Frontier bets $58.3M on carbon removal startup Vaulted Deep

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May 1

Squat metal wellheads rise from a grassy field in central Kansas, surrounded by red steel containers. Years ago, oil and gas companies came here to deposit their liquid waste into the teardrop-shaped salt caverns hundreds of feet below the surface.

Now, a company with a wholly different mission is filling those same impermeable caverns with other kinds of waste material.

Vaulted Deep recently began injecting slurry made from the organic residues of nearby landfills, feedlots, wastewater treatment facilities, and paper mills. This biomass is rich in carbon — and Vaulted is working to keep it from returning to the atmosphere as carbon dioxide by trapping it underground.

Last week, the Houston-based startup announced it had removed more than 2,000 metric tons of CO₂ during its first four months of operations in Hutchinson, Kansas. The Frontier coalition — a carbon-removal fund whose members include Stripe, Shopify, and Alphabet — purchased credits in advance to help launch this first commercial-scale run.

On Wednesday, the two organizations said they're ready to significantly scale up their arrangement.

Frontier's members agreed to pay Vaulted $58.3 million to remove 152,480 metric tons of CO₂ between 2024 and 2027. While that doesn't come remotely close to undoing the damage caused by burning fossil fuels, it's not a trivial amount of CO₂ either. The amount Vaulted aims to remove is equal to roughly 40 percent of the annual emissions from a single U.S. gas-fired power plant.

The offtake agreement is the most lucrative that Frontier has signed since it launched in April 2022. Last year, the coalition struck similar deals with the companies Charm Industrial, which makes "bio-oil" from crop waste, and Lithos Carbon, which uses crushed rocks to sequester CO₂. Frontier's members aim to spend nearly $1 billion on permanent carbon removals by 2030.

"We're really excited about Vaulted's ability to deliver at scale in the near term," Hannah Bebbington, the strategy lead at Frontier, told Canary Media.

"Not only is that great from a climate perspective," she added, "but that type of tangible, concrete delivery is what enables investors to come in. It gets other entrepreneurs excited about doing carbon removal, and it generates more momentum in the market overall."

An illustration depicts Vaulted's method of removing CO2 via underground injection of waste biomass. (Vaulted Deep/Frontier)

Vaulted, which launched in September 2023, is a relative newcomer in the fast-growing field of carbon dioxide removal, though its core technology is already being deployed at commercial scale for industrial waste operations nationwide.

The startup is a spin-off of Advantek Waste Management Services, a company that helped to pioneer the use of deep disposal wells for particularly problematic types of waste, including oil field slurry and discharges from wastewater treatment plants. The U.S. Environmental Protection Agency regulates and issues permits for the wells, which can range between 3,000 and 7,500 feet deep — far beneath the zone where groundwater is found.

Vaulted is now using Advantek's know-how on injection techniques, federal permitting, and environmental safety to inject carbon-laden liquid into the ground in Kansas, as well as at an existing Advantek operation in Los Angeles.

"It's not that we just invented this and now we're off to the races," said Omar Abou-Sayed, who co-founded Vaulted and is the executive chairman and former CEO of Advantek. "We can move fast because we spent decades creating the through-line to get to this starting position."

The fuzzy, complicated math of biomass

Vaulted is just one of the hundreds of companies worldwide developing novel ways of removing planet-warming gases from the sky, including by running giant air filters, baking trays of limestone, and storing CO₂ in seawater.

Climate scientists agree that at least some carbon removal is necessary to achieve net-zero emissions by 2050 — in addition to phasing out fossil fuels and drastically reducing greenhouse gas emissions. In the United States, experts say, at least 1 gigaton of carbon-removal capacity will be needed to decarbonize the economy by mid-century. That's equal to roughly 20 percent of the country's total CO₂ emissions in 2023.

Vaulted is also among the growing subset of startups that are looking to biomass waste — organic residues from plants and animals — to draw carbon dioxide from the atmosphere. Charm Industrial uses a "fast pyrolysis" process to turn cornstalks and leaves into a viscous, carbon-rich oil that it injects deep underground. Graphyte takes rice and timber scraps, packs them into polymer-sealed bricks, and buries them in a pit.