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On the California waiver, an SMR, and CATL

Current conditions: Burbank, California, may hit 95 degrees Fahrenheit today, matching or potentially breaking the 1988 daily record • An area of low pressure could bring snow to the mountains in South Africa • Heavy rain is expected in Washington, D.C., where House Speaker Mike Johnson — perhaps wishfully — aims to hold a floor vote on the reconciliation bill today.

Senate Republicans plan to vote this week on California’s ability to set its own emissions standards, Majority Leader John Thune said on the Senate floor Tuesday. Since 1967, the Environmental Protection Agency has granted California a waiver to set stricter-than-federal restrictions on emissions in acknowledgment of the state’s unique air pollution challenges, including smog; due to the state’s size, however, those standards have largely been adhered to by automakers nationally. The House voted earlier this month to end California’s waiver — which has long been opposed by Republicans, who’ve called it, erroneously, an “electric vehicle mandate” — although there had been some uncertainty over whether the Senate would take up the vote, since Senate parliamentarian Elizabeth MacDonough and the Government Accountability Office had both ruled that the EPA waiver is not subject to the Congressional Review Act, which is what Republicans have called upon to attempt to overturn it.
Thune confirmed that the chamber would take up the three House resolutions unwinding the California waiver, claiming Democrats were “attempting to derail a repeal by throwing a tantrum over a supposed procedural problem.” In response, Senator Alex Padilla of California, a Democrat, said, “If this attempt is successful, the consequences will be far-reaching, not only for our clean energy economy, the air our children breathe, and for our climate, but for the future of the CRA and for the Senate as an institution.”
The Tennessee Valley Authority is seeking a permit to build a small modular reactor, the Journal-News reports, the first utility to do so. On Tuesday, the TVA — the nation’s largest public power provider — took another step toward adding an SMR to its nuclear fleet by applying for a construction permit from the Nuclear Regulatory Commission to build a site on Tennessee’s Clinch River.
While the project had previously been touted by the Biden administration as helping advance the nation toward “a clean energy future,” my colleague Matthew Zeitlin noted that language has vanished from the construction application, which now argues the SMR is the next step in “establishing America’s energy dominance to power artificial intelligence, quantum computing, and advanced manufacturing.” Regardless of spin, the fastest Clinch River could go into operation is about five years, Adam Stein, the director of the nuclear energy innovation program of the Breakthrough Institute, told Matthew.
The world’s biggest manufacturer of electric vehicle batteries, CATL, raised $4.6 billion in its debut on the Hong Kong Stock Exchange Tuesday, making it the largest share offering of 2025 to date. The stock surged 16% over the subscription price, although onshore U.S. investors were largely shut out by the company in order to “limit its exposure to U.S. legal liability,” with the Pentagon having put the Fujian province-based company on a blacklist earlier this year for its alleged links to China’s military, Bloomberg writes.
CATL’s manufacturing is done almost entirely within China, although the company has said it will use 90% of its proceeds from the Hong Kong offering on the construction of a new factory in Hungary, The Economist reports. Though the company faces an uphill battle making inroads in the U.S. due to slowing demand for electric vehicles and scrutiny of Chinese companies by American politicians, The Economist adds that CATL also has “plenty of room for further expansion,” including growing its “higher-margin energy-storage business.”
Japanese automaker Honda announced Tuesday that it will pivot away from its investment in electric vehicles in order to focus on growing demand for hybrids, Reuters reports. The company revised its electrification investment from about $69 billion to $48 billion, while at the same time planning 13 hybrid models between 2027 and 2031.
Honda cited a slowdown in EV sales as justification for its decision, though as Electrek points out, “It’s estimated that this year – not 2030 – 25% of cars sold globally will be EVs,” and that “any company that sells less than that is lagging behind the curve, losing ground to companies that are ready for the transition that is already happening.” Electrek adds that Honda’s profits have largely slipped due to competition in the Chinese auto market from domestic EVs.
If the world merely sustains the current level of warming, at 1.2 degrees Celsius above pre-industrial levels, ice melt off of Greenland and Antarctica could still “profoundly alter coastlines around the world, displacing hundreds of millions of people, and causing loss and damage well beyond the limits of adaptation,” a grim new study published in Nature has found. Even keeping global temperature rise beneath the 1.5 degrees Celsius threshold established in the Paris Climate Agreement could result in “catastrophic inland migration and forced migration,” the University of Bristol’s Jonathan Bamber, one of the authors of the report, told The Guardian. In fact, “you don’t slow sea level rise at 1.5,” lead author Chris Stokes of Durham University told CNN. Rather, “you see quite a rapid acceleration.”
Around 230 million people live less than a meter, or 3.2 feet, above sea level, including many residents of Miami. The researchers estimated that due to ice melt, seas could rise 40 inches by the end of the century, requiring “massive land migration on scales that we’ve never witnessed since modern civilization,” Bamber told CNN. As Stokes added, “There’s very little that we’re observing that gives us hope here.”

Ikea has begun selling air-to-water heat pumps in Germany, in partnership with Svea Solar. “Sustainable living should be accessible to the masses,” Jacqueline Polak of Ikea Germany said in a statement.
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The data center boom is everywhere you look in U.S. economic and emissions data.
This is an edition of Heatmap Daily, an evening review of the day’s news written by our executive editor. Sign up for it here.
It isn’t exactly a new thought, but I’ve been struck recently by how many trends in America’s economic and environmental data are fundamentally about the data center boom and the return of electricity demand:
First, the Energy Information Administration reported this week that U.S. emissions grew by more than 2% last year, driven by surging electricity demand and an increase in coal-fired generation. What caused that higher power demand? New factories and data centers — as well as record summertime cooling demand.
Second, many of the new factories driving that higher power demand are themselves producing goods that are … let’s say … data center-adjacent. There are the enormous new semiconductor fabs, of course. But Ford and General Motors have also set up new production lines (or repurposed old ones) to manufacture grid-scale batteries to meet power demand.
Third, take a look at the recent U.S. spending on private non-residential construction — in other words, everything American companies are building that is not houses, condos, or apartments.
The construction industry’s spent almost $60 billion on data centers over the past year, which is more than it spent on all other office buildings combined (and more than it spent building warehouses, too). Just a handful of categories — data centers, power plants, electricity infrastructure, and certain kinds of electronics manufacturing — now make up a third of all U.S. private non-residential construction investment. They’ve never made up such a large share of construction spending since data collection began in 2014.
As The New York Times recently noted, the American economy is unusually dependent on the American stock market right now — and the stock market is unusually dependent on artificial intelligence. This week, investors started to balk at the enormous spending hyperscalers are planning to keep building out the AI boom; Alphabet’s shares dropped 8% this week after it boosted its planned 2026 capital expenditure and signaled 2027 will be even bigger. If the data center boom started to slow down in earnest, then more than just that budget will change.
Speaking of which, my colleague Emily Pontecorvo wrote earlier this week about how many businesses are struggling to even estimate their carbon emissions from artificial intelligence. The carbon accounting startup Watershed recently unveiled a new formula to help companies get a sense of their AI-related emissions.
But even that formula is still limited by the amount of data hyperscalers publish — and they don’t publish that much. Google, for instance, is the only AI company that has (laudably) provided estimates of its emissions on a per-prompt basis. Yet no company has published its per-token emissions, or how emissions sync up with particular models or regions.
So Emily asked Google: Why aren’t you — or any other model provider — disclosing this kind of data yet?
The tech company didn’t get back to us until after we’d published Emily’s story. But its response was interesting enough that I wanted to quote some of it here.
The problem is “industry consensus,” Cooper Elsworth, a Google spokesperson, told us. “There is currently very little consensus on how to comprehensively and fairly measure the serving environmental impact of generative AI (such as text generation),” he wrote. “Without standardized, ‘apples-to-apples’ frameworks, it is difficult to compare different providers accurately.”
That’s partly because energy use — and emissions data — can vary from site to site and depend on “custom-built hardware, software compilers, and advanced inference techniques.” And he claimed Google doesn’t always have the measurement hardware in place to provide such specific estimates: “Providing precise, repeatable data requires highly advanced measurement infrastructure,” he said. “For example, software-based energy monitoring tools often suffer from sampling biases. For our study, we had to step away from top-down averages and directly measure actual energy at the physical power supply unit (PSU) level across our deployed fleet. Not all providers have the telemetry or data sets required to benchmark their operations at this level of granularity.”
Read Emily’s story to understand the other reasons why estimating — or even “guesstimating” — AI-related carbon emissions is so challenging.
A conversation with Emma Uridge of the Kansas Health Institute.
This week’s conversation is with Emma Uridge, analyst with the Kansas Health Institute. Uridge spent copious hours analyzing state and local laws on data center development to best understand how policymakers are responding to the potential environmental public health impacts of large AI infrastructure, including power and water. The report, which came out this week, also goes in depth into those health impacts. I reached out to her to discuss what she sees as must-watch territory for our readers on this emerging policy arena.
Our conversation was lightly edited for clarity.
What is actually being done on policy when it comes to data centers — beyond moratoria of course?
So first I’d like to just talk about the point of moratoria. It’s helpful to talk about how these policies emerge in the first place. One area where moratoria are helpful is when a data center is proposed but the county has no approach for how they’d like to potentially regulate them. That’s temporary, most of the time. It lets local governments conduct research on the various impacts and also negotiate community benefits, ones that can mitigate any potential negative impacts — like Lancaster Pennsylvania, which instituted a community benefit agreement that maximized the potential benefits of development while mitigating what large data centers can do. That agreement looked at capping municipal water use at 20,000 gallons per day and requiring 100% clean energy. It had financial penalties for non-compliance. The company also committed $20 million to their local economic development and clean energy fund. There are ways to negotiate with developers.
We also see amendments to existing zoning. Data center proposals are increasingly popping up in rural areas, many of which are unzoned, so there’s no way a county can negotiate unless there’s a moratorium in place.
Other policy solutions include different performance standards or requiring on-site renewable energy, like what Jefferson County, Missouri, looked at. Also setback requirements, mandatory noise buffers, ending by-right zoning.
Where are local governments getting ideas for regulating data centers?
A lot of the technical information comes from developers. That can in cases be seen as a biased source of information. I wouldn’t say there’s a dedicated group providing assistance to local governments when a project is proposed — which is a similar story to wind industry development, where we have only a handful of consultants who provide technical advice. It can be really helpful to get a multi-disciplinary approach to hearing information. It can be helpful to have the utility commission, public health folks, those in academia, as well as the developer.
As of right now, especially in rural areas, local governments have a hard task of balancing pushback while getting the most accurate, evidence-based, neutral information to make decisions. That balance can be contentious.
What is the federal government doing on data center policy? How is the Trump administration approaching it?
A few things there. In the early days, the drive was for AI expansion and to be competitive with foreign adversaries. Now due to the amount of public pushback in red and blue localities and a more cautious approach.
I’m not seeing a lot of actual policy movement at this time.
I know the EPA is looking at the chemicals used in cooling data centers because when that water is cycled through the system, some of it is discharged into the water system, so they’re looking at the Toxic Substances and Control Act for monitoring that.
How much of an impact does this minimal federal role have on industry behavior?
Y’know, this isn’t specific to data centers. This is true for all kinds of large-scale development: there’s a need to require some sort of federal monitoring and regulation.
That’s where I see an emerging role for public health. At the federal level, there could be policy movement towards requiring some sort of environmental monitoring at data centers to make sure they’re operating responsibility. Looking at specific water use relative to water availability and what happens when there’s a time of severe, persistent drought. With air quality too — we’ve seen areas where the grid isn’t as reliable so their diesel generators are kicking on more and affecting air quality for residents.
We’re just not seeing all of that right now. We need corporate disclosure.
What do you see as the most important public health impacts from data center development?
It varies by localities. The most discussed obviously is water usage. One thing I’d note about my conversations with folks enthusiastic around emerging tech is, there are still questions that need to be asked about the capacity of localities to support a data center. Like a small town in Kansas may only be using 40% of their water for their utility needs. If a data center came online, how much of that water goes to the data center?
One area underexplored within the public health discipline is energy poverty and energy security. The ability of a household to meet the needs of everything energy provides in our lives. It’s known we have an aging electric grid but we’re not talking enough about large-scale blackouts when the grid is not sufficient to support some of these new data centers.
Plus more of the week’s big development fights.
1. Laramie County, Wyoming — Meta is fighting the fine it received in the Cheyenne data center water pollution controversy, and the conflict between the tech giant and the city’s small board of public utilities is continuing to spill out into the public.
2. Niagara County, New York — This county just rejected a solar project’s highway work permits in a show of retaliation against the state’s Office of Renewable Energy Siting.
3. Barron County, Wisconsin — The anti-solar protest is the new campaign stop in deep red Wisconsin.
4. Chesapeake, Virginia — A large battery storage project on the Virginia coastline is on the rocks amidst rampant local opposition.
5. Lewis County, West Virginia — West Virginia is now a key battleground in the fight over transmission, as a line spanning all of West Virginia and Maryland — and cutting through Data Center Alley in Virginia — causes compounding consternation.