Article

Thea Energy, Inc. has completed the preconceptual design for its Helios stellarator fusion power plant, marking a significant advancement in commercial fusion technology. Helios aims to provide approximately 400 MW of net electricity with a thermal output of 1.1 GW, maintaining a high capacity factor of over 85%.

The design utilizes existing hardware and incorporates advancements such as a tokamak-like X-point divertor, improving gas exhaust efficiency. The architecture is geared toward scalability and cost-effectiveness, facilitating easier maintenance and operation.

Thea Energy plans to operate Helios in the 2030s, following its large-scale demonstration system, Eos, expected to be online by 2030. The company is also engaging with multiple states for Eos's siting, with an announcement anticipated in 2026.

Thea Energy was founded in 2022 and is supported by the U.S. Department of Energy's Milestone-Based Fusion Development Program.