American company unveils design for 400 MW fusion power plant

US energy company Thea Energy has unveiled its design for the Helios fusion power plant, intended to feed a steady 400 megawatts of electricity into the grid. The project is built around a compact stellarator that combines software-controlled adaptive magnets, a continuous plasma exhaust system and a design built with maintenance in mind.

How the reactor works

Stellarators confine the superheated plasma needed for fusion reactions using magnetic fields and are currently seen as one of the most promising directions in fusion energy. The main drawback of conventional designs is their bulky, complex three-dimensional modular coils. In the Helios project, these are replaced by a system of flat (planar) magnets under software control, which should make the design simpler and cheaper to build.

Compared to similar projects, the plant is remarkably compact: the device's major radius is just 8 meters, reducing both the footprint required and the projected costs. Unlike many other fusion concepts, Helios has been designed from the outset for continuous operation and, according to its developers, is meant to serve as a stable source of power for the grid.

Modular maintenance and ambitious timelines

A key feature of the design is that the plant is divided into separate sectors, each of which can be serviced independently of the others. This means the fusion hardware remains accessible for maintenance throughout the plant's entire operating life.

Before building the power plant itself, however, Thea Energy plans to construct an experimental device called Eos — which the company says will be the first large-scale stellarator built with a planar-coil architecture, designed to test whether the technology is viable for a future commercial plant. There's still plenty of work to do — first developing, then testing the technology — which raises the question of how the company expects to hit its timeline: the Helios fusion power plant is slated to launch as early as the 2030s.

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Source: osel.cz