Sign In or Create an Account.
By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy
Welcome to Heatmap
Thank you for registering with Heatmap. Climate change is one of the greatest challenges of our lives, a force reshaping our economy, our politics, and our culture. We hope to be your trusted, friendly, and insightful guide to that transformation. Please enjoy your free articles. You can check your profile here .
subscribe to get Unlimited access
Offer for a Heatmap News Unlimited Access subscription; please note that your subscription will renew automatically unless you cancel prior to renewal. Cancellation takes effect at the end of your current billing period. We will let you know in advance of any price changes. Taxes may apply. Offer terms are subject to change.
Subscribe to get unlimited Access
Hey, you are out of free articles but you are only a few clicks away from full access. Subscribe below and take advantage of our introductory offer.
subscribe to get Unlimited access
Offer for a Heatmap News Unlimited Access subscription; please note that your subscription will renew automatically unless you cancel prior to renewal. Cancellation takes effect at the end of your current billing period. We will let you know in advance of any price changes. Taxes may apply. Offer terms are subject to change.
Create Your Account
Please Enter Your Password
Forgot your password?
Please enter the email address you use for your account so we can send you a link to reset your password:
Widespread federal layoffs bring even more uncertainty to the DAC hubs program.
On congestion pricing, carbon capture progress, and Tim Kaine.
Chestnut Carbon announces a major new funding round on the heels of its deal with Microsoft.
Three tactics from Erin Burns, executive director of Carbon180, on how the industry can use this time wisely.
Absolute Climate wants to grade all carbon credits the exact same way.
What’s a big multinational like Microsoft to do when it wants to build with clean concrete?
Fire prevention comes as part of the deal.
Deep in Inyo National Forest in the Eastern Sierra Nevada are a couple of bright white domed tents protecting an assemblage of technical equipment and machinery that, admittedly, looks a bit out of place amidst the natural splendor. Surrounding shipping containers boast a large “Charm Industrial” logo, an indication that, yes, the U.S. Forest Service is now working with the well-funded carbon removal startup in a two-for-one endeavor to reduce wildfire risk and permanently remove carbon from the atmosphere.
The federal agency and its official nonprofit partner, the National Forest Foundation, have partnered with San Francisco-based Charm on a pilot program to turn leftover trees and other debris from forest-thinning operations into bio-oil, a liquid made from organic matter, to be injected underground. The project is a part of a larger Cal Fire grant, to implement forest health measures as well as seek out innovative biomass utilization solutions. If the pilot scales up, Charm can generate carbon removal credits by permanently locking away the CO2 from biomass, while the Forest Service will finally find a use for the piles of leftover trees that are too small for the sawmill’s taste.
“It's actually pretty shocking how big the backlog of wildfire fuel reduction projects is in the United States,” Peter Reinhardt, co-founder and CEO at Charm, told me. “The pattern of putting out fires as much as possible, as quickly as possible, has created just an enormous amount of fuel in our forests that has to be treated one way or another.” Controlled burns and forest thinning are the primary ways of dealing with this fuel buildup, but as Reinhardt explained to me, California has few pellet mills, and thus few offtakers for leftover wood. What’s left often ends up being burned in a big pile.
That’s common at Inyo, which is considered a “biomass utilization desert,” according to Katlyn Lonergan, a program coordinator with the National Forest Foundation. NFF is paying Charm a nominal fee to take the waste biomass off their hands, though not nearly enough to constitute a primary source of revenue for the company.
At this point, funding isn’t a problem at Charm. Last year, the company announced a $100 million Series B round and received a $53 million commitment from Frontier, the Big Tech-led carbon removal initiative, to permanently remove 112,000 tons of CO2 between 2024 and 2030, the coalition’s first offtake agreement. At the time, Charm had delivered over 6,000 tons of removal, “more than any other permanent CDR supplier to date,” the group wrote. Since then, the company has received an additional $50,000 from the Department of Energy and is currently in the running for a DOE carbon removal purchase prize of up to $3 million.
Charm’s process begins with woody biomass and an industrial chipper, after which the biomass is screened and dried. The chips are then rapidly heated in a low oxygen environment, a process called fast pyrolysis, which vaporizes the cellulose in the biomass. The remaining plant matter is then condensed into a liquid and injected thousands of feet underground.
Until now, the company has gotten more attention for its efforts to use agricultural biomass like corn stalks. But Reinhardt told me that lately, 100% of the company’s feedstock comes from “fuel load reduction projects,” — unhealthy trees that have been cut down — though in the future, it plans to source from both agricultural and forest waste. The change in feedstock prioritization, Reinhardt said, is due to wildfires becoming “a more and more urgent issue,” plus the advantages that come from working with denser materials. “Almost all the cost of biomass is in the logistics, and the cost of logistics is driven by density,” he said. Transporting puffy bales of corn stalks, leaves, and husks to Charm’s pyrolyzer is just not as energy efficient as trucking a log.
And because there are already plenty of piles of logs and residue sitting around in forests like Inyo, if Charm can bring its pyrolizers directly to the forest, it can increase efficiency still further. Bringing Charm’s operations onsite could eventually help the Forest Service save money, too. “The Eastern Sierra, it's pretty isolated for this industry,” Lonergan told me. “And so we are actually hauling that [biomass] to Carson City, which is three and a half hours away.”
Fixing the agency’s transportation woes is a ways away though — Charm is starting small, processing just 60 tons of biomass over six weeks of operation in Inyo. The pilot is already more than halfway over.
Charm won’t be claiming carbon removal credits for this project, as Reinhardt told me it’s more a “demonstration of the production” to make sure the logistics work out. Scaling up will mean deploying larger pyrolyzers that can process significantly more biomass. “Our next iteration of pyrolyzers will be probably 10x the throughput,” Reinhardt told me. “So instead of 1 or one-and-a-half tons a day, about 10 to 15 tons a day.” Those numbers start to sound pretty darn small, though, when you consider the amount of forestry biomass and agricultural residue generated per year, which Reinhardt said is around 50 million tons and 300 million tons, respectively.
And while this particular project comprises 538 acres of forest, California alone has set a goal of thinning 1 million acres per year to reduce wildfire risk. Basically, Charm’s not going to run out of feedstock anytime soon, and the Forest Service isn’t going to find a quick fix for its piles and piles of unwanted wood. “I don't envision it being the one solution that fits all,” Lonergan said of Charm’s technology. But, she told me, “it can absolutely contribute to these biomass materials that we don't have an answer for yet.”
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?”
