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How Equatic solved seawater’s toxic gas problem and delivered a two-for-one solution: removing carbon while producing green hydrogen
Since at least the 1970s, electrochemists have cast their gazes upon the world’s vast, briny seas and wondered how they could harness the endless supply of hydrogen locked within. Though it was technically possible to grab the hydrogen by running an electrical current through the water, the reaction turned the salt in the water into the toxic and corrosive gas chlorine, which made commercializing such a process challenging.
But last year, a startup called Equatic made a breakthrough that not only solves the chlorine problem, but has the potential to deliver a two-for-one solution: commercial hydrogen production and carbon removal. With funding from the Department of Energy’s Advanced Research Projects Agency-Energy, or ARPA-E, the company moved swiftly to scale its innovation, called an “oxygen-selective anode,” from the lab to the factory. On Thursday, it announced it had started manufacturing the anodes at a facility in San Diego.
“I want to emphasize how fast this has moved,” Doug Wicks, a program director at ARPA-E, told me. “They made some pretty large claims about what they could do, so we took it as a high risk project, and really within the first year, they were able to clearly demonstrate that they could make great progress.”
In 2021, Equatic’s co-founders Xin Chen and Gaurav Sant, who are researchers at the University of California, Los Angeles, applied for an ARPA-E grant to work on their idea for a hybrid system that would use seawater electrolysis — sending an electrical current through seawater — to sequester carbon dioxide from the air in the ocean while also producing hydrogen.
Setting aside the chlorine issue for a moment, the process of getting hydrogen out of water is pretty established science. The carbon removal part was new. To achieve it, they would exploit another aspect of the electrolytic reaction: It could separate the seawater into two streams — one very acidic, the other very alkaline and able to easily absorb CO2. If they exposed the alkaline stream to air, it would suck up CO2 like a sponge and convert it into a more stable molecule that couldn’t easily return to the atmosphere. Then they could feed the water back into the sea, enhancing the ocean’s natural carbon pump.
This approach to carbon removal has two big things going for it. First, by driving this reaction through a closed system on land, Equatic can measure the carbon sequestered much more precisely than related methods that are deployed in the open ocean. “You can count what comes in, you can count what goes out, you just have greater control,” David Koweek, the chief scientist at Ocean Visions, a nonprofit that advocates for ocean-based climate solutions, told me. But with that control comes a trade-off, Koweek said. It requires more infrastructure, energy, and operational complexity than something like adding antacids directly to the water. That’s where Equatic’s second advantage could help. Its process produces clean hydrogen, a valuable commodity, which can help defray the cost of the carbon removal.
“We're not just a one way street, only energy in — you actually get some energy out,” Edward Sanders, the company’s chief operating officer, told me. He provided some numbers: For every 2.5 megawatt-hours of electricity Equatic’s system consumes, it can remove 1 metric ton of carbon from the air and produce 1 megawatt-hour worth of energy in the form of hydrogen. The company can either use the hydrogen to help power its operations or sell it. Therefore, the net energy use is more like 1.5 megawatts, he said, which is lower than what a direct air capture plant, for example, requires. (A direct air capture plant using a solid sorbent needs about 2.6 megawatts per ton of CO2 removed, according to the International Energy Agency.) Energy accounts for about 70% of costs, Sanders said.
Equatic was able to prove its concept out in two small pilot projects deployed in the Los Angeles harbor and in Singapore that each removed about 100 kilograms of carbon from the air, and produced just a few kilograms of hydrogen, per day. But because of the chlorine issue, the two plants were expensive, using bespoke, corrosion-resistant materials. Sanders told me it would cost on the order of millions of dollars to manage the chlorine gas at scale. The company would need to find a more economic solution.
The formation of chlorine in seawater electrolysis is a problem that has stumped scientists for so long that it has split the electrochemists into two camps — those who still believe it’s solvable, and those who think it makes more sense to just purify the water first.
When I asked Chen what the day-to-day work of trying to overcome this looked like, he said it was materials science research. He needed to find the right combination of catalysts to make an anode — a sheet of conductive, positively-charged metal — that, when used in electrolysis, would screen out the salt and not allow it to react. “It’s like Gandalf holding the way to tell chlorine, ‘you shall not pass.’” he said. “That’s essentially how it works. Only water molecules can pass through.”
Chen and Sant were awarded $1 million from ARPA-E for the research in 2022. About a year later, they felt they were on to something. As with most scientific “breakthroughs,” there was no single moment of discovery — Chen was not even the first to do what he did, which was to use manganese oxide. “There’s a lot of literature that indicates it’s doable,” he told me. “There’s pioneering work by other scientists from almost 30 years ago, but they didn’t pursue it far enough because I don’t think the opportunity was right at that time.”
What Chen did was push to find an iteration that was more effective, durable, and affordable. He ultimately landed on a design that produced less than one part per million of chlorine — lower than the amount in drinking water — and performed reliably for more than 20,000 hours of testing. When he showed his progress to Wicks at ARPA-E, the agency was impressed enough to grant the scientists an additional $2 million. That funding helped them get their first production line up and running.
The facility in San Diego will be able to produce 4,000 anodes per year to start, and is expected to operate at full capacity by the end of 2024. It will produce the anodes for Equatic’s first demonstration-scale project, a new plant in Singapore designed to remove 10 metric tons of CO2 and produce 300 kilograms of hydrogen per day — 100 times larger than the pilot version. Equatic also has plans to build an even bigger plant in Quebec that can remove 300 tons per day. That’s about three times the capacity of Climeworks’ Mammoth plant, the world’s largest direct air capture plant operating today.
The manufacturing line will also be able to refurbish the anodes after about three years of use, simply by applying a new layer of catalysts. Wicks of ARPA-E told me this was a “breakthrough coating technique” that will allow the company to really decrease costs.
When I asked Wicks what he sees as the next milestones for Equatic, what will determine whether it will be successful, he said a lot was riding on the scale up in Singapore and Canada. The company has already signed an agreement to deliver 2,100 metric tons of hydrogen to Boeing and remove 62,000 metric tons of CO2 from the air on the aerospace giant’s behalf. The companies have not made the price of the deal public.
One challenge ahead will also be navigating the permitting environment in the different countries. Koweek of Ocean Visions told me that this kind of seawater chemistry modification was “relatively benign,” but he said there were still risks that had to be characterized.
In the meantime, Chen isn’t done trying to optimize his anode in the lab. I asked him how he felt after his initial discovery — were you excited? Did you celebrate?
“Not really,” he replied. “So I’m very excited inside. But I was generally thinking about it, can we push it further?”
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Empire Wind has been spared — but it may be one of the last of its kind in the U.S.
It’s been a week of whiplash for offshore wind.
On Monday, President Trump lifted his stop work order on Empire Wind, an 810-megawatt wind farm under construction south of Long Island that will deliver renewable power into New York’s grid. But by Thursday morning, Republicans in the House of Representatives had passed a budget bill that would scrap the subsidies that make projects like this possible.
The economics of building offshore wind in the U.S., at least during this nascent stage, are “entirely dependent” on tax credits, Marguerite Wells, the executive director of Alliance for Clean Energy New York, told me.
That being said, if the bill gets through the Senate and becomes law, Empire Wind may still be safe. The legislation would significantly narrow the window for projects to qualify for tax credits, requiring them to start construction by the end of this year and be operational by the end of 2028. Equinor, the company behind Empire Wind, maintains that it aims to reach commercial operations as soon as 2027. The four other offshore wind projects that are under construction in the U.S. — Sunrise Wind, also serving New York; Vineyard Wind, serving Massachusetts; Revolution Wind, serving Rhode Island and Connecticut; and Dominion Energy’s project in Virginia — are also expected to be completed before the cutoff.
Together, the five wind farms are expected to generate enough power for roughly 2.5 million homes and avoid more than 9 million tons of carbon emissions each year — similar to shutting down 23 natural gas-fired power plants.
Still, this would represent just a small fraction of the carbon-free energy eastern states are counting on offshore wind to provide. New York, for example, has a statutory goal of getting at least 9 gigawatts of power from the industry. Once Empire and Sunrise are completed, it will have just 1.7 gigawatts.
If the proposed changes to the tax credits are enacted, these five projects may be the last built in the U.S.
That’s not the case for solar farms or onshore wind, Oliver Metcalfe, head of wind research at BloombergNEF told me. They can still compete with fossil fuel generation — especially in the windiest and sunniest areas — without tax credits. That’s especially true in today’s environment of rising demand for power, since these projects have the additional benefit of being quick to build. The downside of losing the tax credits is, of course, that the power will cost marginally more than it otherwise would have.
For offshore wind farms to pencil out, however, states would have to pay a much higher price for the energy they produce. The tax credits knock off about a quarter of the price, Metcalfe said; without them, buyers will be back on the hook. “It’s likely that some either wouldn’t be willing to do that, or would dramatically decrease their ambition around the technology given the potential impacts it could have on ratepayers.”
Part of the reason offshore wind is so expensive is that the industry is still new in the U.S. We lack the supply chains, infrastructure, and experienced workforce built up over time in countries like China and the U.K. that have been able to bring costs down. That’s likely not going to change by the time these five projects are built, as they are all relying on European supply chains.
The Inflation Reduction Act spurred domestic manufacturers to begin developing supply chains to serve the next wave of projects, Wells told me. It gave renewable energy projects a 10-year runway to start construction to be eligible for the tax credits. “It was a long enough time window for companies to really invest, not just in the individual generation projects, but also manufacturing, supply chain, and labor chain,” she said.
Due to Trump’s attacks on the industry, the next wave of projects may not materialize, and those budding supply chains could go bust.
Trump put a freeze on offshore wind permitting and leasing on his first day in office, a move that 17 states are now challenging in court. A handful of projects are already fully permitted, but due to uncertainty around Trump’s tariffs — and now, around whether they’ll have access to the tax credits — they’re at a standstill.
“No one’s willing to back a new offshore wind project in today’s environment because there’s so much uncertainty around the future business case, the future subsidies, the future cost of equipment,” Metcalfe said.
The House budget bill may have kept the 45Q tax credit, but nixing transferability makes it decidedly less useful.
Very few of the Inflation Reduction Act’s tax credits made it through the House’s recently passed budget bill unscathed. One of the apparently lucky ones, however, was the 45Q credit for carbon capture projects. This provides up to $180 per metric ton for direct air capture and $85 for carbon captured from industrial or power facilities, depending on how the CO2 is subsequently sequestered or put to use in products such as low-carbon aviation fuels or building materials. The latest version of the bill doesn’t change that at all.
But while the preservation of 45Q is undoubtedly good news for the increasing number of projects in this space, carbon capture didn’t escape fully intact. One of the main ways the IRA supercharged tax credits was by making them transferable, turning them into an important financing tool for small or early-stage projects that might not make enough money to owe much — or even anything — in taxes. Being able to sell tax credits on the open market has often been the only way for smaller developers to take advantage of the credits. Now, the House bill will eliminate transferability for all projects that begin construction two years after the bill becomes law.
That’s going to make the economics of an already financially unsteady industry even more difficult. “Especially given the early stage of the direct air capture industry, transferability is really key,” Giana Amador, the executive director of an industry group called the Carbon Removal Alliance, told me. “Without transferability, most DAC companies won’t be able to fully capitalize upon 45Q — which, of course, threatens the viability of these projects.”
We’re not talking about just a few projects, either. We’re talking about the vast majority, Jessie Stolark, the executive director of another industry group, the Carbon Capture Coalition, told me. “The initial reaction is that this is really bad, and would actually cut off at the knees the utility of the 45Q tax credit,” Stolark said. Out of over 270 carbon capture projects announced as of today, Stolark estimates that fewer than 10 will be able to begin construction in the two years before transferability ends.
The alternative to easily transferable tax credits is a type of partnership between a project developer and a tax equity investor such as a bank. In this arrangement, investors give project developers cash in exchange for an equity stake in their project and their tax credit benefits. Deals like this are common in the renewable energy industry, but because they’re legally complicated and expensive, they’re not really viable for companies that aren’t bringing in a lot of revenue.
Because carbon capture is a much younger, and thus riskier technology than renewables, “tax equity markets typically require returns of 30% or greater from carbon capture and direct air capture project developers,” Stolark told me. That’s a much higher rate than tax equity partners typically require for wind or solar projects. “That out of the gate significantly diminishes the tax credit's value.” Taken together with inflation and high interest rates, all this means that “far fewer projects will proceed to construction,” Stolark said.
One DAC company I spoke with, Bay Area-based Noya, said that now that transferability is out, it has been exploring the possibility of forming tax equity partnerships. “We’ve definitely talked to banks that might be interested in getting involved in these kinds of things sooner than they would have otherwise gotten involved, due to the strategic nature of being partnered with companies that are growing fast,” Josh Santos, Noya’s CEO, told me.
It would certainly be a surprise to see banks — which are generally quite risk averse — lining up behind these kinds of new and unproven technologies, especially given that carbon capture doesn’t have much of a natural market. While CO2 can be used for some limited industrial purposes — beverage carbonation, sustainable fuels, low-carbon concrete — the only market for true carbon dioxide removal is the voluntary market, in which companies, governments, or individuals offset their own emissions by paying companies to remove carbon from the atmosphere. So if carbon capture is going to become a thriving, lucrative industry, it’s likely going to be heavily dependent on future government incentives, mandates, or purchasing commitments. And that doesn’t seem likely to happen in the U.S. anytime soon.
Noya, which is attempting to deploy its electrically-powered, modular direct air capture units beginning in 2027, is still planning on building domestically, though. As Santos told me, he’s eyeing California and Texas as promising sites for the company’s first projects. And while he said that the repeal of transferability will certainly “make things more complicated,” it is not enough of a setback for the company to look abroad.
“45Q is a big part of why we are focused on the U.S. mainly as our deployment site,” Santos explained. “We’ve looked at places like Iceland and the Middle East and Africa for potential deployment locations, and the tradeoff of losing 45Q in exchange for a cheaper something has to be significant enough for that to make sense,” he told me — something like more cost efficient electricity, permitting or installation costs. Preserving 45Q, he told me, means Noya’s long-term project economics are still “great for what we’re trying to build.”
But if companies can’t weather the short-term headwinds, they’ll never be able to reach the level of scale and profitability that would allow them to leverage the benefits of the 45Q credits directly. For many DAC companies such as Climeworks, which built the industry’s largest facility in Iceland, Amador and Stolark said that the domestic policy environment is causing hesitation around expanding in the U.S.
“We are very much at risk of losing our US leadership position in the industry,” Stolark told me. Meanwhile, she said that Canada, China, and the EU are developing policies that are making them increasingly attractive places to build.
As Amador put it, “I think no matter what these projects will be built, it’s just a question of whether the United States is the most favorable place for them to be deployed.”
House Republicans have bet that nothing bad will happen to America’s economic position or energy supply. The evidence suggests that’s a big risk.
When President Barack Obama signed the Budget Control Act in August of 2011, he did not do so happily. The bill averted the debt ceiling crisis that had threatened to derail his presidency, but it did so at a high cost: It forced Congress either to agree to big near-term deficit cuts, or to accept strict spending limits over the years to come.
It was, as Bloomberg commentator Conor Sen put it this week, the wrong bill for the wrong moment. It suppressed federal spending as America climbed out of the Great Recession, making the early 2010s economic recovery longer than it would have been otherwise. When Trump came into office, he ended the automatic spending limits — and helped to usher in the best labor market that America has seen since the 1990s.
On Thursday, the Republican majority in the House of Representatives passed their megabill — which is dubbed, for now, the “One Big, Beautiful Bill Act” — through the reconciliation process. They did so happily. But much like Obama’s sequestration, this bill is the wrong one for the wrong moment. It would add $3.3 trillion to the federal deficit over the next 10 years. The bill’s next stop is the Senate, where it could change significantly. But if this bill is enacted, it will jack up America’s energy and environmental risks — for relatively little benefit.
It has become somewhat passé for advocates to talk about climate change, as The New York Times observed this week. “We’re no longer talking about the environment,” Chad Farrell, the founder of Encore Renewable Energy, told the paper. “We’re talking dollars and cents.”
Maybe that’s because saying that something “is bad for the climate” only makes it a more appealing target for national Republicans at the moment, who are still reveling in the frisson of their post-Trump victory. But one day the environment will matter again to Americans — and this bill would, in fact, hurt the environment. It will mark a new chapter in American politics: Once, this country had a comprehensive climate law on the books. Then Trump and Republicans junked it.
The Republican megabill will make climate change worse. Within a year or two, the U.S. will be pumping out half a gigaton more carbon pollution per year than it would in a world where the IRA remains on the books, according to energy modelers at Princeton University. Within a decade, it will raise American carbon pollution by a gigaton each year. That is a significant increase. For comparison, the United States is responsible for about 5.2 gigatons of greenhouse gas pollution each year. No matter what happens, American emissions are likely to fall somewhat between now and 2035 — but, still, we are talking about adding at least an extra year’s worth of emissions over the next decade. (Full disclosure: I co-host a podcast, Shift Key, with Jesse Jenkins, the lead author of that Princeton study.)
What does America get for this increase in air pollution? After all, it’s possible to imagine situations where such a surge could bring economic benefits. In this case, though, we don’t get very much at all. Repealing the tax credits will slash $1 trillion from GDP over the next decade, according to the nonpartisan group Energy Innovation. Texas will be particularly hard hit — it could lose up to $100 billion in energy investment. Across the country, household energy costs will rise 2% to 7% by 2035, on top of any normal market-driven volatility, according to the energy research firm the Rhodium Group. The country will become more reliant on foreign oil imports, yet domestic oil production will budge up by less than 1%.
In other words, in exchange for more pollution, Americans will get less economic growth but higher energy costs. The country’s capital stock will be smaller than it would be otherwise, and Americans will work longer hours, according to the Tax Foundation.
But this numbers-driven approach actually understates the risk of repealing the IRA’s tax credits. The House megabill raises two big risks to the economy, as I see it — risks that are moresignificant than the result of any one energy or economic model.
The first is that this bill — its policy changes and its fiscal impact — will represent a double hit to the capacity of America’s energy system. The Inflation Reduction Act’s energy tax credits were designed to lower pollution and reduce energy costs by bringing more zero-carbon electricity supply onto the U.S. power grid. The law didn’t discriminate about what kind of energy it encouraged — it could be solar, geothermal, or nuclear — as long as it met certain emissions thresholds.
This turned out to be an accidentally well-timed intervention in the U.S. energy supply. The advent of artificial intelligence and a spurt of factory building has meant that, in the past few years, U.S. electricity demand has begun to rise for the first time since the 1990s. At the same time, the country’s ability to build new natural gas plants has come under increasing strain. The IRA’s energy tax credits have helped make this situation slightly less harrowing by providing more incentives to boost electricity supply.
Republicans are now trying to remove these tax bonuses in order to finance tax cuts for high-earning households. But removing the IRA alone won’t pay for the tax credits, so they will also have to borrow trillions of dollars. This is already straining bond markets, driving up interest rates for Americans. Indeed, a U.S. Treasury auction earlier this week saw weak demand for $16 billion in bonds, driving stocks and the dollar down while spiking treasury yields.
Higher interest rates will make it more expensive to build any kind of new power plant. At a moment of maximum stress on the grid, the U.S. is going to pull away tax bonuses for new electricity supply and make it more expensive to do any kind of investment in the power system. This will hit wind, solar, and batteries hard; because renewables don’t have to pay for fuel, their cost variability is largely driven by financing. But higher interest rates will also make it harder to build new natural gas plants. Trump’s trade barriers and tariff chaos will further drive up the cost of new energy investment.
Republicans aren’t totally oblivious to this hazard. The House Natural Resource Committee’s permitting reform proposal could reduce some costs of new energy development and encourage greater power capacity — assuming, that is, that the proposal survives the Senate’s byzantine reconciliation rules. But even then, significant risk exists for runaway energy cost chaos. Over the next three years, America’s liquified natural gas export capacity is set to more than double. Trump officials have assumed that America will simply be able to drill for more natural gas to offset a rise in exports, but what if higher interest rates and tariff charges forbid a rise in capacity? A power price shock is not off the table.
So that’s risk No. 1. The second risk is arguably of greater strategic import. As part of their megabill, House Republicans have stripped virtually every demand-side subsidy for electric vehicles from the bill, including a $7,500 tax credit for personal EV purchases. At the same time, Senate Republicans and the Trump administration have gutted state and federal rules meant to encourage electric vehicle sales.
Republicans have kept, for now, some of the supply-side subsidies for manufacturing EVs and batteries. But without the paired demand-side incentives, American EV sales will fall. (The Princeton energy team projects an up to 40% decline in EV sales nationwide.) This will reduce the economic rationale for much of the current buildout in electric vehicle manufacturing and capacity happening across the country — it could potentially put every new EV and battery factory meant to come online after this year out of the money.
This will weaken the country’s economic competitiveness. Batteries are a strategic energy technology, and they will undergird many of the most important general and military technologies of the next several decades. (If you can make an EV, you can make an autonomous drone.) The Trump administration has realized that the United States and its allies need a durable mineral supply chain that can at least parallel China’s. But they seem unwilling to help any of the industries that will actually usethose minerals.
Does this mean that Republicans will kill America’s electric vehicle industry? Not necessarily. But they will dent its growth, strength, and expansion. They will make it weaker and more vulnerable to external interference. And they will increase the risks that the United States simply gives up on ever understanding battery technology and doubles down on internal combustion vehicles — a technology that, like coal-powered naval ships, is destined to lose.
It is, in other words, risky. But that is par for the course for this bill. It is risky to make the power grid so exposed to natural gas price volatility. It is risky to jack up the federal deficit during peacetime for so little gain. It is risky to cede so much demand for U.S.-sourced critical minerals. It is risky to raise interest rates in an era of higher trade barriers, uncertain supply shocks, and geopolitical instability.
This is what worries me most about the Republican megabill: It takes America’s flawed but fixable energy policy and replaces it with, well, a longshot parlay bet that nothing particularly bad will happen anytime soon. Will the Senate take such a bet? Now we find out.
Editor’s note: This story has been updated to correct the units in the sixth paragraph from megatons to gigatons.