Carbon Capture: Direct Air Capture’s Cost Hurdle

The fight against climate change has moved beyond simply reducing emissions. Scientists and engineers are now building massive machines to remove carbon dioxide that is already in the atmosphere. The biggest test of this technology is currently under construction in the Texas desert. Occidental Petroleum is building the Stratos plant, a facility designed to prove that sucking carbon out of the sky can make financial sense.

The Stratos Project: A Titan in Texas

Occidental Petroleum, often referred to as Oxy, is taking a massive gamble in Ector County, Texas. This location in the Permian Basin is traditionally known for pumping oil out of the ground. Now, it is the site of “Stratos,” which aims to be the world’s largest Direct Air Capture (DAC) facility.

Once fully operational, Stratos is designed to capture 500,000 metric tons of carbon dioxide per year. To put that in perspective, the current largest operating DAC plant (Climeworks’ Mammoth in Iceland) has a capacity of roughly 36,000 tons per year. Stratos represents a massive leap in scale.

The facility relies on technology developed by Carbon Engineering, a Canadian firm that Oxy acquired for $1.1 billion in 2023. The process involves huge fans that pull air over liquid surfaces. These surfaces contain a chemical solution that binds to the CO2. Through a series of chemical reactions involving heating and cooling, the CO2 is extracted as a pure gas, ready to be buried underground.

The Economics: Breaking the Cost Barrier

The technology to capture carbon works. The problem is the price tag. Historically, capturing a ton of CO2 directly from the air has cost between $600 and $1,000. This is far too expensive for widespread global adoption.

For DAC to become a viable industry, experts and the Department of Energy suggest the cost needs to drop to roughly $100 per ton. Stratos is the industry’s attempt to force these costs down through economies of scale.

Why is it so expensive?

The primary cost driver is energy. The concentration of CO2 in the atmosphere is roughly 0.04%. Finding and capturing those sparse molecules requires moving massive amounts of air and using intense heat (often up to 900°C in the calcination phase) to release the captured carbon from the chemical solution so the solution can be reused.

Who is paying for it?

Building Stratos is an expensive endeavor with an estimated construction cost of around $1.3 billion. To manage this risk, Oxy has secured significant financial partners:

• BlackRock: In November 2023, BlackRock committed $550 million to the project through a joint venture. This influx of capital signaled that Wall Street sees potential profit in carbon removal.
• Corporate Buyers: Major corporations are pre-buying “carbon removal credits” to offset their own emissions. Amazon, TD Bank, and All Nippon Airways (ANA) have all signed deals to purchase removal credits from the Stratos plant. AT&T also agreed to purchase credits in a deal announced in 2024.

These companies are paying a premium now to help the technology mature. They are betting that regulatory pressure will eventually make carbon removal mandatory or that carbon credits will become a valuable global currency.

The Controversy: Enhanced Oil Recovery

Occidental Petroleum’s involvement in DAC draws skepticism from environmental groups. The controversy stems from what happens to the carbon after it is captured.

There are generally two paths for the captured CO2:

1. Sequestration: Injecting the gas deep into saline aquifers where it turns into stone over time. This permanently removes it from the atmosphere.
2. Enhanced Oil Recovery (EOR): Injecting the CO2 into aging oil fields to push stubborn oil to the surface.

Critics argue that using captured carbon to pump more oil defeats the purpose of the technology. Oxy CEO Vicki Hollub has previously described DAC as a way to preserve the oil industry’s social license to operate. The company argues that “net-zero oil” (oil produced where the emissions are offset by the injection of captured carbon) is a necessary bridge fuel.

However, for the Stratos project specifically, the focus has shifted heavily toward pure sequestration to qualify for high-value carbon credits and government incentives.

Government Support and Timeline

The United States government is heavily subsidizing this industry. The Inflation Reduction Act (IRA) increased the tax credit (known as 45Q) for permanently stored carbon captured from the air to $180 per ton. This subsidy is essential for the math behind Stratos to work.

Construction on Stratos is roughly 50% complete as of mid-2024. Oxy expects the plant to become commercially operational in mid-2025.

If Stratos succeeds, it serves as a blueprint. The Department of Energy has already selected Oxy to develop a massive “South Texas DAC Hub” near Corpus Christi, which could eventually scale up to remove millions of tons of CO2 annually. The success or failure of Stratos will determine if that future is financially possible.

Frequently Asked Questions

What is Direct Air Capture (DAC)? DAC is a technology that uses chemical reactions to pull carbon dioxide directly out of the atmosphere, unlike point-source capture which collects emissions directly from a smokestack.

How much CO2 will Stratos capture? The plant is designed to capture 500,000 metric tons of CO2 per year when fully operational.

How much does it cost to build Stratos? The estimated cost for the facility is approximately $1.3 billion.

When will the Stratos plant open? Occidental Petroleum expects the plant to begin commercial operations in mid-2025.

Is this different from planting trees? Yes. While trees naturally capture carbon, they require vast amounts of land and release the carbon back into the air if they burn or rot. DAC offers a permanent, measurable, and space-efficient way to lock carbon away geologically.