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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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A war of attrition is now turning in opponents’ favor.
A solar developer’s defeat in Massachusetts last week reveals just how much stronger project opponents are on the battlefield after the de facto repeal of the Inflation Reduction Act.
Last week, solar developer PureSky pulled five projects under development around the western Massachusetts town of Shutesbury. PureSky’s facilities had been in the works for years and would together represent what the developer has claimed would be one of the state’s largest solar projects thus far. In a statement, the company laid blame on “broader policy and regulatory headwinds,” including the state’s existing renewables incentives not keeping pace with rising costs and “federal policy updates,” which PureSky said were “making it harder to finance projects like those proposed near Shutesbury.”
But tucked in its press release was an admission from the company’s vice president of development Derek Moretz: this was also about the town, which had enacted a bylaw significantly restricting solar development that the company was until recently fighting vigorously in court.
“There are very few areas in the Commonwealth that are feasible to reach its clean energy goals,” Moretz stated. “We respect the Town’s conservation go als, but it is clear that systemic reforms are needed for Massachusetts to source its own energy.”
This stems from a story that probably sounds familiar: after proposing the projects, PureSky began reckoning with a burgeoning opposition campaign centered around nature conservation. Led by a fresh opposition group, Smart Solar Shutesbury, activists successfully pushed the town to drastically curtail development in 2023, pointing to the amount of forest acreage that would potentially be cleared in order to construct the projects. The town had previously not permitted facilities larger than 15 acres, but the fresh change went further, essentially banning battery storage and solar projects in most areas.
When this first happened, the state Attorney General’s office actually had PureSky’s back, challenging the legality of the bylaw that would block construction. And PureSky filed a lawsuit that was, until recently, ongoing with no signs of stopping. But last week, shortly after the Treasury Department unveiled its rules for implementing Trump’s new tax and spending law, which basically repealed the Inflation Reduction Act, PureSky settled with the town and dropped the lawsuit – and the projects went away along with the court fight.
What does this tell us? Well, things out in the country must be getting quite bleak for solar developers in areas with strident and locked-in opposition that could be costly to fight. Where before project developers might have been able to stomach the struggle, money talks – and the dollars are starting to tell executives to lay down their arms.
The picture gets worse on the macro level: On Monday, the Solar Energy Industries Association released a report declaring that federal policy changes brought about by phasing out federal tax incentives would put the U.S. at risk of losing upwards of 55 gigawatts of solar project development by 2030, representing a loss of more than 20 percent of the project pipeline.
But the trade group said most of that total – 44 gigawatts – was linked specifically to the Trump administration’s decision to halt federal permitting for renewable energy facilities, a decision that may impact generation out west but has little-to-know bearing on most large solar projects because those are almost always on private land.
Heatmap Pro can tell us how much is at stake here. To give you a sense of perspective, across the U.S., over 81 gigawatts worth of renewable energy projects are being contested right now, with non-Western states – the Northeast, South and Midwest – making up almost 60% of that potential capacity.
If historical trends hold, you’d expect a staggering 49% of those projects to be canceled. That would be on top of the totals SEIA suggests could be at risk from new Trump permitting policies.
I suspect the rate of cancellations in the face of project opposition will increase. And if this policy landscape is helping activists kill projects in blue states in desperate need of power, like Massachusetts, then the future may be more difficult to swallow than we can imagine at the moment.
And more on the week’s most important conflicts around renewables.
1. Wells County, Indiana – One of the nation’s most at-risk solar projects may now be prompting a full on moratorium.
2. Clark County, Ohio – Another Ohio county has significantly restricted renewable energy development, this time with big political implications.
3. Daviess County, Kentucky – NextEra’s having some problems getting past this county’s setbacks.
4. Columbia County, Georgia – Sometimes the wealthy will just say no to a solar farm.
5. Ottawa County, Michigan – A proposed battery storage facility in the Mitten State looks like it is about to test the state’s new permitting primacy law.
A conversation with Jeff Seidman, a professor at Vassar College.
This week’s conversation is with Jeff Seidman, a professor at Vassar College and an avid Heatmap News reader. Last week Seidman claimed a personal victory: he successfully led an effort to overturn a moratorium on battery storage development in the town of Poughkeepsie in Hudson Valley, New York. After reading a thread about the effort he posted to BlueSky, I reached out to chat about what my readers might learn from his endeavors – and how they could replicate them, should they want to.
The following conversation was lightly edited for clarity.
So how did you decide to fight against a battery storage ban? What was your process here?
First of all, I’m not a professional in this area, but I’ve been learning about climate stuff for a long time. I date my education back to when Vox started and I read my first David Roberts column there. But I just happened to hear from someone I know that in the town of Poughkeepsie where I live that a developer made a proposal and local residents who live nearby were up in arms about it. And I heard the town was about to impose a moratorium – this was back in March 2024.
I actually personally know some of the town board members, and we have a Democratic majority who absolutely care about climate change but didn’t particularly know that battery power was important to the energy transition and decarbonizing the grid. So I organized five or six people to go to the town board meeting, wrote a letter, and in that initial board meeting we characterized the reason we were there as being about climate.
There were a lot more people on the other side. They were very angry. So we said do a short moratorium because every day we’re delaying this, peaker plants nearby are spewing SOx and NOx into the air. The status quo has a cost.
But then the other side, they were clearly triggered by the climate stuff and said renewables make the grid more expensive. We’d clearly pressed a button in the culture wars. And then we realized the mistake, because we lost that one.
When you were approaching getting this overturned, what considerations did you make?
After that initial meeting and seeing how those mentions of climate or even renewables had triggered a portion of the board, and the audience, I really course-corrected. I realized we had to make this all about local benefits. So that’s what I tried to do going forward.
Even for people who were climate concerned, it was really clear that what they perceived as a present risk in their neighborhood was way more salient than an abstract thing like contributing to the fight against climate change globally. So even for people potentially on your side, you have to make it about local benefits.
The other thing we did was we called a two-hour forum for the county supervisors and mayor’s association because we realized talking to them in a polarized environment was not a way to have a conversation. I spoke and so did Paul Rogers, a former New York Fire Department lieutenant who is now in fire safety consulting – he sounds like a firefighter and can speak with a credibility that I could never match in front of, for example, local fire chiefs. Winning them over was important. And we took more than an hour of questions.
Stage one was to convince them of why batteries were important. Stage two was to show that a large number of constituents were angry about the moratorium, but that Republicans were putting on a unified front against this – an issue to win votes. So there was a period where Democrats on the Poughkeepsie board were convinced but it was politically difficult for them.
But stage three became helping them do the right thing, even with the risk of there being a political cost.
What would you say to those in other parts of the country who want to do what you did?
If possible, get a zoning law in place before there is any developer with a specific proposal because all of the opposition to this project came from people directly next to the proposed project. Get in there before there’s a specific project site.
Even if you’re in a very blue city, don’t make it primarily about climate. Abstract climate loses to non-abstract perceived risk every time. Make it about local benefits.
To the extent you can, read and educate yourself about what good batteries provide to the grid. There’s a lot of local economic benefits there.
I am trying to put together some of the resources I used into a packet, a tool kit, so that people elsewhere can learn from it and draw from those resources.
Also, the more you know, the better. All those years of reading David Roberts and Heatmap gave me enough knowledge to actually answer questions here. It works especially when you have board members who may be sympathetic but need to be reassured.