by its Trenta prototype.
- Polaris is the first privately developed machine to show measurable D-T fusion reactions.
- Reached 150 million degrees Celsius, up from Trenta's 100 million degree record.
- Testing began in January 2026; Helion received regulatory approval to use tritium for fusion demonstrations.
- Helion plans to transition Polaris to deuterium-helium-3 fuel for commercial power generation.