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Eos Integrated Stellarator

Eos: A simpler way to build the stellarator

Thea Energy’s Eos integrated stellarator facility will create power plant relevant, steady-state fusion using the Company’s simplified architecture. Eos is a critical step towards an abundant source of zero-emission energy, and Thea Energy’s first commercial fusion power plant, Helios.

Thea Energy was founded to create a faster and simpler approach to commercializing fusion energy. Eos leverages arrays of mass-manufacturable planar (flat) magnet hardware and revolutionary software-based control systems.

Derisking the leading approach to scalable and efficient fusion energy

  • A large-scale planar coil stellarator. The operation of Eos will catalyze the subsequent deployment of fusion energy on the grid at scale via the Company’s Helios power plant. Eos not only achieves significant fusion performance, but also de-risks the programmatic / executional aspects of building a power plant.
  • World-leading fusion performance. Eos will achieve a triple product of 1021 keVs/m3 (a benchmark of density, temperature, and confinement time, and key figure toward achieving net energy gain for fusion power plants).
  • More than just a science project – a fusion system capable of nearer-term commercial operation. After Eos achieves the world’s best stellarator system performance, the device will begin a second phase for long-term operation to de-risk other fusion power plant technologies and breed radioisotopes using a deuterium-deuterium (D-D) fusion.
  • Dynamic software controls for fusion hardware. Thea Energy’s planar coil array and software stack uniquely enable systems to be continually updated and re-optimized, unlike the single fixed operating point of 3D modular coil stellarators.
  • Section-based system maintenance, minimizing downtime. Thea Energy’s planar coils create efficient, sector-based maintenance where entire sections of the system can be fully removed, with a minimum number of unique parts. This minimizes downtime and allows for offline maintenance. 
  • No engineering miracles required. Eos has a maximum magnetic field of approximately 16 T at the coils. Eos will effectively confine a fusion plasma while efficiently utilizing HTS tape and eliminating failure mode risks. 
  • Established physics basis. Stellarators are one of the most well-studied fusion technologies. Originally invented in the 1950s at PPPL, the stellarator is one of the only fusion concepts that has reached the temperatures required to sustain fusion. 
  • Highly efficient. Stellarators do not need current drive systems, enabling high-efficiency operation with low recirculating power. 
  • Continuous operation in steady state. Stellarators are inherently stable systems that can operate with 24-hour+ long pulses and without risk of disruptions.
  • An optimal power plant architecture. Unlike other proposed stellarator architectures, Thea Energy’s quasi-symmetric design allows for magnets to be placed further away from the plasma, providing ample room for blanket systems relevant for a deuterium-tritium (D-T) fusion power plant, and 30+ year magnet lifetimes.
  • Leveraging HTS technology. Advances in high temperature superconductors and the growing supply chain have facilitated Thea Energy and the entire fusion industry to create more efficient systems with stronger magnetic fields using smaller devices.

The long-term fusion winner via continual system re-optimization and software learning

We have optimized Eos to relax engineering and manufacturing requirements, with simpler hardware and 450+ independent variables to continually re-optimize performance across a lifetime of real-world system operation. Our architecture has orders of magnitude more tolerance to hardware, manufacturing error, construction variability, and system wear and tear than 3D modular coil stellarators. 

Our team has been continuously improving stellarator physics and engineering using the latest advances in high-speed computation and AI.

Over the past year, recent breakthroughs have allowed us to utilize roughly 50% the number of coils compared to the originally proposed system design. Eos is now further optimized to only require one size shaping coil. This enables the mass manufacture of magnet hardware via simple, cost-effective means (think automotive assembly lines). This reduction in coils and number of unique parts also creates modularity across system components and subsequently more efficient maintenance. Additional space allows for entire system sections to be more easily assembled or removed for maintenance, and for various components such as ports, plumbing, wiring, and heating subsystems.

Eos uses a set of planar encircling coils and planar shaping coils that work together additively to precisely and efficiently create stellarator magnetic fields. This planar coil stellarator architecture can create one of the best (i.e. most accurate and efficient) coil-to-plasma field reconstructions. Our dynamically controlled planar coils can produce magnetic fields with more than 10x better optimization than existing stellarator systems such as W7-X (Bonofiglo 2025 and Landreman and Paul 2022).

Detailed peer-reviewed findings on Thea Energy’s breakthroughs including Eos and the system’s core magnet technologies can be found under Presentations & Publications.

Simpler hardware. Practical fusion.

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