Thea Energy becomes first company to complete all DOE fusion milestones

Thea Energy headquarters in Kearny, New Jersey, where independent experts certified the Helios fusion pilot plant design.

(Image courtesy of Thea Energy)

Thea Energy has completed the U.S. Department of Energy’s Milestone-Based Fusion Development Programme. The DOE certified the preconceptual design of its Helios fusion pilot plant, making Thea the first awardee in the programme’s history to clear every milestone since its launch.

Independent reviewers from national laboratories and universities conducted the assessment at Thea’s headquarters in Kearny, New Jersey. They evaluated a detailed technical report covering the physics and engineering behind Helios. Reviewers confirmed a credible path to grid-connected fusion power.

Helios is a stellarator. It uses arrays of planar superconducting coils rather than the twisted geometries conventional stellarators require. Software controls the magnetic field configuration in real time, adapting to live plasma conditions. Thea demonstrated the world’s first superconducting planar coil array as part of earlier programme milestones.

The design incorporates a stellarator divertor exhaust system built for steady-state operation. A sector-based maintenance approach supports long-term plant availability. Both features address the operational demands of a commercial power plant rather than a physics experiment.

Helios feeds directly into a modular, repeatable commercial model. Investors including Lowercarbon Capital back the plant’s programmability and cost structure as suited to scalable deployment. A preprint paper detailing the Helios architecture and its technical foundations has been published alongside the announcement.

DOE’s Jean Paul Allain noted Thea’s pace of progress on a modernised stellarator design. Princeton Plasma Physics Lab’s Felix Parra-Diaz highlighted the technical depth of the work. Thea’s next steps and programme timelines are expected to follow.

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