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Climate Tech

Thea Energy Hits Milestone in Quest to Simplify Fusion

This fusion startup is ahead of schedule.

Fusion.
Heatmap Illustration/Getty Images, Thea Energy

Thea Energy, one of the newer entrants into the red-hot fusion energy space, raised $20 million last year as investors took a bet on the physics behind the company’s novel approach to creating magnetic fields. Today, in a paper being submitted for peer review, Thea announced that its theoretical science actually works in the real world. The company’s CEO, Brian Berzin, told me that Thea achieved this milestone “quicker and for less capital than we thought,” something that’s rare in an industry long-mocked for perpetually being 30 years away.

Thea is building a stellarator fusion reactor, which typically looks like a twisted version of the more common donut-shaped tokamak. But as Berzin explained to me, Thea’s stellarator is designed to be simpler to manufacture than the industry standard. “We don’t like high tech stuff,” Berzin told me — a statement that sounds equally anathema to industry norms as the idea of a fusion project running ahead of schedule. “We like stuff that can be stamped and forged and have simple manufacturing processes.”

The company thinks it can achieve simplicity via its artificial intelligence software, which controls the reactor’s magnetic field keeping the unruly plasma at the heart of the fusion reaction confined and stabilized. Unlike typical stellarators, which rely on the ultra-precise manufacturing and installment of dozens of huge, twisted magnets, Thea’s design uses exactly 450 smaller, simpler planar magnets, arranged in the more familiar donut-shaped configuration. These magnets are still able to generate a helical magnetic field — thought to keep the plasma better stabilized than a tokamak — because each magnet is individually controlled via the company’s software, just like “the array of pixels in your computer screen,” Berzin told me.

“We’re able to utilize the control system that we built and very specifically modulate and control each magnet slightly differently,” Berzin explained, allowing Thea to “make those really complicated, really precise magnetic fields that you need for a stellarator, but with simple hardware.”

This should make manufacturing a whole lot easier and cheaper, Berzin told me. If one of Thea’s magnets is mounted somewhat imperfectly, or wear and tear of the power plant slightly shifts its location or degrades its performance over time, Thea’s AI system can automatically compensate. “It then can just tune that magnet slightly differently — it turns that magnet down, it turns the one next to it up, and the magnetic field stays perfect,” Berzin explained. As he told me, a system that relies on hardware precision is generally much more expensive than a system that depends on well-designed software. The idea is that Thea’s magnets can thus be mass manufactured in a way that’s conducive to “a business versus a science project.”

In 2023, Thea published a technical report proving out the physics behind its so-called “planar coil stellarator,” which allowed the company to raise its $20 million Series A last year, led by the climate tech firm Prelude Ventures. To validate the hardware behind its initial concept, Thea built a 3x3 array of magnets, representative of one section of its overall “donut” shaped reactor. This array was then integrated with Thea’s software and brought online towards the end of last year.

The results that Thea announced today were obtained during testing last month, and prove that the company can create and precisely control the complex magnetic field shapes necessary for fusion power. These results will allow the company to raise a Series B in the “next couple of years,” Berzin said. During this time, Thea will be working to scale up manufacturing such that it can progress from making one or two magnets per week to making multiple per day at its New Jersey-based facility.

The company’s engineers are also planning to stress test their AI software, such that it can adapt to a range of issues that could arise after decades of fusion power plant operation. “So we’re going to start breaking hardware in this device over the next month or two,” Berzin told me. “We’re purposely going to mismount a magnet by a centimeter, put it back in and not tell the control system what we did. And then we’re going to purposely short out some of the magnetic coils.” If the system can create a strong, stable magnetic field anyway, this will serve as further proof of concept for Thea’s software-oriented approach to a simplified reactor design.

The company is still years away from producing actual fusion power though. Like many others in the space, Thea hopes to bring fusion electrons to the grid sometime in the 2030s. Maybe this simple hardware, advanced software approach is what will finally do the trick.

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Q&A

How to Build a Socially Responsible Data Center

Chatting with DER Task Force’s Duncan Campbell.

The Fight Q&A subject.
Heatmap Illustration/Getty Images

This week’s conversation is with Duncan Campbell of DER Task Force and it’s about a big question: What makes a socially responsible data center? Campbell’s expansive background and recent focus on this issue made me take note when he recently asked that question on X. Instead of popping up in his replies, I asked him to join me here in The Fight. So shall we get started?

Oh, as always, the following conversation was lightly edited for clarity.

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Hotspots

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Plus the week’s biggest development fights.

The United States.
Heatmap Illustration/Getty Images

1. LaPorte County, Indiana — If you’re wondering where data centers are still being embraced in the U.S., look no further than the northwest Indiana city of LaPorte.

  • LaPorte’s city council this week unanimously approved the expansion of a data center campus already under construction. Local elected officials were positively giddy at the public hearing on the vote, with city mayor Tim Doherty donning an orange t-shirt exclaiming a pro-AI pun: “TECH YEAH!”
  • Doherty explained his enthusiasm at the hearing in simple dollars and cents. State cuts to education had “put our local schools in an impossible position,” he said, asking: “Will the 15% in revenue sharing give our kids a superior education and the best chance at a future in this tech-driven world?”
  • That revenue sharing Doherty referenced was Microsoft’s deal in March with LaPorte’s school corporation, which stated 15% of the data center’s property tax revenue would go to the corporation for 20 years. So good was that deal some city councilors were vocally defiant against those who were opposed to the project expansion.
  • “Microsoft seems like they’re going to be a good partner for the city. They care. They’re presenting what I think is a good deal and trying to take care of people around them. So I’m all for it and if anybody wants to vote me out, hey, go for it,” councilor Roger Galloway told the hearing room.
  • The lesson? Give lots of money to education and you’re more likely to get a permit. Tale as old as the mining industry.

2. Cumberland County, New Jersey — A broader splashback against AI infrastructure is building in South Jersey.

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Spotlight

Data Centers Are Splintering the American Right

Mounting evidence shows that Republican voters are rapidly turning against artificial intelligence.

Tucker Carlson and a data center protest sign.
Heatmap Illustration/Getty Images, Library of Congress

The data center backlash is causing a crisis of faith amongst American conservatives over land use, energy abundance, and corporate regulation. The Republican Party — not to mention the politics of AI infrastructure — may never be the same.

In the last week, I’ve seen a surge of Republican politicians pushing to temporarily ban data centers in conservative states. In South Carolina, Representative Nancy Mace, a leading GOP gubernatorial primary candidate, called for a statewide moratorium on new data centers. In Texas, the sitting agriculture commissioner Sid Miller proposed the same for the Lone Star State. Ditto in North Dakota where the idea got backing from a GOP primary candidate for a Public Service Commission seat.

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