Cardinal Glass Opens a New Front in Float Glass CCS

Cardinal Glass Industries has committed to what it describes as the world's first carbon capture installation at a float glass manufacturing facility. Working with Italian technology firm K2-CO2, Cardinal plans to capture approximately 130,000 metric tons of CO2 per year at its Winlock, Washington, plant.

That is equivalent to the carbon sequestered by planting approximately 1.6 million trees and growing them for a decade, according to Cardinal Glass Industries. Operations are planned for Q1 2029. Purchase orders and deposits on critical long-lead equipment are already placed.

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Why Is Float Glass So Hard to Decarbonize?

Float glass sits in one of manufacturing's toughest decarbonization spots. The process must run continuously at extremely high temperatures. It also generates CO2 from two separate sources at the same time.

The first source is energy. Furnaces require intense heat to melt raw materials.

The second source is the raw materials themselves. Carbonates in the batch decompose during melting and release CO2 no matter what fuel powers the furnace. You cannot solve that second source with electrification or fuel switching alone.

That dual-source challenge explains why float glass has received far less CCS developer attention than cement, steel, refining, or power generation. K2-CO2's approach addresses both sources. Its Hot Potassium Carbonate process strips CO2 from flue gas. The system is engineered to draw all heating and cooling from the flue gas stream itself, without external heat input.

Cardinal and K2-CO2 have also jointly patented a system that enables use of additional gases from the resulting flue gas. That adds further value to the captured stream beyond the CO2 itself.

How Does the K2-CO2 System Work?

K2-CO2 is a carbon capture specialist based in Padova, Italy. The company focuses on high-volume industrial environments where conventional capture approaches are hard to integrate. Its core technology is the Hot Potassium Carbonate process. This is licensed from Giammarco Technologies, a Venice-based provider active since the 1950s with more than 400 HPC references worldwide.

The system absorbs CO2 from flue gas using a potassium carbonate solvent. The CO2-loaded solvent passes through a stripping column for separation. The solvent is then recirculated. The captured CO2-rich gas moves on for use or storage. Because the system draws its energy from the flue gas itself, it avoids the steam penalty that makes conventional amine-based capture expensive for industrial facilities.

Cardinal confirmed that controls and measurement instruments are being integrated into the operating facility to monitor system performance continuously. Cardinal has also achieved minor-source status for regulated emissions across much of its float glass network. That establishes an existing baseline of emissions discipline that the Winlock project builds on directly.

What Does Winlock Mean for the Glass Industry?

Cardinal describes Winlock as the first project in a broader roadmap. Once operating, Cardinal plans to use its performance data to evaluate deployment across additional float glass lines. That roadmap depends entirely on what Winlock proves at commercial scale. Bowie Neumayer, President of Cardinal Glass Industries, framed the stakes directly.

That replication argument is what separates Winlock from a simple demonstration project. The IEA has reported that more than half of new CCS projects expected to be operational by 2030 are now in hard-to-abate industrial sectors. Float glass had not been among them until now.

The global flat glass market spans dozens of large-scale float facilities in North America, Europe, and Asia. A verified capture rate of 130,000 metric tons of CO2 per year at one plant makes the technology available for evaluation everywhere else. That is the commercial prize Winlock is positioned to unlock.

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Can the Economics Work Without Federal Funding?

Cardinal confirmed that Winlock is not currently receiving government funding. That matters because it tests whether certain hard-to-abate industrial CCS investments can proceed on commercial and regulatory economics alone, without depending on federal grants.

Several factors could support the business case. The federal 45Q tax credit was maintained at up to $85 per metric ton for qualifying industrial point-source capture. It was preserved under the One Big Beautiful Bill Act, signed July 4, 2025. The credit is also transferable. That provision benefits first-of-kind projects by letting developers sell credits to investors who can use them.

Washington state's Cap-and-Invest program also creates direct financial pressure. The program requires large industrial emitters to hold allowances for their emissions. Reducing CO2 output at Winlock directly lowers Cardinal's compliance cost exposure.

In March 2026, Washington released a draft linkage agreement with the Western Climate Initiative. That agreement would connect the state's market with California and Quebec, potentially stabilizing and increasing allowance values over time.

Cardinal says it is exploring potential future markets for the captured CO2. Whether that means geologic carbon storage, utilization, or sale to third parties remains unconfirmed. That decision will affect both the project's climate accounting and its eligibility for the 45Q credit.

Potential Revenue or Value Driver	Status at Winlock	Notes
Federal 45Q tax credit (up to $85 per metric ton)	Not confirmed. Depends on CO2 disposition pathway.	Maximum theoretical value: approx. $11 million per year at 130,000 metric tons
Washington Cap-and-Invest avoided compliance cost	Applicable to covered industrial emitters in Washington state	Reduces direct carbon compliance cost for Cardinal FG at Winlock
Captured CO2 markets (utilization or geologic storage)	Under exploration (Cardinal Glass Industries, August 2026)	No pathway confirmed. Outcome affects 45Q eligibility and climate accounting.
Lower embodied carbon glass premium	Expected once system operates and performance is validated	Supports green building procurement and lower-embodied-carbon project specifications

What Is the Downstream Value for Building Products?

Cardinal points to a product benefit that extends beyond the captured CO2. Once the system operates and performance is validated, the reduction in Cardinal float glass embodied carbon should help customers meet lower-embodied-carbon building requirements.

This matters because embodied carbon in building materials is now an active focus of green building standards across North America. Glass is a significant component of modern building envelopes. Lower-embodied-carbon glass can contribute directly to LEED credits and whole-life-carbon requirements that architects and developers are increasingly specifying.

Cardinal's customer base includes OEM window and door manufacturers, builders, and design partners who are already navigating embodied carbon reporting. A verified reduction in Cardinal float glass embodied carbon would give those customers a measurable, documentable product advantage. The broader industrial CCS buildout has concentrated on cement, steel, refining, and chemicals. Float glass has been largely absent. Winlock is the first serious attempt to change that.

What Milestones Decide Whether Winlock Scales?

Cardinal expects to provide updates as installation, commissioning, and validation milestones are reached between now and Q1 2029. Three questions will largely determine whether the technology moves beyond a single facility.

Capture Performance

The 95% CO2 removal rate from targeted process streams is a design target. Real-world operation of a continuously running float glass furnace introduces variables that must be managed and verified over time. Consistent performance data from Winlock is what makes replication credible.

CO2 Disposition

Where the captured CO2 ultimately goes affects both the project's climate accounting and its economics. Cardinal is currently exploring options. A confirmed pathway before or shortly after commissioning would significantly clarify the business case for future installations.

Replication Cost

The engineering, integration, and controls work developed for Winlock will directly shape the cost of deploying the same system at a second or third facility. Repeatable installation costs are what converts a first-of-kind project into an industry model.

Alessandro Monteforte, CEO of K2-CO2, stated what the two companies are trying to demonstrate.

The U.S. carbon capture sector now includes more than 270 publicly announced projects representing $77.5 billion in capital investment (2025). Almost none of that investment targets glass manufacturing. Winlock's planned 130,000 metric tons of annual capture is not large by the standards of major industrial CCS projects. But scale is not the point.

The test is whether this first-of-kind installation can generate the operating evidence needed to convert a single retrofit into a repeatable model. It would be the first time hard-to-abate manufacturing beyond the usual four sectors gets a proven CCS template to follow.

The core question is not simply whether Cardinal can capture 130,000 metric tons of CO2 annually at one Washington plant. It is whether the performance data from Winlock are strong enough to convert a first installation into a repeatable model for float glass globally. Everything between now and Q1 2029 will contribute to that answer.

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