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For a while First Solar looked like a “Liberation Day” winner. Now its first quarter results suggest otherwise.

When Donald Trump unveiled his now-infamous chart of “reciprocal” tariffs, most of the stock market shuddered — but there were a few exceptions, including the American solar manufacturer First Solar. While the market in the days following “Liberation Day” was on a hunt and destroy mission for stocks of renewables companies known to be heavily exposed to Asia or independent power producers, First Solar stayed roughly flat.
It’s not flat anymore. The company reported first quarter earnings on Tuesday that were short of analysts’ expectations and lowered its expected revenue and profit for the rest of the year citing disruptions from tariffs. The stock has fallen more than 9% on Wednesday, and is down a third so far this year.
“While FSLR” — a.k.a. First Solar — “is the US solar manufacturing bellwether, they are not immune to the far-reaching tariff environment,” Andrew Perocco, a Morgan Stanley analyst, wrote in a note to clients. He also estimated that almost half of First Solar’s manufacturing capacity is in Asia.
The company’s sobering results and warnings about how tariffs could affect their business is a sign that the entire green energy business is likely at risk from uncertain trade policy, even the companies thought to be insulated.
First Solar and other companies’ tariff-affected financial results also show that the Inflation Reduction Act has only been partially successful at boosting American production of green energy technology, and that the country’s green industries are still deeply intertwined with Asian and Chinese production.
“We had been expecting negative effects from tariffs for First Solar, but the impact was greater than we expected,” Brett Castelli, an analyst at Morningstar, wrote in a note to clients.
First Solar chief executive Mark Widmar said that the uncertainty about the reciprocal tariffs — set to back into effect in July absent new trade deals — “has created a challenge to quantifying the precise tariff rate that would be applied to our module shipments into and beyond the second half of this year.”
Widmar said the company expects to move its manufacturing facility in India “away from exports to the U.S.,” and instead will have it produce solar panels for the domestic Indian market. Its factories in Malaysia and Vietnam may see reduced production due to “potentially reduced U.S. demand environment for non-domestic product.”
Widmar also called out the ever-evolving policy around Chinese solar imports into the United States. Solar panels from China itself, as well as four Southeast Asian nations face punitive import duties as high as 3,521% after the federal government determined Chinese companies were “dumping” panels on the U.S. market and trying to circumvent tariffs by moving production to neighboring countries. Widmar said there had been a “surge” of cells and modules from Laos and Indonesia.
“We have no doubt that these Chinese manufacturers are also seeking to establish production and other regions around the world, such as Saudi Arabia, forcing us into a continued game of whack-a-mole,” Widmar said.
Several analysts downgraded the company, with Jefferies analyst Julien Dumoulin-Smith writing in a note to clients that there were questions about “about the profitability of its core business.”
That the tariffs have affected First Solar, long held out as a kind of American solar manufacturing national champion, bodes poorly for much of the rest of the renewable industry, which is still often tightly linked to Asian nations and especially China.
There have been some hints that there’s no safe ground from tariffs in the U.S. clean energy industry. The most vertically integrated green technology company in the United States, Tesla, has flagged repeatedly to investors and the public that it’s at risk from tariffs, whether for certain parts of its cars or, especially, for its stationary storage batteries — which, like much of the rest of the storage industry, relies on a Chinese supply chain.
“Given the majority of the [battery electric storage systems] components with some dependency on Chinese supply chain, solar-plus-storage projects in particular may face significantly increased costs,” Widmar said. Morgan Stanley’s Perocco described Widmar’s comments on solar-plus-storage as a “negative read-through for other utility-scale solar and storage exposed stocks,” such as Array Technologies, Shoals Technology Group, and Fluence. Array and Shoals are down 10% and 3% respectively, while Fluence is about flat on the day.
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Plus a pre-seed round for a moon tech company from Latvia.
The nuclear headlines just keep stacking up. This week, Inertial Enterprises landed one of the largest Series A rounds I’ve ever seen, making it an instant contender in the race to commercialize fusion energy. Meanwhile, there was a smaller raise for a company aiming to squeeze more juice out of the reactors we already have.
Elsewhere over in Latvia, investors are backing an early stage bid to bring power infrastructure to the moon, while in France, yet another ultra-long-duration battery energy storage company has successfully piloted their tech.
Inertia Enterprises, yet another fusion energy startup, raised an eye-popping $450 million Series A round this week, led by Bessemer Venture Partners with participation from Alphabet’s venture arm GV, among others. Founded in 2024 and officially launched last summer, the company aims to develop a commercial fusion reactor based on the only experiment yet to achieve scientific breakeven, the point at which a fusion reaction generates more energy than it took to initiate it.
This milestone was first reached in 2022 at Lawrence Livermore National Laboratory’s National Ignition Facility, using an approach known as inertial confinement fusion. In this method, powerful lasers fire at a small pellet of fusion fuel, compressing it until the extremely high temperature and pressure cause the atoms inside to fuse and release energy. Annie Kritcher, who leads LLNL’s inertial confinement fusion program, is one of the cofounders of Inertia, alongside Twilio co-founder Jeff Lawson and Stanford professor Mike Dunne, who formerly led a program at the lab to design a power plant based on its approach to fusion.
The Inertia team plans to commercialize LLNL’s breakthrough by developing a new fusion laser system it’s calling Thunderwall, which it says will be 50 times more powerful than any laser of its type to date. Inertia isn’t the only player trying to commercialize laser-driven fusion energy — Xcimer Energy, for example, raised a $100 million Series A in 2024 — but with its recent financing, it’s now by far the best capitalized of the bunch.
As Lawson, the CEO of the new endeavor said in the company’s press release, “Our plan is clear: build on proven science to develop the technology and supply chain required to deliver the world’s highest average power laser, the first fusion target assembly plant, and the first gigawatt, utility-scale fusion power plant to the grid.” Great, but how soon can they do it? The goal, he says, is to “make this real within the next decade.”
In more nuclear news, the startup Alva Energy launched from stealth on Thursday with $33 million in funding and a proposal to squeeze more capacity out of the existing nuclear fleet by retrofitting pressurized-water reactors. The round was led by the venture firm Playground Global.
The startup plans to boost capacity by building new steam turbines and electricity generators adjacent to existing facilities, such that plants can stay online during the upgrade. Then when a plant shuts down for scheduled maintenance, Alva will upgrade its steam generator within the nuclear containment dome. That will allow the system to make 20% to 30% more steam, to be handled by the newly built turbine-generator system.
The company estimates that these retrofits will boost each reactor’s output by 200 megawatts to 300 megawatts. Applied across the dozens of existing facilities that could be similarly upgraded, Alva says this strategy could yield roughly 10 new gigawatts of additional nuclear capacity through the 2030s — the equivalent of building about 10 new large reactors.
Biden’s Department of Energy identified this strategy, known as “uprating”, as capable of adding 2 gigawatts to 8 gigawatts of new capacity to the grid. Alva thinks it can go further. The company promises to manage the entire uprate process from ensuring regulatory compliance to the procurement and installation of new reactor components. The company says its upgrades could be deployed as quickly as gas turbines are today — a five- to six-year timeline — at a comparable cost of around $1 billion per gigawatt.
Deep Space Energy, a Latvian space tech startup, has closed a pre-seed funding round to advance its goal of becoming a commercial supplier of electricity for space missions on the moon, Mars, or even deeper into space where sunlight is scarce. The company is developing power systems that convert heat from the natural decay of radioisotopes — unstable atoms that emit radiation as they decay — into electricity.
While it’s still very early-stage, this tech’s first application will likely be backup power for defense satellites. Long term, Deep Space Energy says it “aims to focus on the moon economy” by powering rovers and other lunar installations, supporting Europe’s goal of increasing its space sovereignty by reducing its reliance on U.S. defense assets such as satellites. While radioisotope generators are already used in some space missions, the company says its system requires five times less fuel than existing designs.
Roughly $400,000 of the funding came from equity investments from the Baltic-focused VC Outlast Fund and a Lithuanian angel investor. The company also secured nearly $700,000 from public contracts and grants from the European Space Agency, the Latvian Government, and a NATO program to accelerate innovation with dual-use potential for both defense and commercial applications.
As I wrote a few weeks ago, Form Energy’s iron-air battery isn’t the only player targeting 100-plus hours of low-cost energy storage. In that piece, I highlighted Noon Energy, a startup that recently demoed its solid-oxide fuel cell system. But there’s another company aiming to compete even more directly with Form by bringing its own iron-air battery to the European market: Ore Energy. And it just completed a grid-connected pilot, something Form has yet to do.
Ore piloted its 100-hour battery at an R&D center in France run by EDF, the state-owned electric utility company. While the company didn’t disclose the battery’s size, it said the pilot demonstrated its ability to discharge energy continuously for about four days while integrating with real-world grid operations. The test was supported by the European Union’s Storage Research Infrastructure Eco-System, which aims to accelerate the development of innovative storage solutions, and builds on the startup’s earlier grid-connected installation at a climate tech testbed in the Netherlands last summer.
Founded in 2023, Ore plans to scale quickly. As Bas Kil, the company’s business development lead, told Latitude Media after its first pilot went live, “We’re not planning to do years and years of pilot-scale [projects]; we believe that our system is now ready for commercial deployment.” According to Latitude, Ore aims to reach 50 gigawatt-hours of storage per year by 2030, an ambitious goal considering its initial grid-connected battery had less than one megawatt-hour of capacity. So far, the company has raised just shy of $30 million to date, compared to Form’s $1.2 billion.
Battery storage manufacturer and virtual power plant operator Sonnen, together with the clean energy financing company Solrite, have launched a Texas-based VPP composed exclusively of home batteries. They’re offering customers a Solrite-owned 60-kilowatt-hour battery for a $20 monthly fee, in exchange for a fixed retail electricity rate of 12 cents per kilowatt-hour — a few cents lower than the market’s average — and the backup power capability inherent to the system. Over 3,000 customers have already enrolled, and the companies are expecting up to 10,000 customers to join by year’s end.
The program is targeting Texans with residential solar who previously sold their excess electricity back to the grid. But now that there’s so much cheap, utility-scale solar available in Texas, electricity retailers simply aren’t as incentivized to offer homeowners favorable rates. This has left many residents with “stranded” solar assets, turning them into what the companies call “solar orphans” in need of a new way to make money on their solar investment. Customers without rooftop solar can participate in the program as well, though they don’t get a catchy moniker.
Current conditions: New Orleans is expecting light rain with temperatures climbing near 90 degrees Fahrenheit as the city marks the 20th anniversary of Hurricane Katrina • Torrential rains could dump anywhere from 8 to 12 inches on the Mississippi Valley and the Ozarks • Japan is sweltering in temperatures as high as 104 degrees.
President Donald Trump has done what he didn’t dare attempt during his first term, repealing the finding that provided the legal basis for virtually all federal regulations to curb greenhouse gas emissions. By rescinding the 2009 “endangerment finding,” which established that planet-heating emissions harm human health and therefore qualify for restrictions under the Clean Air Act, the Trump administration hopes to unwind all rules on pollution from tailpipes, trucks, power plants, pipelines, and drilling sites all in one fell swoop. “This is about as big as it gets,” Trump said alongside Environmental Protection Agency Administrator Lee Zeldin at a White House event Thursday.
The repeal, which is sure to face legal challenges, opens up what Reuters called a new front in the legal wars over climate change. Until now, the Supreme Court had declined to hear so-called public nuisance cases brought by activists against fossil fuel companies on the grounds that the legal question of emissions was being sorted out through federal regulations. By eliminating those rules outright, litigants could once again have new standing to sue over greenhouse gas emissions. To catch up on the endangerment finding in general, Heatmap’s Robinson Meyer and Emily Pontecorvo put together a handy explainer here.
A bill winding its way through Ohio’s Republican-controlled state legislature would put new restrictions on development of wind and solar projects. The state already makes solar and wind developers jump over what Canary Media called extra hurdles that “don’t apply to fossil-fueled or nuclear power plants, including counties’ ability to ban projects.” For example, siting authorities defer to local opposition on renewable energy but “grant opponents little say over where drilling rigs and fracking waste can go.”
The new legislation would make it state policy “in all cases” for new power plants to “employ affordable, reliable, and clean energy sources.” What qualifies as “affordable, reliable, and clean”? Pretty much everything except wind and solar, potentially creating a total embargo on the energy sources at any utility scale. The legislation mirrors a generic bill promoted to states by the American Legislative Exchange Council, a right-wing policy shop.
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China’s carbon dioxide emissions fell by 1% in the last three months of 2025, amounting to a 0.3% drop for the full year. That’s according to a new analysis by Carbon Brief. The decline extends the “flat or falling” trend in China’s emissions that started in March 2024 and has now lasted nearly two years. Emissions from fossil fuels actually increased by 0.1%, but pollution from cement plunged 7%. While the grid remains heavily reliant on coal, solar output soared by 43% last year compared to 2024. Wind grew by 14% and nuclear by 8%. All of that allowed coal generation to fall by 1.9%.
At least one sector saw a spike in emissions: Chemicals, which saw emissions grow 12%. Most experts interviewed in Heatmap’s Insiders Survey said they viewed China has a climate “hero” for its emissions cuts. But an overhaul to the country’s electricity markets yielded a decline in solar growth last year that’s expected to stretch into this year.
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Rivian Automotive’s shares surged nearly 15% in after-hours trading Thursday when the electric automaker announced earnings that beat Wall Street’s expectations. While it cautioned that it would continue losing money ahead of the launch of its next-generation R2 mid-size SUV, the company said it would deliver 62,000 to 67,000 vehicles in 2026, up 47% to 59% compared with 2025. Rivian CEO RJ Scaringe told CNBC that the R2 would make up the “majority of the volume” of the business by the end of next year. He told investors 2025 was a “foundational year” for the company, but that 2026 would be “an inflection point.”
Another clean energy company is now hot on the stock market. SOLV Energy, a solar and battery storage construction contractor, secured market capitalization eclipsing $6 billion in the two days since it started trading on the Nasdaq. The company, according to Latitude Media, is “the first pure-play solar and storage” company in the engineering, procurement, and construction sector of the industry to go public since 2008.

Israel has never confirmed that it has nuclear weapons, but it’s widely believed to have completed its first operating warhead in the 1960s. Rather than give up its strategic ambiguity over its arsenal, Israel instead forfeited the development of civilian nuclear energy, which would have required opening up its weapons program to the scrutiny of regulators at the United Nations’ International Atomic Energy Agency. That apparently won’t stop the U.S. from building a reactor in Israel to power a joint industrial complex. Washington plans to develop a campus with an advanced microchip factory and data centers that would be powered by a small modular reactor, NucNet reported. So-called SMRs have yet to be built at a commercial scale anywhere in the world. But the U.S. government is betting that smaller, less powerful reactors purchased in packs can bring down the cost of building nuclear plants and appeal to fearful skeptics as a novel spin on the older technology.
In reality, SMRs are based on a range of designs, some of which closely mirror traditional, large-scale reactors but for the power output, and a growing chorus of critics say the economies of scale are needed to make nuclear projects pencil out. But the true value of SMRs is for off-grid power. As I wrote last week for Heatmap, if the U.S. government wants it for some national security concern, the price doesn’t matter as much.
Of all the fusion companies racing to build the first power plant, Helion’s promise of commercial electricity before the end of the decade has raised eyebrows for its ambition. But the company has hit a milestone. On Friday morning, Helion’s Polaris prototype became the first privately developed fusion reactor to use a deuterium-tritium fuel source. The machine also set a record with plasma temperatures 150 million degrees Celsius, smashing its own previous record of 100 million degrees with an earlier iteration of Helion’s reactor.
Rob and Jesse talk about the big Northeastern freeze.
The eastern United States just made it through a snowy, sleet-filled, and very frigid few weeks.
It tested adults and kids and local governments. It also tested the power grid — and gave us a view of what the grid’s biggest challenges might look like in the future.
On this week’s episode of Shift Key, Rob and Jesse announce some news about the show — and also debrief on how the Northeastern U.S. power grid performed during the past few weeks of unusually intense winter weather. They discuss why wintertime electricity demand is especially important to manage, whether it’s bad that New England got a whopping 40% of its electricity from oil, and how the region’s new transmission line to Quebec performed during the freeze. They also chat about how zero-carbon electricity could help manage grid stress.
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.
Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, or wherever you get your podcasts.
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Here is an excerpt from our conversation:
Robinson Meyer: Let’s zoom in on two specific challenges that New England in particular experienced during this winter storm. The first is something I referenced in the intro, which is that at peak, New England was actually generating 40% of its electricity from oil and really from diesel, which is crazy. I mean, oil and diesel, I think it’s crazy.
Jesse Jenkins: For me, I’m like- Everybody else thinks it’s crazy. I’ll tell you why I don’t think it’s crazy in a minute.
Meyer: Okay, well, let’s talk about this is a throwback. I mean you look at 40% of New England’s electricity coming from oil. This is like a throwback and, to the 1970s when the U.S. got a ton of electricity from oil, really only effectively cut off by the beginning of the Arab oil embargo and the energy crisis in the 1970s, ultimately prompting a return to coal, at least way back then.
I don’t know. I look at this and I go, something really has gone wrong. If New England’s getting 40% of its electricity from oil, that’s like the most possible polluting thing other than coal you could generate electricity from. But what do you think? I don’t know.
Jenkins: I look at it and I say, that’s probably what the future is going to look like in a lot more places across the country if we transition to a winter peaking system. And here’s why. So yeah, 40%, but for how many hours? For a week? For two weeks? That’s probably half a percent to one and a half percent of annual generation in New England.
So a lot of capacity, very little energy, right? That’s the perfect thing for peaking, right? And for prolonged to events like this. The alternative to that is you oversize gas pipelines and you oversize gas production to meet that extra 40% of New England generation that only occurs once every two years for 1% of the hours of the year. While there has been local environmental opposition and political opposition to building greater pipelines into the Northeast, the economics of that also don’t necessarily line up.
Gas generators had the option in New England to sign firm gas contracts that would have meant they were uninterruptible by local distribution companies. Those firm gas contracts could then help finance new gas pipeline construction or expansion. They chose not to do that. They chose instead to install oil tanks, diesel tanks on site, and to convert to dual fuel generators for these kinds of circumstances.
And the reason for that is that when you’re dealing with this sort of very infrequent event, what you want is something that costs very little upfront, but maybe has a very high variable cost when you consume it because you’re not going to consume very much of it, and you’re going to do it very infrequently. And so you don’t want a big fixed cost just sitting there all the time. Well, guess what a gas pipeline is? A giant fixed cost sitting there all the time.
Oil, on the other hand, is a consumable. It’s very expensive. Power prices go up when we’re using it, right? They’re a couple hundred dollars a megawatt hour at least. But you can store many days worth of fuel on site in oil tanks in a fairly compact landscape.
Oil is our default long duration energy storage right now, right? Until we invent something better and cleaner. And so for these kinds of rare events that only happen a couple percent of the hours of the year, just like we would like to have more batteries and more long duration energy storage to replace this in the near term, this is a sensible way to manage gas pipeline capacity peaks, right? Otherwise, we’re building, I don’t know what percentage, maybe 10% more total gas pipeline capacity. And that extra 10% increment, we’re basically never using. We don’t need it in the summer. We only need it 1% or 2% of the times when the system is at the sort of peak stress.
And so it’s a very logical economic solution to this problem. And while yes, it is dirty during the periods when we’re burning that oil, we are burning very little of it and for very short periods of time. You know, it’s a week or two every couple of years.
You can find a full transcript of the episode here.
Mentioned:
Why winter is becoming a tough time for the power grid
New England turned to oil-burning power plants during the cold snap
Quebec stopped sending hydropower during the Arctic storm
PJM’s review of its January cold weather operations
Previously on Shift Key: The Startup Trying to Put Geothermal Heat Pumps in America’s Homes
An early review (and photos) of the Rivian R2
This episode of Shift Key is sponsored by ...
Accelerate your clean energy career with Yale’s online certificate programs. Explore the 10-month Financing and Deploying Clean Energy program or the 5-month Clean and Equitable Energy Development program. Use referral code HeatMap26 and get your application in by the priority deadline for $500 off tuition to one of Yale’s online certificate programs in clean energy. Learn more at cbey.yale.edu/online-learning-opportunities.
Music for Shift Key is by Adam Kromelow.