With a new $100M raise, Princeton's Thea Energy is now a top-funded fusion startup | TechCrunch

Thea Energy raised an oversubscribed $100 million Series B led by the U.S. Innovative Technology Fund, bringing total private investment to $130 million. The funding supports expanded manufacturing for smaller, uniquely designed tunable magnets and the start of construction of Eos, a power-plant-relevant demonstration device, beginning next year. The company previously completed a $20 million Series A in early 2024. Magnets are central to fusion reactor designs because they confine superheated plasma. Thea’s rectangular magnets can be tuned to form the overall magnetic field, likened to pixels that collectively create a desired image. Thea targets a stellarator approach, using dozens of regular magnets and software control to create a stellarator-shaped field within a simpler structure, including software compensation for misaligned test magnets.

"Thea Energy has raised an oversubscribed $100 million Series B led by U.S. Innovative Technology Fund, the fusion startup told TechCrunch. The sum places the company among the better funded fusion startups, giving it an improved chance at achieving a commercial reactor. The new funding will help Thea expand manufacturing for its uniquely designed smaller magnets and begin construction of Eos, its "power plant relevant" demonstration device, starting next year. Thea previously closed a $20 million Series A in early 2024. The new round brings total private investment to $130 million, the startup told TechCrunch."

"Magnets are at the core of many fusion power plant designs - they are what keeps the superheated matter called plasma compressed and burning hot enough to fuse atoms, which then release heat and energy. But Thea's magnets are different: each rectangular magnet can be tuned to create the shape the reactor's overall magnetic field. Thea likens these to pixels in a computer monitor, which collectively follow software's instructions to create the text and images the monitor displays."

"For Thea, that flexibility will be important. The type of reactor it's designing is known as a stellarator. Stellarators are capable of keeping plasma in very stable configurations, but to do so, they have to twist and bend to accommodate the plasma. That's in contrast to tokamaks, another leading magnetic design, which uses more brute force to keep plasma confined. But the irregular shape of a stellarator drives up complexity and cost for magnet manufacturing. Thea is betting that by shrouding its reactor core in dozens of regular magnets, it can use software to control the smaller, turnable magnets and create a stellarator-shaped magnetic field inside a much simpler physical structure."

"The software should also help with assembling the reactor. Thea has purposefully installed test magnets out of alignment, but the software was able to compensate. Thea hopes to complete it"

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