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Artificial intelligence wants the energy and has the money, and climate tech companies need buyers.
Their founders wanted to make transmission lines, powertrains, and electrical switches more efficient. Or maybe they wanted to unlock the potential of geothermal energy or low-carbon cement. Wherever they began, a bevy of deep tech climate startups, clean energy producers, and sustainable materials companies have found their way to the same destination: Building and powering data centers in the most energy efficient way possible.
“They might not have started out as data center companies, but they’ve been pulled — because of this huge market movement towards data centers — into being that,” Lee Larson, an investor at the venture firm Piva Capital, told me.
With power demand from artificial intelligence on track to grow as much as 30x from 2024 to 2035, and the Trump administration seeking to fast track data center buildout, there’s a wealth of opportunity — and literal cash — for startups that can help hyperscalers meet their clean energy targets while cramming as many high-powered computing chips into a data center as physically possible.
“I think the proportion of pitches that we see that reflects some kind of data center messaging has gone from maybe one out of 20 to one out of five,” Matthew Nordan, co-founder and general partner at Azolla Ventures told me. “It’s a lot.”
Perhaps the most obvious data center pitch is for companies offering clean, firm power or energy storage. In Azolla Ventures’ portfolio, that includes the geothermal exploration and development company Zanskar and the underground pumped hydro storage company Quidnet. While neither has announced any data center tie ups to date, both are having conversations with all the usual suspects — a group that includes Google, Microsoft, Amazon, and Meta. “Virtually any reasonably mature, ready to deploy clean, firm power technology company is talking to the same people,” Nordan told me.
Some big deals have already made headlines, especially in the nuclear and geothermal sectors. There’s Microsoft’s plan to reopen the Three Mile Island nuclear plant and Google’s deal with the small modular reactor startup Kairos, plus Fervo’s partnership with Google and Sage Geosystems’ partnership with Meta on the geothermal side. But fusion companies also see data centers as a viable option. Google already has an offtake agreement with Commonwealth Fusion Systems, while Microsoft has a deal with Helion Energy.
But it’s not just the big name cleantech companies that are turning into data center service providers. The AI boom also presents a major opportunity for deep tech startups working on electrical infrastructure. While companies in this sector might not scream “climate tech,” behind the curtain they’re driving significant gains in energy efficiency that data center operators are eager to tap into.
In Azolla’s portfolio, these include Scalvy, founded to build modular powertrain electronics for electric vehicles. The company’s small, distributed units connect directly to EV battery cells, converting DC power from the batteries into AC power for the motor. “The hyperscalers started coming to the company saying, can you do what you’ve done in reverse?” Nordan told me. “Can you take the AC coming in off the grid and then convert that to DC, and then interface with the load and energy storage systems?”
That proved easy, and now Scalvy’s small, building-block style approach allows data centers to control power flow on the server rack itself, as opposed to taking up valuable space with a separate power rack. While the details haven’t yet been announced, Nordan said the startup “has recently done their first agreement for data center power, and it’s with one of the large names that you would expect.”
Piva Capital has also invested in a number of under-the-radar companies in this arena — Veir, for instance, initially proposed to build “high-temperature superconducting transmission lines” that could carry electricity with near-zero resistance, and thus very low energy loss. But after seeing some early interest from data centers, the startup learned that hyperscalers were not only struggling to build transmission lines to their substations, but were also experiencing severe bottlenecks in their low-voltage distribution networks, responsible for getting power into and around data centers.
“We realized we can apply essentially the same superconducting technology that we’re targeting for transmission and distribution applications and build a low-voltage set of products for data centers, specifically, that can allow you to shrink the size and weight of conductors and bus bars [which distribute power within data centers] by 10 times,” Veir’s CEO Tim Heidel told me. With this newly refined focus, the company raised an oversubscribed $75 million Series B round in January, which included participation from Microsoft’s Climate Innovation Fund.
Piva is also an investor in Menlo Micro, a spinout from General Electric that uses a proprietary metal alloy to make high-performance electrical switches that are smaller, faster, and more energy efficient than the industry standard. The startup has already commercialized its tech for use in high-speed radio frequency devices, as well as for testing the performance of semiconductors.
Ultimately, the company is aiming to integrate its switches into a wide range of high-performance electrical equipment, data center power systems very much included. In this context, the startup’s switches could be embedded directly into semiconductor packages or circuit boards rather than installed on racks, leading to more compact and energy efficient data center power management. The switches’ small size and low resistance would also generate less heat than what’s used today, further increasing overall energy efficiency.
Menlo Micro’s CEO Russ Garcia told me that five years down the line, he expects a third of the company’s revenue to come from power applications such as data centers, growing to two-thirds in 10 years’ time.
Even sustainable materials companies are getting pulled in, Nordan told me. The primary example there is Sublime Systems, which inked a purchase agreement with Microsoft for up to 622,500 metric tons of low-carbon cement. The deal gives Microsoft the right to use the cement if and when it's useful, but more importantly, it entitles the tech giant to the cement's environmental attributes — that is, the carbon savings associated with producing it. The idea is that the tech giant can catalyze market demand without the emissions impact of shipping the cement to its data center sites.
Amazon has also invested in a number of companies in this sector, including Brimstone and CarbonCure, which are working to decarbonize cement and concrete, as well as Electra, which is working on green steel. The hyperscaler is also trialing products from Paebbl, which produces a carbon-negative mineral powder that can partially replace cement, on the construction of an Amazon Web Services data center in Europe.
While the current administration may not be exerting pressure on hyperscalers to reduce their emissions, Nordan told me that the tech giants are thinking about the long term. “If the tide turns and there will be real or effective costs to emissions in these data centers, they want to do everything they can to bankroll emissions reductions now. And that manifests itself in low-carbon cement, in green steel, in all sorts of technologies.”
At least some of the aforementioned investments — especially those that increase efficiency while decreasing the size of data center components — won’t necessarily lead to emissions reductions, however. Much as when the Chinese AI firm DeepSeek released its cheaper and more efficient AI model, the idea of Jevon’s Paradox looms large here. This is the theory that making products more efficient and cost-effective will lead to an overall increase in consumption that more than offsets the efficiency gains.
Heidel, for one, told me that Veir’s potential customers don’t see energy efficiency in itself as the startup’s main draw. “It’s actually the space savings, the real estate savings, the ability to lay out data centers and configure them in new ways,” he told me. Mainly what Heidel is focusing on with his customers-to-be is, “how much smaller can you make the building, or how many additional AI pods or servers could you fit into the same footprint, or how much higher of a server density could you achieve using our solution?”
Of course, one day Veir may fulfill its original dream of creating superior transmission infrastructure, just as Scalvy could circle back to its initial focus on EV drivetrains and Menlo Micro could wriggle its way into a whole host of electronic devices.
As Heidel told me, he sees this data center buildout as just the first push in what will be an ongoing effort to meet the world’s growing electricity demand. “If we can figure out how to serve all of this demand at the speed at which data centers are growing, and do so cost effectively, and do so in a low-carbon way, then we can take those learnings and apply them to all of the other industries that are coming in the future that'll also be facing enormous electricity demand,” he explained.
But for the time being, as Larson of Piva Capital told me, investors are simply trying to get their portfolio companies “to skate where the puck is going.” And that’s more than okay for Heidel. As he put it, there’s “so much enthusiasm for data centers today that we are having trouble just keeping up with all the interest in that market.”
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In a Heatmap exclusive interview, CEO Alfred Johnson discusses the clean energy financing marketplace’s latest big move.
Crux is expanding again.
Until earlier this year, the clean energy finance startup was a digital marketplace exclusively for buying and selling tax credits unlocked by the Inflation Reduction Act. But in March, as Republicans in Congress briefly threatened to eliminate tax credit transferability, the company moved into debt financing, a market Crux CEO Alfred Johnson told me later on is more than seven times bigger.
Now, in its quest to become a one-stop shop for efficient project financing, Crux has told Heatmap that it’s growing once more into the tax and preferred equity markets, two additional funding avenues for clean energy projects that could certainly stand to be organized, standardized, and digitized as they grow in importance. “The tax equity market was a $20 billion market before the IRA, and is now a $32 billion to $35 billion market,” Johnson told me, citing numbers from the company’s forthcoming mid-year market intelligence report. That’s a 10% to 20% increase over last year.
Johnson said that Crux’s platform will ameliorate some of the complexity and high costs that have historically made tax equity financing so difficult to access. In these deals, clean energy developers partner with tax equity investors, typically banks, which provide them with cash in exchange for an equity stake in their project — and the associated tax benefits.
In one way, it’s a funny move for Crux. Before the IRA passed, tax equity was essentially the only way for project developers with low tax burdens to monetize their credits, and transferability itself was billed as a solution to these kludgy deals. But even though the transferable tax credit marketplace has proven to be a valuable option for many developers, there are reasons why some still prefer tax equity financing.
For one, tax equity partnerships can actually be the cheapest form of project financing for large developers overall. That’s in large part because tax equity is such a scarce but critical form of capital that if a developer can secure it, they can often then raise other forms of funding, such as bridge loans, more easily. Tax equity deals also serve to establish the fair market value of a project, which thus ensures that project developers can maximize the value of their tax benefits.
Lastly, Johnson explained that tax equity financing allows project developers to capture the value of a tax benefit known as “accelerated depreciation,” in which a large percent of a project’s asset costs can be deducted in the first few years of operation as opposed to evenly over the project’s useful life. Unlike with tax credit transferability, there’s no direct way for developers to monetize accelerated depreciation benefits other than via tax equity partnerships.
These types of partnerships will, in all likelihood, still only make sense for well-capitalized projects deploying proven technologies such as solar, wind, and storage. More novel tech such as advanced nuclear, long-duration storage, or next-generation geothermal will probably continue to rely primarily on the tax credit transfer market. But as Johnson told me, “for the developers that have really strong financials, have large projects, are able to secure tax equity, that is often preferred as a way of monetizing their credits to selling directly in the transfer market.”
At the same time, the markets for tax equity and credits are increasingly converging. That’s because it’s become more common for tax equity investors — or the partnership itself — to sell the credits they now hold into the transfer market, Johnson told me. This provides the investor or partnership with immediate liquidity, which can then be invested into other projects. This type of hybrid structure has thus far made up over 60% of tax equity commitments in 2025, according to the company’s mid-year market report.
Crux is also expanding into preferred equity, a type of financing that allows project developers to raise additional capital closer to the start of commercial operations. Then, once operation commences, preferred equity investors typically receive fixed, priority returns before any distributions are made to common equity holders. This structure reduces risks for preferred investors, giving them a more predictable income stream. It’s a smaller market than tax equity financing, but still an important piece of the puzzle, Johnson said.
And then there’s — what else? — artificial intelligence.
As developers and investors that have used Crux’s tax credit marketplace “graduate” into new, often more complex forms of project financing such as tax and preferred equity, Johnson told me there are “huge opportunities” to make these deals more efficient. As he sees it, this will involve integrating the company’s current workflow management and documentation tools with AI language models designed to streamline document organization and synthesis, along with other administrative processes. The idea is to save time “without any deterioration in the quality of the underwriting,” Johnson said.
These latest expansionary moves will be far from Crux’s last, Johnson told me. There’s all sorts of equity financing Crux could theoretically help to facilitate, along with transactions between equipment manufacturers and project developers or project developers and utilities.
It’s all on the table, Johnson said. “I think we will continue to find that this mix of liquidity, efficiency, and intelligence makes sense in lots of different categories.”
On PJM’s inflexible giants, another wind attack, and a Sino-Russia mega deal
Current conditions: In the Pacific, Tropical Storm Kiko has strengthened into a hurricane on its way toward Hawaii • Unusually cool air in the Upper Midwest and Appalachians could drop temperatures to as much as 20 degrees Fahrenheit below average • Nearly one million people are displaced in Pakistan’s most populous state as Punjab suffers the biggest flood in its history.
The Trump administration’s plan to kill a $20 billion clean energy financing program got the green light from a federal appeals court on Tuesday. The Greenhouse Gas Reduction Fund, housed under the Environmental Protection Agency, was designed to provide low-cost loans for solar installations, building efficiency upgrades, and other local efforts to reduce planet-heating emissions. The three-judge panel overturned a lower court’s injunction temporarily requiring the EPA to resume payments, ruling that most of the plaintiffs’ claims were contract disputes and belonged in the Court of Federal Claims. If the case now moves to that court, Heatmap’s Emily Pontecorvo wrote, “the plaintiffs would only be able to sue for damages and any possibility of reinstating the grants would be gone.”
Before leaving office, the Biden-era EPA finalized awards to eight nonprofits that would “create a national financing network for clean energy and climate solutions across the country.” The move was meant to insulate the program from cuts, but it stirred the new administration’s ire. The Trump EPA called the move a scam to give taxpayer-funded slush funds to nonprofits stacked with former Biden administration appointees. The recipients could still appeal the decision, which experts told Emily could still have significant ramifications. Watch this space.
The country’s largest electrical grid, the PJM Interconnection, put out a conceptual proposal in August for a plan to ask large electricity users such as data centers to voluntarily reduce their power consumption when there’s a shortage of electrons on the grid — and potentially require them to do so if too few step up. The plan is largely in line with what the Data Center Coalition, a trade association representing server companies, recently backed in a legal filing in North Carolina, as this newsletter previously reported. Yet big tech companies balked at the proposal, according to comments submitted in response. Microsoft warned that imposing curtailment undermines investor confidence. Amazon said targeting large power users to cut back on demand is discriminatory. Talen Energy, an independent power producer, said the 13-state-spanning PJM has no authority to make such a rule, and that individual state law governs load. The Data Center Coalition itself criticized the rule’s assumption that big power users have on-site back-up generation as overly broad and not reflective of reality.
The idea itself derives from an influential paper released by Duke University researchers in February that found the U.S. could add gigawatts’ worth of additional demand from new data centers without building out an equivalent amount of power plants if those facilities could curtail electricity usage when demand was particularly high. Heatmap’s Matthew Zeitlin described the strategy as “one weird trick for getting more data centers on the grid,” boiling down the approach simply as: “Just turn them off sometimes.”
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The Trump administration said it would reconsider the permit for SouthCoast Wind, a Massachusetts offshore wind farm approved last year by the Biden administration, according to legal filings seen by Reuters on Tuesday. In a motion filed to the U.S. District Court for the District of Columbia on Friday, lawyers at the Department of Justice said the Department of the Interior would review the project’s construction and operations plan.
The move came a week after Trump yanked back approvals for the nearly-complete Revolution Wind project off Rhode Island’s coast. It’s just the latest escalation in what Heatmap’s Jael Holzman called “Trump’s total war on wind.” As I reported yesterday in this newsletter, the Department of Transportation was the most recent agency to join the effort this week, axing $679 million in funding for infrastructure to support offshore wind development. But the Interior Department has led the charge with a witch hunt against policies that favor wind power, the de-designation of millions of acres of federal waters for offshore turbine construction, and a new investigation into bird deaths near windmills. The Department of Commerce tapped in last month by teeing up future tariffs with its own probe into whether imported turbine components pose a national security threat. The assault is prompting pushback. On Monday, the Democratic governors of five Northeastern states called on Trump to “uphold all offshore wind permits already granted.”
The BRICS brothers. Suo Takekuma - Pool/Getty Images
In spite of Trump administration pressure aimed at convincing countries around the world to reject Russian oil, the Kremlin netted an energy deal with the world’s second-most populous nation on Tuesday in a sign of what Russian President Vladimir Putin called an “unprecedentedly high level” of good relations between Moscow and Beijing. Under the new agreement, China will buy Russian gas through a new pipeline from Siberia. Once complete, the Power of Siberia 2 pipeline will carry 50 billion cubic meters of gas through Mongolia to northern China every year.
The deal came at the tail end of a summit in China between Putin, Chinese President Xi Jinping, and Indian Prime Minister Narendra Modi. The trio of hardline leaders, who represent the three biggest economies in the world, came together for a photo depicting a friendly three-way handshake widely interpreted as a show of unity and defiance against Washington’s attempts to impose its will through economic sanctions.
The Tennessee Valley Authority is broadening its effort to remake itself as the testing ground for new American small modular reactors. On Tuesday, the federally-owned utility announced plans to buy 6 gigawatts of reactors from NuScale Power, the first and only SMR developer whose design has won approval from the Nuclear Regulatory Commission. Shares of NuScale — which has struggled since the high-profile failure of what was supposed to be the nation’s debut SMR power plant in Utah two years ago — surged nearly 8%.
The TVA had already planned to build the first U.S. units of GE Vernova-Hitachi Nuclear Energy’s 300-megawatt reactors, and last month became the country’s first utility to sign a power purchase agreement with a fourth-generation reactor developer, the Google-backed Kairos Power. The deals come amid what Heatmap’s Katie Brigham called a “nuclear power dealmaking boom.” On Tuesday an industrial standard-setting group that includes Exxon Mobil, Chevron, Shell, Rio Tinto, and IBM launched a new consortium to streamline processes around building advanced nuclear reactors. On Wednesday, Kairos inked a deal with nuclear fuel producer BWXT to work together on producing the rare type of uranium fuel the reactor company needs for its plants.
Wind turbines are notoriously not always recyclable. But they are reusable. Just ask Jos de Krieger, the co-founder of a Dutch company called Blade Made that purchases used turbines and transforms them into sleek, minimalist tiny homes. “Everything in the built environment — everything that you see around you — has an end of life,” Krieger told CNN. “And we need solutions besides waste or landfill, incineration or something without value… Changing that perception is really something that has to happen in the eyes of everyone,” he added, calling for “processes that create stories, instead of waste.”
Rob talks to Peter Brannen, author of the new book The Story of CO2 Is the Story of Everything.
How did life first form on Earth? What does entropy have to do with the origins of mammalian life — or the creation of the modern economy? And what chemical process do people, insects, Volkswagens, and coal power plants all share?
On this week’s episode of Shift Key, Rob chats with Peter Brannen, the author of a new history of the planet, The Story of CO2 Is the Story of Everything. The book weaves together a single narrative from the Big Bang to the Permian explosion to the oil-devouring economy of today by means of a single common thread: CO2, the same molecule now threatening our continued flourishing.
Brannen is a contributing writer at The Atlantic and the author of The Ends of the World, a history of mass extinctions on Earth. He is an affiliate at the Institute of Arctic and Alpine Research at the University of Colorado, Boulder. 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.
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Here is an excerpt from our conversation:
Robinson Meyer: Why do we have a surplus of oxygen in the air in the first place? It was, for me, also something I did not understand at all before I read the book.
Peter Brannen: So there’s this common trope that two out of the next three breaths you have is from phytoplankton the ocean, or a quarter of it is from the Amazon alive today. And there’s a sense in which that’s true because oxygen and CO2 are being exchanged very quickly in the biosphere. But there is something like 800 times more oxygen in the air than can be produced by the entire biosphere. And all of the oxygen that’s produced by the rainforest, say — the rainforest is a living system where everything else is consuming that organic matter and feeding off of it. And it’s kind of a wash — just as much oxygen is created by the trees as is consumed by the bugs and fungi and jaguars and all the things that are living in the rainforest that are feeding off those plants and respiring that plant matter back to things like CO2 and water. So on a net scale it’s a wash.
So that gets you a planet with close to zero oxygen, and instead we have this absurd abundance of this thing that wants to react with everything. And the only way you can do that is if, say, you imagine a tree and when it dies, rather than being decomposed by fungi and beetles and on and on, that tree suddenly gets buried in sediment and falls into the crust and becomes part of the rock record, and the oxygen it made in life is not used in its own destruction. And by shielding that tree in the earth, you leave this surplus of oxygen in the air. And over all of Earth history, as a vanishingly small amount of this organic matter, things like plants and algae, do make it into the rock record, they leave an equivalent gift of oxygen in the air as a surplus.
We are more familiar with plant matter in the crust where it’s economically exploitable — we call those fossil fuels. So in a weird way, the fact that me and you can breathe — I don’t think a lot of people attribute that to the fact that there’s fossil fuels in the ground. Luckily most, you know, quote-unquote fossil fuels are very diffuse in mudstones, and they’re not economically exploitable. And we’re never going to run out of oxygen by burning fossil fuels because, you know, we worry about CO2 going up in parts per million and oxygens in whole percent. So, you know, it is true that for every molecule of CO2 we burn we’re bringing down oxygen by an equivalent amount, it’s just not that concerning.
But yeah, there is this astounding way of reframing, of looking at the world where the plant surface is breathable only because of what’s happened in the rocks beneath it.
Mentioned:
Peter’s book, The Story of CO2 Is the Story of Everything
This episode of Shift Key is sponsored by …
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Music for Shift Key is by Adam Kromelow.