carbon capture
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Heimdal pulls CO2 and cement-making materials out of seawater using renewable energy
One of the consequences of rising CO2 levels in our atmosphere is that levels also rise proportionately in the ocean, harming wildlife and changing ecosystems. Heimdal is a startup working to pull that CO2 back out at scale using renewable energy and producing carbon-negative industrial materials, including limestone for making concrete, in the process, and it has attracted significant funding even at its very early stage.
If the concrete aspect seems like a bit of a non sequitur, consider two facts: concrete manufacturing is estimated to produce as much as 8% OF all greenhouse gas emissions, and seawater is full of minerals used to make it. You probably wouldn’t make this connection unless you were in some related industry or discipline, but Heimdal founders Erik Millar and Marcus Lima did while they were working in their respective masters programs at Oxford. “We came out and did this straight away,” he said.
They both firmly believe that climate change is an existential threat to humanity, but were disappointed at the lack of permanent solutions to its many and various consequences across the globe. Carbon capture, Millar noted, is frequently a circular process, meaning it is captured only to be used and emitted again. Better than producing new carbons, sure, but why aren’t there more ways to permanently take them out of the ecosystem?
The two founders envisioned a new linear process that takes nothing but electricity and CO2-heavy seawater and produces useful materials that permanently sequester the gas. Of course, if it was as easy that, everyone would already be doing it.
Image Credits: Heimdal
“The carbon markets to make this economically viable have only just been formed,” said Millar. And the cost of energy has dropped through the floor as huge solar and wind installations have overturned decades-old power economies. With carbon credits (the market for which I will not be exploring, but suffice it to say it is an enabler) and cheap power come new business models, and Heimdal’s is one of them.
The Heimdal process, which has been demonstrated at lab scale (think terrariums instead of thousand-gallon tanks), is roughly as follows. First the seawater is alkalinized, shifting its pH up and allowing the isolation of some gaseous hydrogen, chlorine and a hydroxide sorbent. This is mixed with a separate stream of seawater, causing the precipitation of calcium, magnesium and sodium minerals and reducing the saturation of CO2 in the water — allowing it to absorb more from the atmosphere when it is returned to the sea. (I was shown an image of the small-scale prototype facility but, citing pending patents, Heimdal declined to provide the photo for publication.)
Image Credits: Heimdal
So from seawater and electricity, they produce hydrogen and chlorine gas, calcium carbonate, sodium carbonate and magnesium carbonate, and in the process sequester a great deal of dissolved CO2.
For every kiloton of seawater, one ton of CO2 is isolated, and two tons of the carbonates, each of which has an industrial use. MgCO3 and Na2CO3 are used in, among other things, glass manufacturing, but it’s CaCO3, or limestone, that has the biggest potential impact.
As a major component of the cement-making process, limestone is always in great demand. But current methods for supplying it are huge sources of atmospheric carbon. All over the world industries are investing in carbon reduction strategies, and while purely financial offsets are common, moving forward the preferred alternative will likely be actually carbon-negative processes.
To further stack the deck in its favor, Heimdal is looking to work with desalination plants, which are common around the world where fresh water is scarce but seawater and energy are abundant, for example the coasts of California and Texas in the U.S., and many other areas globally, but especially where deserts meet the sea, like in the MENA region.
Desalination produces fresh water and proportionately saltier brine, which generally has to be treated, as to simply pour it back into the ocean can throw the local ecosystem out of balance. But what if there were, say, a mineral-collecting process between the plant and the sea? Heimdal gets the benefit of more minerals per ton of water, and the desalination plant has an effective way of handling its salty byproduct.
“Heimdal’s ability to use brine effluent to produce carbon-neutral cement solves two problems at once,” said Yishan Wong, former Reddit CEO, now CEO of Terraformation and individually an investor in Heimdal. “It creates a scalable source of carbon-neutral cement, and converts the brine effluent of desalination into a useful economic product. Being able to scale this together is game-changing on multiple levels.”
Terraformation is a big proponent of solar desalination, and Heimdal fits right into that equation; the two are working on an official partnership that should be announced shortly. Meanwhile a carbon-negative source for limestone is something cement makers will buy every gram of in their efforts to decarbonize.
Wong points out that the primary cost of Heimdal’s business, beyond the initial ones of buying tanks, pumps and so on, is that of solar energy. That’s been trending downwards for years and with huge sums being invested regularly there’s no reason to think that the cost won’t continue to drop. And profit per ton of CO2 captured — already around 75% of over $500-$600 in revenue — could also grow with scale and efficiency.
Millar said that the price of their limestone is, when government incentives and subsidies are included, already at price parity with industry norms. But as energy costs drop and scales rise, the ratio will grow more attractive. It’s also nice that their product is indistinguishable from “natural” limestone. “We don’t require any retrofitting for the concrete providers — they just buy our synthetic calcium carbonate rather than buy it from mining companies,” he explained.
All in all it seems to make for a promising investment, and though Heimdal has not yet made its public debut (that would be forthcoming at Y Combinator’s Summer 2021 Demo Day) it has attracted a $6.4 million seed round. The participating investors are Liquid2 Ventures, Apollo Projects, Soma Capital, Marc Benioff, Broom Ventures, Metaplanet, Cathexis Ventures and, as mentioned above, Yishan Wong.
Heimdal has already signed LOIs with several large cement and glass manufacturers, and is planning its first pilot facility at a U.S. desalination plant. After providing test products to its partners on the scale of tens of tons, they plan to enter commercial production in 2023.
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44.01 secures $5M to turn billions of tons of carbon dioxide to stone
Reducing global greenhouse gas emissions is an important goal, but another challenge awaits: lowering the levels of CO2 and other substances already in the atmosphere. One promising approach turns the gas into an ordinary mineral through entirely natural processes; 44.01 hopes to perform this process at scale using vast deposits of precursor materials and a $5 million seed round to get the ball rolling.
The process of mineralizing CO2 is well known among geologists and climate scientists. A naturally occurring stone called peridotite reacts with the gas and water to produce calcite, another common and harmless mineral. In fact this has occurred at enormous scales throughout history, as witnessed by large streaks of calcite piercing peridotite deposits.
Peridotite is normally found miles below sea level, but on the easternmost tip of the Arabian peninsula, specifically the northern coast of Oman, tectonic action has raised hundreds of square miles of the stuff to the surface.
Talal Hasan was working in Oman’s sovereign investment arm when he read about the country’s coast having the largest “dead zone” in the world, a major contributor to which was CO2 emissions being absorbed by the sea and gathering there. Hasan, born into a family of environmentalists, looked into it and found that, amazingly, the problem and the solution were literally right next to each other: the country’s mountains of peridotite, which theoretically could hold billions of tons of CO2.
Around that time, in fact, The New York Times ran a photo essay about Oman’s potential miracle mineral, highlighting the research of Peter Kelemen and Juerg Matter into its potential. As the Times’ Henry Fountain wrote at the time:
If this natural process, called carbon mineralization, could be harnessed, accelerated and applied inexpensively on a huge scale — admittedly some very big “ifs” — it could help fight climate change.
That’s broadly speaking the plan proposed by Hasan and, actually, both Kelemen and Matter, who make up the startup’s “scientific committee.” 44.01 (the molecular weight of carbon dioxide, if you were wondering) aims to accomplish mineralization economically and safely with a few novel ideas.
First is the basic process of accelerating the natural reaction of the materials. It normally occurs over years as CO2 and water vapor interact with the rock — no energy needs to be applied to make the change, since the reaction actually results in a lower energy state.
“We’re speeding it up by injecting a higher CO2 content than you would get in the atmosphere,” said Hasan. “We have to drill an engineered borehole that’s targeted for mineralization and injection.”
Image Credits: 44.01
The holes would maximize surface area, and highly carbonated water would be pumped in cyclically until the drilled peridotite is saturated. Importantly, there’s no catalyst or toxic additive, it’s just fizzy water, and if some were to leak or escape, it’s just a puff of CO2, like what you get when you open a bottle of soda.
Second is achieving this without negating the entire endeavor by having giant trucks and heavy machinery pumping out new CO2 as fast as they can pump in the old stuff. To that end Hasan said the company is working hard at the logistics side to create a biodiesel-based supply line (with Wakud) to truck in the raw material and power the machines at night, while solar would offset that fuel cost at night.
It sounds like a lot to build up, but Hasan points out that a lot of this is already done by the oil industry, which as you might guess is fairly ubiquitous in the region. “It’s similar to how they drill and explore, so there’s a lot of existing infrastructure for this,” he said, “but rather than pulling the hydrocarbon out, we’re pumping it back in.” Other mineralization efforts have broken ground on the concept, so to speak, such as a basalt-injection scheme up in Iceland, so it isn’t without precedent.
Third is sourcing the CO2 itself. The atmosphere is full of it, sure, but it’s not trivial to capture and compress enough to mineralize at industrial scales. So 44.01 is partnering with Climeworks and other carbon capture companies to provide an end point for their CO2 sequestration efforts.
Plenty of companies are working on direct capture of emissions, be they at the point of emission or elsewhere, but once they have a couple million tons of CO2, it’s not obvious what to do next. “We want to facilitate carbon capture companies, so we’re building the CO2 sinks here and operating a plug and play model. They come to our site, plug in, and using power on site, we can start taking it,” said Hasan.
How it would be paid for is a bit of an open question in the exact particulars, but what’s clear is a global corporate appetite for carbon offsetting. There’s a large voluntary market for carbon credits beyond the traditional and rather outdated carbon credits. 44.01 can sell large quantities of verified carbon removal, which is a step up from temporary sequestration or capture — though the financial instruments to do so are still being worked out. (DroneSeed is another company offering a service beyond offsets that hopes to take advantage of a new generation of emissions futures and other systems. It’s an evolving and highly complex overlapping area of international regulations, taxes and corporate policy.)
For now, however, the goal is simply to prove that the system works as expected at the scales hoped for. The seed money is nowhere near what would be needed to build the operation necessary, just a step in that direction to get the permits, studies and equipment necessary to properly perform demonstrations.
“We tried to get like-minded investors on board, people genuinely doing this for climate change,” said Hasan. “It makes things a lot easier on us when we’re measured on impact rather than financials.” (No doubt all startups hope for such understanding backers.)
Apollo Projects, a early-stage investment fund from Max and Sam Altman, led the round, and Breakthrough Energy Ventures participated. (Not listed in the press release but important to note, Hasan said, were small investments from families in Oman and environmental organizations in Europe.)
Oman may be the starting point, but Hasan hinted that another location would host the first commercial operations. While he declined to be specific, one glance at a map shows that the peridotite deposits spill over the northern border of Oman and into the eastern tip of the UAE, which no doubt is also interested in this budding industry and, of course, has more than enough money to finance it. We’ll know more once 44.01 completes its pilot work.
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Holy Grail raises $2.7M seed fund to create modular carbon capture devices
The founders of Holy Grail, a two-year-old startup based in Mountain View, California, are taking a micro approach to solving the outsized problem of capturing carbon.
The startup is prototyping a direct air carbon capture device that is modular and small — a departure from the dozens of projects in the U.S. and abroad that aim to capture CO2 from large, centralized emitters, like power plants or industrial facilities. Holy Grail co-founder Nuno Pereira told TechCrunch that this approach will reduce costs and eliminate the need for permits or project financing.
While Holy Grail has a long development and testing phase ahead, the idea has captured the attention and capital from well-known investors and Silicon Valley founders. Holy Grail recently raised $2.7 million in seed funding from LowerCarbon Capital, Goat Capital, Stripe founder Patrick Collison, Charlie Songhurst, Cruise co-founder Kyle Vogt, Songkick co-founder Ian Hogarth, Starlight Ventures and 35 Ventures. Existing investors Deep Science Ventures, Y Combinator and Oliver Cameron, who co-founded Voyage, the autonomous vehicle acquired by Cruise, also participated.
The carbon capture device is still in the prototype stage, Pereira said, with many specifics — such as the anticipated size of the end product and how long it will likely function — still to be worked out. Cost-effectively separating CO2 from the air is an extremely difficult problem to solve. The company is in the process of filing patents for the technology, so he declined to be too specific about many characteristics of the device, including what it will be made out of. But he did stress that the company is taking a fundamentally different technical approach to carbon capture.
“The current technologies, they are very complex. They are basically either [using] temperature or pressure [to capture carbon],” he said. “There is a lot of things that go into it, compressors, calciners and all these things,” referring to additional parts like mechanical pumps, cryogenic air separators and large quantities of water and energy. Pereira said the company will instead use electricity to control a chemical reaction that binds to the CO2. He added that Holy Grail’s devices are not dependent on scale to achieve cost reductions, either. And they will be modular, so they can be stacked or configured depending on a customer’s requirements.
The scrubbers, as Pereira calls them, will focus on raw capture of CO2 rather than conversion (converting the CO2 into fuels, for example). Pereira instead explained — with a heavy caveat that much about the end product still needs to be figured out — that once a Holy Grail unit is full, it could be collected by the company, though where the carbon will end up is still an open question.
The company will start by selling carbon credits, using its devices as the carbon reducing project. The end goal is selling the scrubbers to commercial customers and eventually even individual consumers. That’s right: Holy Grail wants you to have your own carbon capture device, possibly even right in your backyard. But the company still likely has a long road ahead of it.
“We’re essentially shifting the scaling factor from building a very large mega-ton plant and having the project management and all that stuff to building scrubbers in an assembly line, like a consumer product to be manufactured.”
Pereira said many approaches will be needed to tackle the mammoth problem of reducing the amount of CO2 in the atmosphere. “The problem is just too big,” he said.
The story has been updated to reflect that Holy Grail is based in Mountain View, not Cupertino.
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EU and Bill Gates make joint push for $1BN to accelerate clean tech
The European Commission has announced a partnership with Bill Gates’ sustainable energy funding vehicle with the goal of unlocking new investments for clean tech and sustainable energy projects totaling up to $1 billion (€820 million) over five years (2022-2026).
EU-based projects the partnership will initially focus on four sectors that are being prioritized for their potential to deliver substantial reductions in regional emissions — namely:
- Green hydrogen.
- Sustainable aviation fuels.
- Direct air capture.
- Long-duration energy storage.
The goal is to scale technologies that are currently too expensive to compete with fossil-fuel-based incumbent technologies.
The pair said they will continue to work on setting up the program over the coming months, with an eye on having something further to announce at the COP-26 conference in November.
It’s not the first time the commission and Gates’ Breakthrough Energy organization have worked together on funding sustainable investment. But the scale of this latest partnership dwarfs the €100 million fund the EU established back in 2019 with its venture investment funding arm.
Now the commission has partnered with Breakthrough Energy Catalyst — a financing program within Gates’ organization that aims to accelerate the development and adoption of technologies needed to underpin a low-carbon economy — to mobilize up to 10x more than the earlier fund to build large-scale, commercial demonstration projects for clean technologies.
The overarching goal is of course to lower the costs and accelerate deployment of clean tech in order to deliver significant reductions in CO2 emissions in line with the Paris Agreement.
The bloc is a major emitter of CO2 but has committed to achieving net-zero emissions by 2050, under the European Green Deal.
Gates’ philosophy with his 2015-founded Breakthrough Energy vehicle, meanwhile, is that renewables alone won’t be enough to avert catastrophic climate change — and investments in a range of high risk but potentially high reward technologies is also needed.
But given the lengthy time scales needed for a return on these types of investments, public-private partnerships look like a key piece of the financing puzzle.
Commenting on the partnership announcement in a statement, EU president Ursula von der Leyen, said: “With our European Green Deal, Europe wants to become the first climate-neutral continent by 2050. … Europe has also the great opportunity to become the continent of climate innovation. For this, the European Commission will mobilise massive investments in new and transforming industries over the next decade. This is why I’m glad to join forces with Breakthrough Energy. Our partnership will support EU businesses and innovators to reap the benefits of emission-reducing technologies and create the jobs of tomorrow.”
In another supporting statement, Gates, founder of Breakthrough Energy, added: “Decarbonising the global economy is the greatest opportunity for innovation the world has ever seen. Europe will play a critical role, having demonstrated an early and consistent commitment to climate and longstanding leadership in science, engineering, and technology. Through this partnership, Europe will lay solid ground for a net-zero future in which clean technologies are reliable, available, and affordable for all.”
On the EU side, funding for the partnership is expected to come from the bloc’s flagship R&D fund, Horizon Europe, and also via the low-carbon-focused Innovation Fund within the framework of the InvestEU program.
Breakthrough Energy Catalyst will mobilise equivalent private capital and philanthropic funds to finance selected projects.
The partnership will also be open to national investments by EU Member States through InvestEU or at project level, the commission noted. It added that a call for expressions of interest for potential InvestEU implementing partners is currently open until June 30, 2021.
Renewable energy and clean(er) transport were also key focus areas for the massive €750 billion “Next Generation EU” coronavirus recovery fund put together by the commission last year — which said it would borrow money on the financial markets through the issuance of bonds for post-pandemic recovery — with that money pegged to be channelled through EU programs between 2021 and 2024.
The bloc’s lawmakers have also suggested that digitization and AI technologies — which are other areas it’s pegged for major investment — will play a key supporting role in Europe’s green transition.
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Scalable, low-cost technologies needed to repair climate, Cambridge professor suggests
Cambridge University has proposed setting up a research center tasked with coming up with scalable technological fixes for climate change.
The proposed Center for Climate Repair is being coordinated by David King, an emeritus professor in physical chemistry at the university and also the U.K. government’s former chief scientific adviser.
Speaking to the BBC this morning, King suggested the scale of the challenge now facing humanity to end greenhouse gas emissions is so pressing that radical options need to be considered and developed alongside efforts to shift societies to carbon neutral and shrink day to day emissions.
“What we do over the next 10 years will determine the future of humanity for the next 10,000 years. There is no major centre in the world that would be focused on this one big issue,” he told BBC News.
In an interview on the BBC Radio 4’s “Today” program, King said the center would need to focus on scalable, low-cost technologies that could be deployed to move the needle on the climate challenge.
Suggested ideas it could work to develop include geoengineering initiatives, such as spraying sea water into the air at the north and south poles to reflect sunlight away and refreeze them; using fertilizer to regreen portions of the deep ocean to promote plankton growth; and carbon capture and storage methods to suck up and sequester greenhouse gases so they can’t contribute to accelerating global warming.
On the issue of nuclear power, King said interesting work is being done to try to develop viable nuclear fusion technology — but also pointed to untapped capacity in renewable energy technologies, arguing there is an “ability to develop renewables far more than we thought before.”
If established, the Center for Climate Repair, would be attached to the university’s new Cambridge Carbon Neutral Futures Initiative, which is a research hub recently set up to link climate-related research work across the university — and “catalyse holistic, collaborative progress towards a sustainable future”, as it puts it.
“If [the Center for Climate Repair] goes forward, it will be part of the Carbon Neutral Futures Initiative, which is led by Dr Emily Shuckburgh,” a spokeswoman for the university confirmed.
“When considering how to tackle a problem as large, complex and urgent as climate change, we need to look at the widest possible range of ideas and to investigate radical innovations such as those proposed by Sir David,” said Shuckburgh, commenting on the proposal in a statement.
“In assessing such ideas we need to explore all aspects, including the technological advances required, the potential unintended consequences and side effects, the costs, the rules and regulations that would be needed, as well as the public acceptability.”
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