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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 lookahead with Heatmap’s own Emily Pontecorvo, Matthew Zeitlin, and Jillian Goodman.
2025 has been a rough year for climate and energy news. But enough about that. Let’s start looking at 2026!
On this week’s episode of Shift Key, Rob is joined by some of Heatmap’s writers and editors to discuss our biggest stories and predictions for 2026 — what we’re tracking, what could surprise us, and what could happen next. We also discuss a recent op-ed in The New York Times arguing that Democrats should work more closely with the U.S. oil and gas industry. Today’s panel includes Heatmap’s founding staff writer Emily Pontecorvo, staff writer Matthew Zeitlin, and deputy editor Jillian Goodman.
Shift Key is hosted by Robinson Meyer, the founding executive editor of Heatmap, and Jesse Jenkins, a professor of energy systems engineering at Princeton University. Jesse is off this week.
Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, or wherever you get your podcasts.
You can also add the show’s RSS feed to your podcast app to follow us directly.
Here is an excerpt from our conversation:
Robinson Meyer: I was thinking when Matt was talking about how different the current moment is from 2020 that back then, here was this idea that there was some risk, maybe, that some costs would go up a little. But inflation had been out of the picture for so long that we were in an environment where unemployment was the concern and not the price level, and so the idea that prices might go up a tiny bit in exchange for economic activity seemed like an okay trade.
And I would actually say, this is where I think there’s some potential for a comeback for more traditional types of environmental and climate activism in 2026, which is, the unemployment rate is currently 4.6%, as of a release last week, which historically, it hasn’t been above 4.6% very much in the past several decades. And when it is above 4.6% usually means unemployment’s about to spike.
And I think in a world where we switch from talking about affordability to talking about unemployment and a lack of general economic activity — especially in a world where AI is a big deal and people are very worried about job loss from AI, suddenly all the ideas about generating economic activity by doing kind of pro-social decarbonization activities are going to swing right back into the conversation.
And we know what a Donald Trump administration is like when prices are increasing by 3% a year, and that is, he’s not very popular. We don’t know what a Donald Trump administration is like when unemployment’s at 5%, or 5.5%. And if that were to happen, the floor could really drop out, and we could see a huge swing back to the type of policies that we were talking about not so long ago.
Mentioned:
Trump Uses ‘National Security’ to Freeze Offshore Wind Work
Matthew Yglesias’ op-ed: Obama Supported It. The Left in Canada and Norway Does. Why Don’t Democrats?
Emily on California cities’ new heat pump rules
The House Just Passed Permitting Reform. Now Comes the Hard Part.
This episode of Shift Key is sponsored by …
Heatmap Pro brings all of our research, reporting, and insights down to the local level. The software platform tracks all local opposition to clean energy and data centers, forecasts community sentiment, and guides data-driven engagement campaigns. Book a demo today to see the premier intelligence platform for project permitting and community engagement.
Music for Shift Key is by Adam Kromelow.
Forget data centers. Fire is going to make electricity much more expensive in the western United States.
A tsunami is coming for electricity rates in the western United States — and it’s not data centers.
Across the western U.S., states have begun to approve or require utilities to prepare their wildfire adaptation and insurance plans. These plans — which can require replacing equipment across thousands of miles of infrastructure — are increasingly seen as non-negotiable by regulators, investors, and utility executives in an era of rising fire risk.
But they are expensive. Even in states where utilities have not yet caused a wildfire, costs can run into the tens or hundreds of millions of dollars. Of course, the cost of sparking a fire can be much higher.
At least 10 Western states have recently approved or are beginning to work on new wildfire mitigation plans, according to data from E9 Insights, a utility research and consulting firm. Some utilities in the Midwest and Southeast have now begun to put together their own proposals, although they are mostly at an earlier phase of planning.
“Almost every state in the West has some kind of wildfire plan or effort under way,” Sam Kozel, a researcher at E9, told me. “Even a state like Missouri is kicking the tires in some way.”
The costs associated with these plans won’t hit utility customers for years. But they reflect one more building cost pressure in the electricity system, which has been stressed by aging equipment and rising demand. The U.S. Energy Information Administration already expects wholesale electricity prices to increase 8.5% in 2026.
The past year has seen a new spate of plans. In October, Colorado’s largest utility Xcel Energy proposed more than $845 million in new spending to prepare for wildfires. The Oregon utility Portland General Electric received state approval to spend $635 million on “compliance-related upgrades” to its distribution system earlier this month. That category includes wildfire mitigation costs.
The Public Utility Commission of Texas issued its first mandatory wildfire-mitigation rules last month, which will require utilities and co-ops in “high-risk” areas to prepare their own wildfire preparedness programs.
Ultimately, more than 140 utilities across 19 states have prepared or are working on wildfire preparedness plans, according to the Pacific Northwest National Laboratory.
It will take years for this increased utility spending on wildfire preparedness to show up in customers’ bills. That’s because utilities can begin spending money for a specific reason, such as disaster preparedness, as soon as state regulators approve their plan to do so. But utilities can’t begin passing those costs to customers until regulators review their next scheduled rate hike through a special process known as a rate case.
When they do get passed through, the plans will likely increase costs associated with the distribution system, the network of poles and wires that deliver electricity “the last mile” from substations to homes and businesses. Since 2019, rising distribution-related costs has driven the bulk of electricity price inflation in the United States. One risk is that distribution costs will keep rising at the same time that electricity itself — as well as natural gas — get more expensive, thanks to rising demand from data centers and economic growth.
California offers a cautionary tale — both about what happens when you don’t prepare for fire, and how high those costs can get. Since 2018, the state has spent tens of billions to pay for the aftermath of those blazes that utilities did start and remake its grid for a new era of fire. Yet it took years for those costs to pass through to customers.
“In California, we didn’t see rate increases until 2023, but the spending started in 2018,” Michael Wara, a senior scholar at the Woods Institute for the Environment and director of the Climate and Energy Policy Program at Stanford University, told me.
The cost of failing to prepare for wildfires can, of course, run much higher. Pacific Gas and Electric paid more than $13.5 billion to wildfire victims in California after its equipment was linked to several deadly fires in the state. (PG&E underwent bankruptcy proceedings after its equipment was found responsible for starting the 2018 Camp Fire, which killed 85 people and remains the deadliest and most destructive wildfire in state history.)
California now has the most expensive electricity in the continental United States.
Even the risk of being associated with starting a fire can cost hundreds of millions. In September, Xcel Energy paid a $645 million settlement over its role in the 2021 Marshall fire, even though it has not admitted to any responsibility or negligence in the fire.
Wara’s group began studying the most cost-effective wildfire investments a few years ago, when he realized the wave of cost increases that had hit California would soon arrive for other utilities.
It was partly “informed by the idea that other utility commissions are not going to allow what California has allowed,” Wara said. “It’s too expensive. There’s no way.”
Utilities can make just a few cost-effective improvements to their systems in order to stave off the worst wildfire risk, he said. They should install weather stations along their poles and wires to monitor actual wind conditions along their infrastructure’s path, he said. They should also install “fast trip” conductors that can shut off powerlines as soon as they break.
Finally, they should prepare — and practice — plans to shut off electricity during high-wind events, he said. These three improvements are relatively cheap and pay for themselves much faster than upgrades like undergrounding lines, which can take more than 20 years to pay off.
Of course, the cost of failing to prepare for wildfires is much higher than the cost of preparation. From 2019 to 2023, California allowed its three biggest investor-owned utilities to collect $27 billion in wildfire preparedness and insurance costs, according to a state legislative report. These costs now make up as much as 13% of the bill for customers of PG&E, the state’s largest utility.
State regulators in California are currently considering the utility PG&E’s wildfire plan for 2026 to 2028, which calls for undergrounding 1,077 miles of power lines and expanding vegetation management programs. Costs from that program might not show up in bills until next decade.
“On the regulatory side, I don’t think a lot of these rate increases have hit yet,” Kozel said.
California may wind up having an easier time adapting to wildfires than other Western states. About half of the 80 million people who live in the west live in California, according to the Census Bureau, meaning that the state simply has more people who can help share the burden of adaptation costs. An outsize majority of the state’s residents live in cities — which is another asset, since wildfire adaptation usually involves getting urban customers to pay for costs concentrated in rural areas.
Western states where a smaller portion of residents live in cities, such as Idaho, might have a harder time investing in wildfire adaptation than California did, Wara said.
“The costs are very high, and they’re not baked in,” Wara said. “I would expect electricity cost inflation in the West to be driven by this broadly, and that’s just life. Climate change is expensive.”
The administration has already lost once in court wielding the same argument against Revolution Wind.
The Trump administration says it has halted all construction on offshore wind projects, citing “national security concerns.”
Interior Secretary Doug Burgum announced the move Monday morning on X: “Due to national security concerns identified by @DeptofWar, @Interior is PAUSING leases for 5 expensive, unreliable, heavily subsidized offshore wind farms!”
There are only five offshore wind projects currently under construction in U.S. waters: Vineyard Wind, Revolution Wind, Coastal Virginia Offshore Wind, Sunrise Wind, and Empire Wind. Burgum confirmed to Fox Business that these were the five projects whose leases have been targeted for termination, and that notices were being sent to the project developers today to halt work.
“The Department of War has come back conclusively that the issues related to these large offshore wind programs create radar interference, create genuine risk for the U.S., particularly related to where they are in proximity to our East Coast population centers,” Burgum told the network’s Maria Bartiromo.
David Schoetz, a spokesperson for Empire Wind's developer Equinor, told me the company is “aware of the stop work order announced by the Department of Interior,” and that the company is “evaluating the order and seeking further information from the federal government.” Schoetz added that we should ”expect more to come” from the company.
This action takes a kernel of truth — that offshore wind can cause interference with radar communication — and blows it up well beyond its apparent implications. Interior has cited reports from the military they claim are classified, so we can’t say what fresh findings forced defense officials to undermine many years of work to ensure that offshore wind development does not impede security or the readiness of U.S. armed forces.
The Trump administration has already lost once in court with a national security argument, when it tried to halt work on Revolution Wind citing these same concerns. The government’s case fell apart after project developer Orsted presented clear evidence that the government had already considered radar issues and found no reason to oppose the project. The timing here is also eyebrow-raising, as the Army Corps of Engineers — a subagency within the military — approved continued construction on Vineyard Wind just three days ago.
It’s also important to remember where this anti-offshore wind strategy came from. In January, I broke news that a coalition of activists fighting against offshore wind had submitted a blueprint to Trump officials laying out potential ways to stop projects, including those already under construction. Among these was a plan to cancel leases by citing national security concerns.
In a press release, the American Clean Power Association took the Trump administration to task for “taking more electricity off the grid while telling thousands of American workers to leave the job site.”
“The Trump Administration’s decision to stop construction of five major energy projects demonstrates that they either don’t understand the affordability crises facing millions of Americans or simply don't care,” the group said. “On the first day of this Administration, the President announced an energy emergency. Over the last year, they worked to create one with electricity prices rising faster under President Trump than any President in recent history."
What comes next will be legal, political and highly dramatic. In the immediate term, it’s likely that after the previous Revolution victory, companies will take the Trump administration to court seeking preliminary injunctions as soon as complaints can be drawn up. Democrats in Congress are almost certainly going to take this action into permitting reform talks, too, after squabbling over offshore wind nearly derailed a House bill revising the National Environmental Policy Act last week.
Heatmap has reached out to all of the offshore wind developers affected, and we’ll update this story if and when we hear back from them.
Editor’s note: This story has been updated to reflect comment from Equinor and ACP.