Carbon Capture Technology: How DAC Works in 2026

Direct Air Capture (DAC) has moved from speculative science to deployable climate infrastructure. In 2026, there are over a dozen commercial-scale DAC plants operating worldwide, with combined capacity exceeding 5 million tonnes of CO2 removed per year. This article breaks down how the technology works, who is leading the field, what it costs, and why it has become indispensable to credible net-zero strategies.

What Is Direct Air Capture?

Direct Air Capture is a technology that extracts carbon dioxide directly from ambient air. Unlike point-source carbon capture, which intercepts CO2 from smokestacks or industrial flues, DAC can be placed anywhere. The atmosphere is thoroughly mixed, so a DAC plant in Iceland removes the same CO2 molecule as one in Texas would. This geographic flexibility is one of the technology's greatest advantages.

The core challenge is concentration. Ambient air contains roughly 420 parts per million of CO2, meaning a DAC plant must process enormous volumes of air to capture meaningful quantities of carbon. A single facility might move tens of thousands of cubic meters of air per minute through its capture system. Engineering this efficiently, without consuming more energy than the capture saves, is the central technical problem.

How DAC Works: The Two Leading Approaches

1. Liquid Solvent Systems

The first approach uses liquid chemical solvents, typically potassium hydroxide solutions. Air is drawn through a contactor where the solvent absorbs CO2, forming potassium carbonate. This solution is then processed in a series of chemical steps to release concentrated CO2 and regenerate the solvent. The released CO2 is compressed for storage or utilization. Carbon Engineering, now owned by Occidental Petroleum, pioneered this approach at scale. Their Permian Basin facility in Texas became operational in 2024 and removes up to 500,000 tonnes of CO2 per year.

2. Solid Sorbent Systems

The second approach uses solid sorbent materials, typically amine-functionalized filters or metal-organic frameworks. Air passes through a filter that selectively binds CO2. Once saturated, the filter is heated under vacuum to release the CO2. Climeworks, based in Switzerland, is the best-known company using this method. Their Mammoth facility in Iceland, operational since 2024, captures 36,000 tonnes annually and uses geothermal energy for the regeneration cycle, making it nearly carbon-neutral in operation.

Both approaches share a basic architecture: capture, release, and regeneration. The differences lie in the chemistry, energy requirements, and scalability. Solid sorbent systems tend to be more modular and easier to deploy in smaller batches, while liquid solvent systems benefit from economies of scale at larger installations.

The DAC Plant Pipeline in 2026

The global DAC fleet has grown significantly since 2024. Here are the most notable projects:

• Mammoth (Iceland) - Climeworks: 36,000 tonnes/year, powered by geothermal energy. CO2 is mineralized in basalt formations through the Carbfix process.
• STRatos (Texas) - Carbon Engineering/Occidental: 500,000 tonnes/year, the world's largest DAC facility. CO2 is sequestered in saline aquifers.
• South Texas DAC Hub - 1PointFive: Under construction, targeting 1 million tonnes/year capacity by 2027.
• Benguerir (Morocco) - Climeworks: 8,000 tonnes/year pilot using solar thermal energy for regeneration.
• Demonstration Plant (Bihar, India) - Carbon Clean: 10,000 tonnes/year, exploring low-cost sorbent chemistry.

The United States Department of Energy has committed $3.5 billion to DAC hub development across four regional centers in Texas, Louisiana, North Dakota, and Wyoming. These hubs aim to reach combined capacity of 5 million tonnes annually by 2030.

Energy Requirements and Costs

DAC is energy-intensive. Capturing one tonne of CO2 requires between 1,500 and 2,500 kilowatt-hours of energy, depending on the technology. This is why plant siting matters enormously. Facilities powered by renewables or waste heat have a far better carbon footprint than those drawing from fossil-heavy grids.

Costs have declined meaningfully. In 2022, DAC cost approximately $600-1,000 per tonne. By 2026, the leading operators report costs of $250-400 per tonne at scale. The Department of Energy's Carbon Shot initiative targets $100 per tonne by 2032, a goal that most industry analysts now consider achievable but ambitious.

The 45Q tax credit in the United States provides up to $180 per tonne for DAC with permanent sequestration, making the economics viable for commercial operators. The European Union's Innovation Fund has similarly supported DAC deployment, contributing over EUR 500 million to pilot and demonstration projects.

Carbon Storage: Where Does the CO2 Go?

Capturing CO2 is only half the equation. The captured carbon must be permanently stored or productively used. Three pathways dominate:

1. Geological Sequestration: CO2 is injected into deep saline aquifers or depleted oil fields. The Carbfix method in Iceland dissolves CO2 in water and injects it into basalt, where it mineralizes into solid carbonate within two years. This approach is the gold standard for permanence.
2. Mineralization: CO2 reacts with crushed basalt or peridotite to form stable carbonates. This is slower but can be done at scale using mine tailings or coastal olivine sands.
3. Utilization: CO2 is converted into synthetic fuels, building materials, or chemical feedstocks. While technically carbon recycling rather than removal, utilization creates economic incentives for capture.

Why DAC Matters for Net-Zero

The Intergovernmental Panel on Climate Change has been clear: limiting warming to 1.5 degrees requires not just aggressive emission reductions but also active carbon removal. DAC is one of the few technologies that can address hard-to-abate sectors like aviation, agriculture, and cement production. The IPCC estimates that carbon removal, including DAC, must scale to 5-10 billion tonnes per year by mid-century.

Critics argue that DAC could distract from emission reduction efforts. This concern is valid. DAC is a complement to decarbonization, not a replacement. Every credible climate model treats it as a bridge for residual emissions that cannot be eliminated through electrification or efficiency improvements.

The Path Forward

DAC technology in 2026 stands at an inflection point. The science is proven, costs are falling, and policy support is strong. The remaining challenges are scale and speed. Building a DAC facility takes 2-3 years, and the supply chain for sorbents, compressors, and geological storage sites must expand dramatically.

For companies developing net-zero strategies, DAC offers a measurable, verifiable form of carbon removal. Unlike forest-based offsets, which can burn or degrade, geological sequestration is permanent. As carbon markets mature and corporate climate disclosures tighten, demand for high-quality removal credits will only grow.