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When we talk about carbon removal, we often focus on “direct air capture” facilities — big factories that suck carbon dioxide out of the ambient air.
But a simpler and easier way to remove carbon from the atmosphere may exist. It’s called “enhanced rock weathering” — grinding up rocks, spreading them out, and exposing them to the ambient air — and it works, essentially, by speeding up the Earth’s carbon cycle. Enhanced rock weathering recently got a major vote of confidence from Frontier, a consortium of tech and finance companies who have teamed up to support new and experimental carbon removal technologies.
Frontier’s members include Stripe, Meta, Alphabet, Shopify, and McKinsey & Company. It aims to buy nearly $1 billion of various forms of carbon removal in the next few years — an intervention meant to spur commercial and investor interest in the sector.
In this episode, Jesse Jenkins, an energy systems expert and professor at Princeton University, and I talk with Jane Flegal, a former Biden White House climate adviser and now the market development and policy lead at Frontier, about the promise of enhanced rock weathering and why Frontier just spent $57 million to do it.
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:
Jane Flegal: So enhanced weathering is a carbon removal process that speeds up a natural process which is weathering of alkaline materials. And so weathering happens naturally, it actually drives what makes the earth habitable in the first place. It just happens over very, very long periods. So essentially what happens is that rocks slowly erode when they come into contact with acid rain essentially and —
Robinson Meyer: Naturally acidic rain?
Flegal: Yeah, not like acid rain the way we think of it, rain that is acidic because it has some dissolved CO2. And so that acidic rainwater interacts with rocks and erodes them, and it results in CO2 being stored either as a solid carbonate or as a bicarbonate. So that happens naturally, again, on very long time periods.
Meyer: And I just want to interrupt before we go any further. What then happens, right, is that the CO2 winds up being dissolved as a bicarbonate. It goes into the ocean.
Flegal: Into the ocean.
Meyer: And then what happens? It’s turned into ...
Flegal: It sinks and becomes part of the Earth’s crust.
Meyer: Right. Or it gets turned into a shell, a creature’s shell, and then it sinks again.
Flegal: It is functionally stable. It is thermodynamically pretty much impossible to reverse.
Meyer: And you kind of said this, but I do want to draw it out: This is the carbon cycle. This is a central Earth science process. There’s nothing fancy about this.
Jesse Jenkins: The problem is it takes centuries to play out. It’s just moving on geologic time. But this idea of enhanced weathering means we can potentially speed that up, right?
Meyer: Sorry, I just want to — this is, like, the whole problem of climate change, right? The problem of climate change is that we take fossil fuels and carbon that’s stored in geological storage out of the ground on historic time scales, on decadal ... you know, every year we take millions of tons of it out of the ground, and then it would only be restored back to the ground by this extremely slow process.
Flegal: One way to think about carbon removal is, like, taking stuff out of the fast cycle and putting it into the slow cycle, basically. And essentially, you either inject CO2 underground, where it’s where it’s stable, or you turn it into salt. These are kind of the options.
And so enhanced weathering, to exactly this point, it’s enhanced for a reason, right? There’s regular old weathering, and then there’s the enhanced kind, which aims to speed up this process that typically takes millennia to years or days by either using more reactive materials than the normal rocks that would just weather naturally or increasing the surface area of the material that is exposed to CO2. So grinding up rocks into very, very fine fine powder and exposing that material to more favorable environments.
This episode of Shift Key is sponsored by Advanced Energy United, KORE Power, and Yale …
Advanced Energy United educates, engages, and advocates for policies that allow our member companies to compete to power our economy with 100% clean energy, working with decision makers and energy market regulators to achieve this goal. Together, we are united in our mission to accelerate the transition to 100% clean energy in America. Learn more at advancedenergyunited.org/heatmap
KORE Power provides the commercial, industrial, and utility markets with functional solutions that advance the clean energy transition worldwide. KORE Power's technology and manufacturing capabilities provide direct access to next generation battery cells, energy storage systems that scale to grid+, EV power & infrastructure, and intuitive asset management to unlock energy strategies across a myriad of applications. Explore more at korepower.com — the future of clean energy is here.
Build your skills in policy, finance, and clean technology at Yale. Yale’s Financing and Deploying Clean Energy certificate program is a 10-month online certificate program that trains and connects clean energy professionals to catalyze an equitable transition to a clean economy. Connect with Yale’s expertise, grow your professional network, and deepen your impact. Learn more at cbey.yale.edu/certificate.
Music for Shift Key is by Adam Kromelow.
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America’s largest renewable developer is swallowing up the utility at the heart of the data center boom.
NextEra Energy, which also owns the utility Florida Power & Light, announced Monday morning that it had agreed to acquire Dominion Energy, the utility that operates in Virginia and the Carolinas. The deal would create an energy giant valued at around $67 billion. It would also — importantly for Virginia and PJM Interconnection, the 13-state electricity market of which the state is a part — create a battery electric storage giant.
The companies said in a Monday presentation laying out the case for the merger to investors that the combined entity would be the largest power company in the United States and the third largest energy company behind just ExxonMobil and Chevron. The companies projected that, when combined, they would be the domestic leader in total generation, market capitalization, rate base, annual capital expenditure, total generation built, and, specifically, battery storage capacity.
NextEra is already a storage leader. Its Florida utility is planning to add 7.6 gigawatts of battery storage over the next decade, and its development arm added almost a gigawatt of storage to its backlog in just the first quarter of this year.
NextEra’s storage expertise couldn’t come at a better time for Dominion. Virginia passed a law in April mandating that the utility procure 16 gigawatts of short-duration storage and 4 gigawatts of long-duration storage by 2045, with 4 gigawatts of short-term storage coming by 2030. Compare that to a previous state target for Dominion of around 3 gigawatts of storage 2035 and the challenge becomes apparent.
“With NextEra Energy’s world leadership in battery storage, there’s a potential to accelerate Dominion Energy’s capital plan to meet Virginia’s storage goals,” NextEra Chief Executive John Ketchum said on a call with analysts discussing the merger plans.
The market Dominion operates in in Virginia, PJM Interconnection, has long been a laggard in bringing new storage resources onto its grid, thanks to its famously dysfunctional interconnection queue. Although its newly refreshed queue has seen a large increase in storage projects compared to when the organization closed it to new projects in 2022, the market is still well behind storage-friendly peers like California and Texas.
PJM has also become notorious more recently for its capacity market, which has fueled price increases across the region in the billions of dollars, and yet failed to procure the reserve margin PJM typically aims for in its most recent auction. “Given that we’re the world’s leader in battery storage and the legislation that was just passed by Virginia, there is a tremendous opportunity to meet that capacity short quickly by deploying battery storage in the right places,” Ketchum said Monday. “We know what a big impact battery storage can have, and how quickly it can have it on capacity-short positions. And so we look at a Dominion in Virginia with [a] short capacity position — I think there’s a real opportunity to accelerate investment.”
The proposed deal comes at a time of rising prices and public anger at utilities up and down the Eastern Seaboard, and especially in the Mid-Atlantic. Dominion’s rates in Virginia have risen around 36% in the past four years, according to the Heatmap-M.I.T. Electricity Price Hub, while typical bills have risen from about $96 per month to $146 per month. Virginia’s rates have grown faster than average in PJM, but are still well below the increases in states like Maryland and New Jersey despite serving a fast-growing data center industry.
While elected Democrats in PJM states regularly bash utilities (see: New Jersey and Pennsylvania), it’s possible that both Virginians and Virginia might look favorably on NextEra, Jefferies analyst Julien Dumoulin-Smith wrote in a note to clients Monday. “If [NextEra] focuses on storage development under the new Democratic legislation recently passed, it could form a coalition of support; we believe this is [a] critical point that could make the deal approval process less bumpy than some other recent M&A deals.”
Morningstar analyst Andrew Bischof saw the deal as allowing each side to use the other’s expertise (and balance sheet) to ramp up investment. Dominion might be able “leverage NextEra’s strong balance sheet to accelerate investment, particularly in Virginia,” whereas NextEra “could accelerate its data center ambitions, which had trailed those of its regulated peers, by using Dominion’s expertise and relationships to expedite NextEra’s data center hub plans,” he wrote in a note to clients Monday.
Building out more storage could also be great for a regulated utility like Dominion, as it would get to put new resources into its rate base and garner a return on equity.
“The General Assembly just added new storage requirements for us, which we think are going to be great for our customers, being able to work with Nextera and this combined company on that,” Dominion chief executive Robert Blue said on the call. “I think this is really going to benefit our customers as we serve them better and will deploy capital faster that way.”
On Thacker Pass, the Bonneville Power Administration, and Azerbaijan’s offshore wind
Current conditions: New York City is bracing for triple-digit heat in some parts of the five boroughs this week • The warm-up along the East Coast could worsen the drought parching the country’s southeastern shores • After Sunday reached 95 degrees Fahrenheit in the war-ravaged Gaza, temperatures in the Palestinian enclave are dropping back into the 80s and 70s all week.
Assuming world peace is something you find aspirational, here’s the good news: By all accounts, President Donald Trump’s two-day summit in Beijing with Chinese President Xi Jinping went well. Here’s the bad news: The energy crisis triggered by the Iran War is entering a grim new phase. Nearly 80 countries have now instituted emergency measures as the world braces for slow but long-predicted reverberations of the most severe oil shock in modern history. With demand for air conditioning and summer vacations poised to begin in the northern hemisphere’s summer, already-strained global supplies of crude oil, gasoline, diesel, and jet fuel will grow scarcer as the United States and Iran mutually blockade the Strait of Hormuz and halt virtually all tanker shipments from each other’s allies. “We are taking that outcome very seriously,” Paul Diggle, the chief economist at fund manager Aberdeen, told the Financial Times, noting that his team was now considering scenarios where Brent crude shoots up to $180 a barrel from $109 a barrel today. “We are living on borrowed time.”
The weekend brought a grave new energy concern over the conflict’s kinetic warfare. On Sunday, the United Arab Emirates condemned a drone strike it referred to as a “treacherous terrorist attack” that caused a fire near Abu Dhabi’s Barakah nuclear station. The UAE’s top English-language newspaper, The National, noted that the government’s official statement did not blame Iran explicitly. The attack came just a day after the International Atomic Energy Agency raised the alarm over drone strikes near nuclear plants after a swarm of more than 160 drones hovered near key stations in Ukraine last week.
We are apparently now entering the megamerger phase of the new electricity supercycle. On Friday, the Financial Times broke news that NextEra Energy is in talks with rival Dominion Energy for a tie-up that would create a more than $400 billion utility behemoth in one of the biggest deals of all time. The merger talks, which The Wall Street Journal confirmed, could be announced as early as this week. The combined company would reach from Dominion’s homebase of Virginia, where the northern half of the state is serving as what the FT called “the heartland of U.S. digital infrastructure serving the AI boom,” down to NextEra’s home-state of Florida, where the subsidiary Florida Power & Light serves roughly 6 million customers. While Dominion dominates data centers in Northern Virginia, NextEra last year partnered with Google to build more power plants and even reopen the Duane Arnold nuclear station in Iowa.

Trump digs lithium. In fact, he’s such a fan of Lithium Americas’ plan to build North America’s largest lithium mine on federal land in Nevada that he renegotiated a Biden-era deal to finance construction of the Thacker Pass project to secure a 5% equity stake in the publicly-traded developer. Yet the White House’s macroeconomic policies are pinching the nation’s lithium champion. During its first-quarter earnings call with investors last week, Lithium Americas cautioned that the Trump administration’s steel tariffs, coupled with inflation from disrupted shipments through the Strait of Hormuz, could add between $80 million and $120 million to construction costs at Thacker Pass. Most of the impact, Mining.com noted, is expected this year. Once mining begins, the project could spur new discussion of a strategic lithium reserve, the case for which Heatmap’s Matthew Zeitlin articulated here.
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The Department of Energy has selected Travis Kavulla, an energy industry veteran, as the 17th chief executive and administrator of the Bonneville Power Administration, NewsData reported. Founded under then-President Franklin D. Roosevelt in 1937, the federal agency is a holdover from the New Deal era before utilities had built out electrical networks in rural parts of the U.S. Unlike the Tennessee Valley Authority — which functions as a standalone utility that owns and sells power, though it’s wholly owned by the federal government and its board of directors is appointed by the White House — the BPA, as it’s known, is a power marketing agency that sells electricity from hydroelectric dams owned by the Army Corps of Engineers and the Department of the Interior’s Bureau of Reclamation. Kavulla currently serves as the head of policy for Base Power, the startup building a network of distributed batteries to back up the grid. He previously worked as the regulatory chief at the utility NRG Energy, and as a state utility commissioner in his home state of Montana. NewsData, a trade publication focused on Western energy markets, cautioned that the Energy Department may hold off on announcing the appointment for “the next few days or weeks” as sources warned that “it might be delayed while the department conducts a background check, or to allow the new undersecretary of energy, Kyle Haustveit, to be confirmed.”
Reached Sunday night via LinkedIn message, Kavulla politely declined to comment on whether he was appointed to lead the BPA.
Offshore wind may be spinning in reverse in the U.S. as the Trump administration attempts to, as Heatmap’s Jael Holzman put it, “murder” an industry through death by a thousand cuts. But elsewhere in the world, offshore wind is booming. Just look at Azerbaijan. Despite its vast reserves of natural gas, the nation on the Caspian Sea is looking into building its first offshore turbines. On Friday, offshoreWIND.biz reported that the Azerbaijan Green Energy Company, owned by the Baku-based industrial giant Nobel Energy, had commissioned a Spanish company to design a floating LiDAR-equipped buoy for the country’s first turbines in the Caspian. The debut project, backed by the Azeri government, would start with 200 megawatts of offshore wind and eventually triple in size.
Before the wealthy software entrepreneur Greg Gianforte ran to be governor of Montana, he donated millions of dollars to a Christian-themed museum that claims humans walked alongside dinosaurs and the Earth is just 6,000 years old. After winning the state’s top job, the Republican set about revoking virtually all policies related to climate change, including banning the projected effects of warming from state agencies’ risk forecasts. With drought withering the state, however, Gianforte has turned to perhaps the most ancient policy approach humanities leaders have called upon to fix devastating weather patterns: Pray. On Sunday, Gianforte declared an official day of prayer for rain. “Prayer is the most powerful tool we have,” he wrote in a post on X. “I ask all who are faithful to come to God with thanks and pray.”
With construction deadlines approaching, developers still aren’t sure how to comply with the new rules.
Certainty, certainty, certainty — three things that are of paramount importance for anyone making an investment decision. There’s little of it to be found in the renewable energy business these days.
The main vectors of uncertainty are obvious enough — whipsawing trade policy, protean administrative hostility toward wind, a long-awaited summit with China that appears to have done nothing to resolve the war with Iran. But there’s still one big “known unknown” — rules governing how companies are allowed to interact with “prohibited foreign entities,” which remain unwritten nearly a year after the One Big Beautiful Bill Act slapped them on just about every remaining clean energy tax credit.
The list of countries that qualify as “foreign entities of concern” is short, including Russian, Iran, North Korea, and China. Post-OBBBA, a firm may be treated as a “foreign-influenced entity” if at least 15% of its debt is issued by one of these countries — though in reality, China is the only one that matters. This rule also kicks in when there’s foreign entity authority to appoint executive officers, 25% or greater ownership by a single entity or a combined ownership of at least 40%.
Any company that wants to claim a clean energy tax credit must comply with the FEOC rules. How to calculate those percentages, however, the Trump administration has so far failed to say. This is tricky because clean energy projects seeking tax credits must be placed in service by the end of 2027 or start construction by July 4 of this year, which doesn’t leave them much time left to align themselves with the new rules.
While the Treasury Department published preliminary guidance in February, it largely covered “material assistance,” the system for determining how much of the cost of the project comes from inputs that are linked to those four nations (again, this is really about China). That still leaves the issue of foreign influence and “effective control,” i.e. who is allowed to own or invest in a project and what that means.
This has meant a lot of work for tax lawyers, Heather Cooper, a partner at McDermott Will & Schulte, told me on Friday.
“The FEOC ownership rules are an all or nothing proposition,” she said. “You have to satisfy these rules. It’s not optional. It’s not a matter of you lose some of the credits, but you keep others. There’s no remedy or anything. This is all or nothing.”
That uncertainty has had a chilling effect on the market. In February, Bloomberg reported that Morgan Stanley and JPMorgan had frozen some of their renewables financing work because of uncertainty around these rules, though Cooper told me the market has since thawed somewhat.
“More parties are getting comfortable enough that there are reasonable interpretations of these rules that they can move forward,” she said. “The reality is that, for folks in this industry — not just developers, but investors, tax insurers, and others — their business mandate is they need to be doing these projects.”
Some of the most frequent complaints from advisors and trade groups come around just how deep into a project’s investors you have to look to find undue foreign ownership or investment.
This gets complicated when it comes to the structures involved with clean energy projects that claim tax credits. They often combine developers (who have their own investors), outside investment funds, banks, and large companies that buy the tax credits on the transferability market.
These companies — especially the banks, which fund themselves with debt — “don’t know on any particular date how much of their debt is held by Chinese connected lenders, and therefore they’re not sure how the rules apply, and that’s caused a couple of banks to pull out of the tax equity market,” David Burton, a partner at Norton Rose Fulbright, told me. “It seems pretty crazy that a large international bank that has its debt trading is going to be a specified foreign entity because on some date, a Chinese party decided to take a large position in its debt.”
For those still participating in the market, the lack of guidance on debt and equity provisions has meant that lawyers are having to ascend the ladder of entities involved in a project, from private equity firms who aren’t typically used to disclosing their limited partners to developers, banks, and public companies that buy the tax credits.
“We’re having to go to private equity funds and say, hey, how many of your LPs are Chinese?” David Burton, a partner at Norton Rose Fulbright, told me. This is not information these funds are typically particularly eager to share. If a lawyer “had asked a private equity firm please tell us about your LPs, before One Big Beautiful Bill, they probably would have told us to go jump in the lake,” Burton said.
Still, the deals are still happening, but “the legal fees are more expensive. The underwriting and due diligence time is longer, there are more headaches,” he told me.
Typically these deals involve joint ventures that formed for that specific deal, which can then transfer the tax credits to another entity with more tax liability to offset. The joint venture might be majority owned by a public company, with a large minority position held by a private equity fund, Burton said.
For the public company, Burton said, his team has to ask “Are any of your shareholders large enough that they have to be disclosed to the SEC? Are any of those Chinese?” For the private equity fund, they have to ask where its investors are residents and what countries they’re citizens of. While private equity funds can be “relatively cooperative,” the process is still a “headache.”
“It took time to figure out how to write these certifications and get me comfortable with the certification, my client comfortable with it, the private equity firm comfortable with it, the tax credit buyer comfortable with it,” he told me, referring to the written legal explanation for how companies involved are complying with what their lawyers think the tax rules are.
Players such as the American Council on Renewable Energy hope that guidance will cut down on this certification time by limiting the universe of entities that will have to scrub their rolls of Chinese investors or corporate officers.
“It’d be nice if we knew you only have to apply the test at the entity that’s considered the tax owner of the project,” i.e. just the joint venture that’s formed for a specific project, Cooper told me.
“There’s a pretty reasonable and plain reading of the statute that limits the term ’taxpayer’ to the entity that owns the project when it’s placed in service,” Cooper said.
Many in the industry expect more guidance on the rules by the end of year, though as Burton noted, “this Treasury is hard to predict.”
In the meantime, expect even more work for tax lawyers.
“We’re used to December being super busy,” Burton said. “But it now feels like every month since the One Big Beautiful Bill passed is like December, so we’ve had, like, you know, eight Decembers in a row.”