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Tuesday was a top three day for wildfire pollution, Stanford researchers have found. Wednesday will be worse.
UPDATE JUNE 8 AT 2:15 PM ET: Researchers have found that Wednesday was the worst day for wildfire pollution in American history. Read more.
Today — Wednesday, June 7 — is virtually guaranteed to be among the worst two days for wildfire smoke in American history, and possibly the worst day ever, a new and rapid analysis conducted by Stanford researchers suggests.
The research found that Tuesday was the third-worst day in American history for exposure to wildfire smoke on a population-weighted basis. Given that conditions have been worse on Wednesday than Tuesday, today is all but certain to rank even higher on the list, the researchers said. Not since California’s conflagrations in September 2020 — when the Bay Area clouded with soot and ash, and the sky over San Francisco turned flame-orange — have so many Americans been exposed to so much toxic wildfire smoke.
Stanford.
“It’s pretty off the charts,” Marshall Burke, an economist and sustainability professor at Stanford who led the research, told me. “It’s pretty historic. We’re talking about the most populated parts of the country just getting hammered.”
The new analysis drives home the importance of Thursday’s mass air-pollution event. From New York City to Norfolk, Virginia, and from Detroit to Ottawa, record-breaking levels of microscopic soot and ash canceled flights, concerts, and sporting events.
The new analysis looked at two variables: how intense the “dose” of wildfire smoke was, and how many people it affected. In essence, it focuses on the average of the American experience: On what days in history is a statistically random American likely to breathe the most wildfire smoke into their lungs? Tuesday and Wednesday of this week, it found, are likely among the top three to hold that distinction.
Although wildfire-driven air pollution reached higher concentrations in some parts of the West in 2020 and 2021, it never affected so many people, living in such a densely populated area. That is what makes this week different, Burke said. “It’s mainly due to the East Coast having so many people. It’s New York, Boston, D.C., Detroit. Out West, our cities are just smaller.”
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The finding also clarifies how much wildfire smoke the East Coast has already faced this year. As my colleague Jeva Lange showed, even before this week, East Coasters had faced worse wildfire-driven air pollution so far this year than Americans living out west. (That said, the Western fire season has only barely begun.)
Burke and his colleagues looked at data from 2006 to 2023. But given that the American population has grown, and wildfires have expanded in size, it is unlikely that wildfire smoke affected more people than before the current period.
The team cannot formally establish that today, Wednesday, was among the worst days in American history until the day ends and records become available. But the intensity of pollution already observed virtually guarantees that Wednesday is worse than Tuesday, Burke said: “I would be shocked if today doesn’t move up the list.”
Speaking in a separate conversation on Tuesday, Burke mused that some photos of New York’s ashy sky reminded him of California’s hellish wildfire experience three years earlier. “This looks like you're in California in August 2020 … not in New York City in early June,” he said at the time.
As his analysis later showed, he was more right than he realized.
We’ll update this story as more data becomes available for today.
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You might even call the Energy Secretary ... Chris Wrong.
I resent, as a rule, any news story about a politician’s social media presence. The social media post is simultaneously the lowest form of political communication and, for the journalist, the lowest hanging fruit. It is too easy to sit at your laptop, read tweets, and then write about them.
But I speak for hundreds of engineers, policy wonks, and hangers-on across the world of energy and climate when I ask: What the heck is happening with Chris Wright’s Twitter account?
Chris Wright is the current Secretary of Energy; before his appointment, he was the chief executive officer of Liberty Energy, the country’s second largest fracking company. He has been by far the most publicity-seeking member of President Trump’s energy policy team. He has helped oversee the president’s somewhat contradictory goals of seeking to reduce energy costs for Americans, support domestic fossil fuel companies, get OPEC to drill more, export as much natural gas as possible, and block the construction of new large-scale transmission lines and wind farms.
His substantive policy work is the focus of many other articles on Heatmap. For now, I want to focus on his and his department’s unpredictably confused political communications.
It began with the Department of Energy on the social network X. Several weeks ago, I started to conclude that the official agency account must have at least two authors. One of these people is familiar with how federal agencies usually speak — even if they add a small Trumpian flourish:
The other enjoys capitalizing verbs and has only a vague grasp of economic history:
One could nitpick here — “planes,” in the mid-1800s? — but there is no need to do so. As time has gone on, the official Energy Department account has begun to make more meaningful errors.
On Monday, for instance, the official DOE account proclaimed: “6 gigawatts of AMERICAN NUCLEAR ENERGY added to our grid!”
Six gigawatts of new nuclear energy is a lot. It took 11 years to build two new nuclear reactors at Plant Vogtle in Georgia, and that project added only 2.2 gigawatts. But the U.S. did not really add 6 gigawatts. In reality, the Tennessee Valley Authority had signed a confidential memo to eventually develop up to 6 gigawatts of modular nuclear reactor capacity. The memo contained no project timeline or financial terms. These 6 gigawatts remain, in other words, largely hypothetical.
As X users will know, some especially erroneous posts now get a “community note,” a community correction of sorts containing “important context” or an outright fact check written by other users. These notes are supposed to contain a link to an authoritative source. The Energy Department “6 gigawatts” tweet is the first post I’ve ever seen to get a community note linking to a news story also linked to in the post itself.
But this is not the end of the foolishness. Take this claim, from last week:
This is just not a very sophisticated thing to say. It is true that wind and solar pose a distinct reliability challenge for power grids, and that grid engineers have expended time and effort thinking about how to manage that challenge. It is even true that advocates sometimes downplay these challenges. But it is not true that these technologies — or the power they generate — are “essentially worthless.” Grid-scale batteries, for instance, exist; they can store energy during the day and then release it onto the grid at times of peak demand. Transmission lines — like the sizable Grain Belt Express project, which was due to receive a federal loan guarantee until Wright canceled the funding — can also help manage these resources.
But perhaps such errors are forgivable when they come from an official account. What’s odd is that the secretary’s own account has made even stranger errors:
I had to reread this post several times to make sure I understood it correctly. Even then, I didn’t believe I had the right interpretation until the internet energy pundit Alex Epstein clarified it.
At first, I thought Wright was making some technical argument about how solar panels will never be able to meet total global energy demand. This would not have been true, but at least it would have been sort of interesting. No, per Epstein, what Wright was trying to communicate is that if you coated the world in solar panels, you would only produce electricity. And since electricity makes up 20% of the world’s total energy use today, “you would” — as Wright says “only be producing 20% of global energy.”
Never mind that if you did cover the world with solar panels (which would, to be clear, be a very bad idea), you would in fact produce vastly more energy than the global economy consumes today. Never mind that if you even covered half or a quarter of the world with solar panels (still a bad idea), you would obviously shift the economics of electricity — so that you could then, for instance, use the excess power to synthesize liquid fuel replacements for use in cars, ships, planes, etc. Never mind that, by one estimate, a single solar farm the size of New Mexico would meet the world’s electricity demand. (Building this would also be a bad idea, but not nearly as bad as the others.)
No, Wright is not saying any of that. What Wright is saying is the far more inane thought that solar panels only generate electricity, and the global economy does not only run on electricity. Thank you for that insight, Mr. Secretary.
Perhaps Wright does not know much about renewables; he was, after all, a fracking executive until recently. But his account is also curiously mistaken about fossil fuels:
This tweet is somehow wrong twice — it understates our own accomplishments. The United States is already the world’s powerhouse of natural gas. It has held that position since the first Obama administration, when it surpassed Russia to become the leading producer of natural gas globally. It became the world’s largest exporter of liquified natural gas in 2023.
Natural gas, however, is not the world’s fastest growing source of energy; it is merely the fastest growing source of fossil fuel energy. The fastest growing energy source — of any kind — is solar photovoltaics. Solar generation grew by an astounding 30% from 2023 to 2024, according to the International Energy Agency. By a slightly different metric, renewables (which include wind) grew by 6% last year, while natural gas grew by 2.7%, per the IEA.
It is worth reading some of the replies to Wright’s solar tweet; what you see are plenty of Trump-friendly (or at least Trump-agnostic) accounts raising their eyebrows at his clownishness. Fossil nerds, based tech bros, even AI experts are raising their eyebrows and asking: Surely the Energy Secretary couldn’t be this, well, ignorant?
I can’t claim to know what’s happening in Wright’s mind. But I do know what’s happening with his policy — and this weak messaging, in my view, points to the intractability of Wright’s position. On the one hand, Wright leads the Trump administration’s energy policy, and that policy is now dominated by a culture war against any type of electricity generation that doesn’t, in some way, “own the libs” — meaning coal, natural gas, and nuclear. The government has arbitrarily halted offshore wind construction, blocked hundreds of millions in funding, and yanked approvals away from nearly complete projects. Even if Wright believes that offshore wind is ill-advised, this kind of interference with businesses and contracts is even more costly — it is not how someone acts when he is focused on energy affordability above all.
On the other hand, Wright represents that quadrant of the modern Republican Party that remains focused (however feebly) on technological development and economic growth. This cohort champions artificial intelligence and American re-industrialization; they want an abundance of cheap energy; they fear a rising China. They are also alert and informed enough to realize that China must be doing something right — otherwise it wouldn’t be industrializing so quickly — and that a country that can add 256 gigawatts of electricity in six months without breaking a sweat will probably find some useful way to use it.
Between these two poles, Wright must scurry. So he insists that the Trump administration is working to add as much electricity capacity as possible for AI, and brags that AI turns electricity into intelligence, then qualifies that only some types of electricity generation are good for AI:
He says that AI “is going to massively empower the human mind” and transform the economy, but adds implicitly that this can only come under certain conditions, which don’t involve power lines that irritate farmers, wind farms that trouble the president, or the fastest-growing new source of power on the planet. He calls AI “the Manhattan Project of our time” and says that therefore the government needs to get out of the way.
It is an act that has worked, up to a point, so far. But Wright’s public performance of his complicated role can only go on for so long. Everyone who enters the Trump administration imagines that they will do so with their public image and integrity intact. Not everyone can pull it off.
The company, Nuclearn, aims to speed development and licensing processes with the help of a specially trained large language model.
You’d be hard-pressed to dream up a buzzier clean tech concept than an AI platform custom-designed for the nuclear industry. Yet Phoenix-based startup Nuclearn has been betting on the role of artificial intelligence in the booming nuclear sector since 2021 — predating the wide launch of ChatGPT and the Trump administration’s recent embrace of nuclear energy.
Now the funds are rolling in. The company announced today that it raised a $10.5 million Series A round led by the climate tech venture fund Blue Bear Capital. With this cash, Nuclearn plans to expand its repertoire of AI offerings, which spans everything from identifying and documenting faults in a reactor to project scheduling, engineering evaluations, and licensing and permitting for new or modified reactors.
To expedite these processes, the company has developed its own, nuclear-specific language model, built atop existing open source models and trained on public data from the Nuclear Regulatory Commission and other government agencies, Nuclearn’s cofounder and CFO, Jerrold Vincent, told me. This allows the model to pick up on “a lot of nuclear specifics, whether it’s the acronyms, vernacular, specific processes, even just sometimes the way [the nuclear industry] thinks about certain types of issues and the level of scrutiny they put on one thing versus another,” he explained.
By way of example, Vincent told me that one of the startup’s current customers is working on a licensing application and wanted to conduct some background research to identify potential gaps or areas where the NRC might raise additional questions. Every other time the company has pre-checked an application like this, Vincent said, it was a 400-hour process. Nuclearn helped reduce that timeline to less than a day.
It’s a deeply resonant win for Vincent and his cofounder, Bradley Fox, who are all too familiar with the inefficiencies of the industry themselves. Prior to founding Nuclearn, both worked in data science at the Palo Verde Nuclear Generating Station in Arizona, where employees spent thousands of hours every year on “a lot of documentation, a lot of paperwork, a lot of manual work,” Vincent told me.
Natural language processing had some very obvious applications for the nuclear industry. “Everything in nuclear is text. Everything’s written down,” Vincent said. So when some of the seminal research on novel deep learning models started coming out in 2017 and 2018, Vincent and Fox took note, exploring ways they could apply this to their own work. “Those were trends we jumped on very, very early, not because they were particularly fashionable at the time or because there was a lot of hype around it, but because that was the type of techniques we needed to be able to solve these problems,” Vincent told me. “That’s why we got into the language model space half a decade before ChatGPT.”
For the majority of jobs, such as working on permitting or license renewals, Nuclearn uses a software layer on top of its language model to coordinate various AI agents working on tasks linked to different data sets, such as analyzing design functions, safety protocols, or systems degradation over time. The software then integrates these various outputs to generate reports or summary analyses. On the operational side, the company has its own benchmarks to evaluate how its AI tools are performing on nuclear-specific tasks.
There is, of course, a certain poetic irony to the fact that AI is being used to license and manage operations for the very reactors that are now in such high demand for their ability to consistently and cleanly power AI data centers. The better AI gets, the more we need nuclear; the more we need nuclear, the more useful AI-powered tools like Nuclearn become.
To date, the company has integrated its AI platform into the operations of more than 65 reactors both domestically and abroad, which Vincent told me represents a mix of standard commercial reactors and small modular reactors. As the market heats up, demand may well follow. With the Trump administration pushing to accelerate nuclear development, electricity demand rising, and tech giants prioritizing clean, firm power, it’s boom times for companies looking to build everything from conventional nuclear plants to small modular reactors, microreactors, and the long-elusive fusion reactor, each and every one of which will have to be licensed and permitted.
All this activity also means that the nuclear workforce is under strain, especially given that 25% set to retire in the coming decade. “We’ve had knowledge and workforce challenges for several years now, and now it’s getting exacerbated quite substantially from all the macro trends going on,” Vincent told me. Given this situation, he doesn’t anticipate that the adoption of AI tools will necessarily lead to layoffs. These days, he said, the industry is just wondering “how do we do the things we need to do to operate a nuclear power plant safely and efficiently with less people?”
With this new capital, the startup plans to scale its operations to encompass even more aspects of nuclear reactor management. One future use case Vincent anticipates is helping to automate the sourcing of unique, industry-specific parts. There are plants operating today, he told me, that rely on equipment from vendors that may be long out of business. Figuring out how and where to source equivalent components is the type of niche challenge he’s excited to take on.
“It just tends to be very manual, labor intensive, and very documentation heavy,” Vincent told me of the industry as a whole. Luckily, “those are all things that AI is very good at solving these days.”
Editor’s note: This story has been updated to note some poetic irony.
On Tesla’s losses, Google’s storage push, and trans-Atlantic atomic consensus
Current conditions: Hurricane Kiko is soaking Hawaii and slashing the archipelago with giant waves • Nearly a foot of rain is forecast to fall on parts of Texas, risking flash floods • Dry, windy weather across broad swaths of South Africa is bringing “extremely high” fire risk.
China's clean-energy investments are paying green dividends. Ember
China’s clean energy boom is bringing a global decline in fossil fuel demand into sight amid declines in usage in the buildings, vehicles, and industries of the world’s second-largest economy, according to the think tank Ember’s latest China Energy Transition Review. The report, released Tuesday morning, found that exports of solar panels, batteries, electric vehicles, and heat pumps are soaring, particularly to emerging economies, making the possibility of developing nations making possible an “energy leapfrog” over the coal phase of growth. From 2015 to 2023, China’s end consumption of fossil fuels fell 1.7% across buildings, industry and transport, while electricity use as a replacement rose by 65%. In power generation, fossil output dropped 2% in the first half of 2025 compared to the same period last year, as wind and solar generation soared by 16% and 43%, respectively. Last year alone, Beijing invested $625 billion in clean energy, 31% of the global total.
“China is now the main engine of the global clean energy transition,” Muyi Yang, coordinating lead author of Ember’s 2025 analysis, said in a statement. “Policy and investment decisions made in China over the last two decades are fundamentally changing the basis of China’s own energy system, and enabling other countries to also move swiftly from fossil to clean.”
As Americans scramble to buy electric vehicles ahead of the expiration of the $7,500 consumer tax credit at the end of this month, fewer of those cars are Teslas. The preliminary August data Cox Automotive released on Monday showed the best month for EVs in U.S. history was the worst for Tesla ever recorded. EVs climbed to almost 10% of total car sales last month, but Tesla’s share fell to 38%, with 55,000 cars sold all month. That’s up just 3% compared to July and down 6% from the year prior, while the company’s total market share fell from just over 40% in July and 45% in the first half of the year. By contrast, Heatmap’s Matthew Zeitlin noted, Tesla commanded about 80% of U.S. EV sales in 2020.
Also on Tuesday, the company unveiled two new energy storage products that could boost its utility division. At the RE+ conference in Las Vegas, Tesla presented the Megapack 3, the latest generation of its utility-scale battery system, and the Megablock, which integrates the Megapack 3 with transformers and switchgear. Batteries were Tesla’s fastest growing business in the first quarter of this year, as Matthew reported in April, but the company feared that tariffs would affect the business. “The energy segment — which includes the company’s battery energy storage businesses for residences (Powerwall) and for utility-scale generation (Megapack) — has recently been a bright spot for the company, even as its car sales have leveled off and declined.”
Google inked a deal with the Salt River Project, the utility serving much of Arizona’s largest metropolis, to test the performance of long-duration energy storage projects. The first-of-a-kind research collaboration aims to “better understand the real-world performance of emerging non-lithium ion long duration energy storage technologies” in the Phoenix area, the power company said in a press release. Google will fund a portion of the costs and evaluate data on the pilot projects’ operational success. “We believe that long duration energy storage will play an essential role in meeting SRP’s sustainability goals and ensuring grid reliability,” Chico Hunter, the nonprofit Salt River Project’s manager of innovation and development, said in a statement.
As I reported in this newsletter in July, Google also backed the Italian carbon dioxide-based storage startup Energy Dome as the tech giant pushes to expand its portfolio of technologies to power its data centers 24/7.
The European Union has been a solid backer of fusion energy research. But the anti-nuclear trifecta of Germany, Austria, and Luxembourg has long thwarted bloc-wide efforts to bolster fission, which provides the bulk of the continent’s electricity. With Berlin finally joining Paris in backing traditional nuclear power, that blockade is no longer holding. The European Commission has proposed spending $11.5 billion on bolstering research in both fusion and fission, the trade publication NucNet reported Monday.
Meanwhile in the United States, where nuclear power remains broadly supported across the political spectrum, the biggest question is how quickly new reactors can come online. The data center industry has now called on the Nuclear Regulatory Commission to streamline licensing of new reactors to help meet its surging demand for electricity. In a letter to NRC Chair David Wright shared with E&E News, the Data Center Coalition, a trade group representing server farms, urged the agency to update its regulations to ensure quicker deployment of advanced reactors. “Increasingly, DCC members are forming strategic partnerships and committing to offtake agreements with utilities and nuclear technology developers, injecting new momentum into this strategic sector,” wrote Cy McNeill, the group’s director of federal affairs. “We are approaching the cusp of a truly revitalized nuclear sector.”
The push comes amid what Heatmap’s Katie Brigham called a “nuclear power dealmaking boom.”
Patagonia’s billionaire founder helped popularize the greenest trend in apparel — buying less of higher quality, longer-lasting clothing. Now the retailer is pushing to bring that same ethos to the food business. The company’s edible offerings of tinned fish and crackers designed for hiking is now expanding into baby foods, oils, and sauces, The New York Times reported in a new profile of the retailer. Fifty years from now, founder Yvon Chouinard told the newsletter, “I could see the food business being bigger than the apparel business.”