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This fusion startup is ahead of schedule.
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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The nonprofit laid off 36 employees, or 28% of its headcount.
The Trump administration’s funding freeze has hit the leading electrification nonprofit Rewiring America, which announced Thursday that it will be cutting its workforce by 28%, or 36 employees. In a letter to the team, the organization’s cofounder and CEO Ari Matusiak placed the blame squarely on the Trump administration’s attempts to claw back billions in funding allocated through the Greenhouse Gas Reduction Fund.
“The volatility we face is not something we created: it is being directed at us,” Matusiak wrote in his public letter to employees. Along with a group of four other housing, climate, and community organizations, collectively known as Power Forward Communities, Rewiring America was the recipient of a $2 billion GGRF grant last April to help decarbonize American homes.
Now, the future of that funding is being held up in court. GGRF funds have been frozen since mid-February as Lee Zeldin’s Environmental Protection Agency has tried to rescind $20 billion of the program’s $27 billion total funding, an effort that a federal judge blocked in March. While that judge, Tanya S. Chutkan, called the EPA’s actions “arbitrary and capricious,” for now the money remains locked up in a Citibank account. This has wreaked havoc on organizations such as Rewiring America, which structured projects and staffing decisions around the grants.
“Since February, we have been unable to access our competitively and lawfully awarded grant dollars,” Matusiak wrote in a LinkedIn post on Thursday. “We have been the subject of baseless and defamatory attacks. We are facing purposeful volatility designed to prevent us from fulfilling our obligations and from delivering lower energy costs and cheaper electricity to millions of American households across the country.”
Matusiak wrote that while “Rewiring America is not going anywhere,” the organization is planning to address said volatility by tightening its focus on working with states to lower electricity costs, building a digital marketplace for households to access electric upgrades, and courting investment from third parties such as hyperscale cloud service providers, utilities, and manufacturers. Matusiak also said Rewiring America will be restructured “into a tighter formation,” such that it can continue to operate even if the GGRF funding never comes through.
Power Forward Communities is also continuing to fight for its money in court. Right there with it are the Climate United Fund and the Coalition for Green Capital, which were awarded nearly $7 billion and $5 billion, respectively, through the GGRF.
What specific teams within Rewiring America are being hit by these layoffs isn’t yet clear, though presumably everyone let go has already been notified. As the announcement went live Thursday afternoon, it stated that employees “will receive an email within the next few minutes informing you of whether your role has been impacted.”
“These are volatile and challenging times,” Matusiak wrote on LinkedIn. “It remains on all of us to create a better world we can all share. More so than ever.”
A battle ostensibly over endangered shrimp in Kentucky
A national park is fighting a large-scale solar farm over potential impacts to an endangered shrimp – what appears to be the first real instance of a federal entity fighting a solar project under the Trump administration.
At issue is Geenex Solar’s 100-megawatt Wood Duck solar project in Barren County, Kentucky, which would be sited in the watershed of Mammoth Cave National Park. In a letter sent to Kentucky power regulators in April, park superintendent Barclay Trimble claimed the National Park Service is opposing the project because Geenex did not sufficiently answer questions about “irreversible harm” it could potentially pose to an endangered shrimp that lives in “cave streams fed by surface water from this solar project.”
Trimble wrote these frustrations boiled after “multiple attempts to have a dialogue” with Geenex “over the past several months” about whether battery storage would exist at the site, what sorts of batteries would be used, and to what extent leak prevention would be considered in development of the Wood Duck project.
“The NPS is choosing to speak out in opposition of this project and requesting the board to consider environmental protection of these endangered species when debating the merits of this project,” stated the letter. “We look forward to working with the Board to ensure clean water in our national park for the safety of protection of endangered species.”
On first blush, this letter looks like normal government environmental stewardship. It’s true the cave shrimp’s population decline is likely the result of pollution into these streams, according to NPS data. And it was written by career officials at the National Park Service, not political personnel.
But there’s a few things that are odd about this situation and there’s reason to believe this may be the start of a shift in federal policy direction towards a more critical view of solar energy’s environmental impacts.
First off, Geenex has told local media that batteries are not part of the project and that “several voicemails have been exchanged” between the company and representatives of the national park, a sign that the company and the park have not directly spoken on this matter. That’s nothing like the sort of communication breakdown described in the letter. Then there’s a few things about this letter that ring strange, including the fact Fish and Wildlife Service – not the Park Service – ordinarily weighs in on endangered species impacts, and there’s a contradiction in referencing the Endangered Species Act at a time when the Trump administration is trying to significantly pare back application of the statute in the name of a faster permitting process. All of this reminds me of the Trump administration’s attempts to supposedly protect endangered whales by stopping offshore wind projects.
I don’t know whether this solar farm’s construction will indeed impact wildlife in the surrounding area. Perhaps it may. But the letter strikes me as fascinating regardless, given the myriad other ways federal agencies – including the Park Service – are standing down from stringent environmental protection enforcement under Trump 2.0.
Notably, I reviewed the other public comments filed against the project and they cite a litany of other reasons – but also state that because the county itself has no local zoning ordinance, there’s no way for local residents or municipalities opposed to the project to really stop it. Heatmap Pro predicts that local residents would be particularly sensitive to projects taking up farmland and — you guessed it — harming wildlife.
Barren County is in the process of developing a restrictive ordinance in the wake of this project, but it won’t apply to Wood Duck. So opponents’ best shot at stopping this project – which will otherwise be online as soon as next year – might be relying on the Park Service to intervene.
And more on the week’s most important conflicts around renewable energy.
1. Dukes County, Massachusetts – The Supreme Court for the second time declined to take up a legal challenge to the Vineyard Wind offshore project, indicating that anti-wind activists' efforts to go directly to the high court have run aground.
2. Brooklyn/Staten Island, New York – The battery backlash in the NYC boroughs is getting louder – and stranger – by the day.
3. Baltimore County, Maryland – It’s Ben Carson vs. the farmer near Baltimore, as a solar project proposed on the former Housing and Urban Development secretary’s land is coming under fire from his neighbors.
4. Mecklenburg County, Virginia – Landowners in this part of Virginia have reportedly received fake “good neighbor agreement” letters claiming to be from solar developer Longroad Energy, offering large sums of cash to people neighboring the potential project.
5. York County, South Carolina – Silfab Solar is now in a bitter public brawl with researchers at the University of South Carolina after they released a report claiming that a proposed solar manufacturing plant poses a significant public risk in the event of a chemical emissions release.
6. Jefferson Davis County, Mississippi – Apex Clean Energy’s Bluestone Solar project was just approved by the Mississippi Public Service Commission with no objections against the project.
7. Plaquemine Parish, Louisiana – NextEra’s Coastal Prairie solar project got an earful from locals in this parish that sits within the Baton Rouge metro area, indicating little has changed since the project was first proposed two years ago.
8. Huntington County, Indiana – Well it turns out Heatmap’s Most At-Risk Projects of the Energy Transition has been right again: the Paddlefish solar project has now been indefinitely blocked by this county under a new moratorium on the project area in tandem with a new restrictive land use ordinance on solar development overall.
9. Albany County, Wyoming – The Rail Tie wind farm is back in the news again, as county regulators say landowners feel misled by Repsol, the project’s developer.
10. Klickitat County, Washington – Cypress Creek Renewables is on a lucky streak with a solar project near Goldendale, Washington, getting to bypass local opposition from the nearby Yakama Nation.
11. Pinal County, Arizona – A large utility-scale NextEra solar farm has been rejected by this county’s Board of Supervisors.