Achieving net-zero emissions isn't simply about replacing fossil fuels with renewable energy.
While renewable energy, electrification, and energy efficiency can significantly reduce emissions, some industries produce carbon dioxide (CO₂) as an unavoidable part of their manufacturing processes. These sectors, often called hard-to-abate industries, require additional solutions to reduce their climate impact.
This is where Carbon Capture and Utilization (CCU) plays an important role.
What is Carbon Capture and Utilization (CCU)?
Carbon Capture and Utilization (CCU) refers to a group of technologies that capture carbon dioxide before it is released into the atmosphere and use it as a raw material to manufacture other products.
The captured CO₂ can come from various sources, including:
Cement plants
Steel manufacturing facilities
Chemical production plants
Power generation facilities
Hydrogen production
Direct Air Capture (DAC) systems
Instead of treating carbon dioxide solely as waste, CCU views it as a valuable industrial feedstock that can be transformed into products such as:
Synthetic fuels
Methanol
Chemicals
Concrete and building materials
Plastics and polymers
Industrial gases
Depending on the application, the captured carbon may remain stored for years or even decades. In other cases, such as synthetic fuels, the carbon is eventually released back into the atmosphere when the fuel is used. As a result, the climate benefits of CCU vary depending on the end use of the captured CO₂.
According to the International Energy Agency (IEA), carbon capture technologies are among the few scalable solutions currently available to reduce emissions in sectors where deep decarbonization remains technically challenging.
CCS vs. CCU vs. CCUS: What's the Difference?
The terms CCS, CCU, and CCUS are often used interchangeably, but they describe different approaches to managing carbon dioxide.
Technology | What Happens to the Captured CO₂? | Primary Objective |
CCS (Carbon Capture and Storage) | Captured CO₂ is permanently stored in deep geological formations. | Long-term carbon storage |
CCU (Carbon Capture and Utilization) | Captured CO₂ is converted into useful products such as fuels, chemicals, or construction materials. | Product creation and emissions reduction |
CCUS (Carbon Capture, Utilization, and Storage) | Combines utilization and permanent storage depending on the project. | Flexible carbon management |
Although these technologies are closely related, they serve different purposes.
CCS focuses on permanently storing captured carbon underground to prevent it from entering the atmosphere. CCU, on the other hand, seeks to create value from captured carbon by using it as a feedstock for industrial applications.
CCUS is an umbrella term that includes both approaches.
It's also important to distinguish these technologies from carbon sequestration.
Carbon sequestration specifically refers to the long-term storage of carbon, either naturally through forests, soils, and oceans or through engineered geological storage. Since many CCU applications eventually release the captured carbon back into the atmosphere, not every CCU project qualifies as carbon sequestration.
Why Carbon Capture Matters?
Over the past decade, renewable energy has become one of the fastest-growing sources of electricity worldwide.
However, not all emissions come from electricity generation.
Industries such as cement, steel, chemicals, refining, and fertilizer production generate process emissions, which occur as part of chemical reactions during manufacturing. These emissions cannot always be eliminated by switching to renewable electricity alone.
For example, cement production releases CO₂ when limestone is heated to produce clinker, a key ingredient in cement. Even if the kiln is powered entirely by renewable energy, these process emissions still occur.
Carbon capture technologies address this challenge by capturing carbon dioxide before it reaches the atmosphere.
According to the IEA's Net Zero by 2050 Roadmap, carbon capture will play a critical role in reducing emissions from these hard-to-abate sectors while supporting the transition to a net-zero economy.
A Brief Evolution of Carbon Capture Technologies
Carbon capture is often viewed as an emerging technology, but its origins go back several decades.
Large-scale CO₂ capture has been used since the 1970s, initially in natural gas processing and later in Enhanced Oil Recovery (EOR), where captured carbon dioxide is injected into mature oil fields to improve extraction efficiency.
Over time, the purpose of carbon capture has evolved significantly.
What began as an industrial process for improving oil production is now increasingly recognized as a climate solution capable of reducing emissions across multiple industries.
Today, governments, research institutions, and private companies are investing billions of dollars into developing more efficient carbon capture technologies, lowering costs, and expanding commercial deployment.
Current State of Carbon Capture Deployment
Carbon capture is gaining momentum around the world, although widespread deployment is still in its early stages.
According to the Global CCS Institute, dozens of commercial-scale carbon capture facilities are already operating worldwide, while hundreds of additional projects are under development across various sectors.
Governments in North America, Europe, Asia-Pacific, and the Middle East are introducing new funding programs and policy incentives to accelerate deployment, reflecting the growing recognition that carbon capture will be essential to achieving long-term climate goals.
How Carbon Capture and Utilization Works
Although different technologies are used depending on the industry, most CCU systems follow three key stages.
1. Carbon Capture
The first step involves separating carbon dioxide from industrial exhaust gases or directly from the atmosphere.
Common capture sources include:
Cement plants
Steel mills
Chemical manufacturing facilities
Power plants
Direct Air Capture (DAC) facilities
Several capture technologies are used today, including chemical absorption, adsorption, membrane separation, and cryogenic processes. The choice depends on factors such as the concentration of CO₂, energy requirements, and project economics.
2. Carbon Utilization
Once captured, carbon dioxide can be purified and used as a feedstock for manufacturing various products.
Common applications include:
Sustainable aviation fuels
Synthetic fuels
Methanol
Urea production
Carbonated beverages
Concrete curing
Building materials
Specialty chemicals
The environmental benefit of these applications depends largely on how long the carbon remains stored within the final product.
For example, CO₂ incorporated into concrete may remain locked away for decades, whereas CO₂ used to produce synthetic fuels is eventually released when the fuel is burned.
3. Storage (When Utilization Isn't Suitable)
Not all captured carbon can be economically utilized.
In such cases, carbon dioxide can be compressed, transported, and injected into deep geological formations for permanent storage.
This approach forms the foundation of Carbon Capture and Storage (CCS) and is considered one of the most effective methods for preventing captured CO₂ from re-entering the atmosphere.
Direct Air Capture (DAC): Removing CO₂ from the Atmosphere
Most carbon capture projects remove carbon dioxide directly from industrial facilities before it reaches the atmosphere.
Direct Air Capture (DAC) takes a different approach.
Instead of capturing emissions at the source, DAC technologies extract carbon dioxide that is already present in ambient air.
Captured CO₂ from DAC can either be:
Permanently stored underground
Used in industrial applications through CCU
Combined with green hydrogen to produce synthetic fuels
Because DAC actively removes carbon dioxide from the atmosphere, it is increasingly viewed as an important complement to emissions reduction efforts, particularly for achieving long-term net-zero and net-negative emissions.
Real-World Applications of Carbon Capture and Utilization
Around the world, companies are deploying CCU technologies to reduce emissions, create low-carbon products, and improve resource efficiency.
While adoption is still in its early stages, successful commercial projects demonstrate that captured CO₂ can become a valuable industrial resource rather than simply a waste product.
Let's explore some of the most common applications.
1. Cement and Concrete
The cement industry accounts for approximately 7-8% of global CO₂ emissions, making it one of the largest industrial contributors to climate change.
A significant portion of these emissions comes from the chemical process of converting limestone into clinker. Because these are process emissions, they cannot be eliminated simply by switching to renewable electricity.
Carbon capture technologies help address this challenge by capturing CO₂ directly from cement plants.
In some cases, the captured carbon is injected into fresh concrete during manufacturing. The CO₂ reacts with minerals in the concrete, becoming permanently mineralized while also improving the material's strength.
This approach not only reduces emissions but can also improve the performance of construction materials.
2. Steel Manufacturing
Steel production requires extremely high temperatures and energy-intensive processes, making it one of the most difficult industries to decarbonize.
Even with increasing use of renewable electricity and green hydrogen, certain production routes continue to generate significant CO₂ emissions.
Carbon capture technologies can be integrated into steel manufacturing facilities to capture emissions before they enter the atmosphere.
Captured CO₂ can then be utilized in industrial processes or permanently stored, depending on the project's objectives.
3. Chemicals and Synthetic Fuels
Carbon dioxide is an important raw material for manufacturing several industrial chemicals.
Instead of using fossil-derived carbon, captured CO₂ can be combined with green hydrogen to produce products such as:
Methanol
Sustainable aviation fuel (SAF)
Synthetic diesel
Synthetic methane
Industrial chemicals
When powered by renewable energy, these production pathways can significantly reduce lifecycle greenhouse gas emissions compared to conventional manufacturing methods.
However, it's important to note that when synthetic fuels are eventually used, much of the captured carbon is released back into the atmosphere. The primary climate benefit comes from replacing fossil-derived carbon with recycled CO₂, rather than permanently removing carbon from the atmosphere.
4. Food and Beverage Industry
Captured carbon dioxide has long been used in the food and beverage industry.
Purified CO₂ is commonly used for:
Carbonated beverages
Food preservation
Packaging
Refrigeration
Dry ice production
Although this represents a relatively small share of global CO₂ utilization, it demonstrates how captured carbon already supports established commercial applications.
5. Enhanced Oil Recovery (EOR)
Historically, one of the largest commercial applications of captured CO₂ has been Enhanced Oil Recovery (EOR).
In this process, compressed carbon dioxide is injected into mature oil reservoirs to improve oil extraction.
While EOR has helped advance carbon capture infrastructure, its role in climate mitigation remains the subject of ongoing debate because it supports continued oil production.
Can Carbon Capture Projects Generate Carbon Credits?
One common misconception is that every carbon capture project automatically generates carbon credits. Whether a project can generate carbon credits depends on several factors, including:
The carbon credit standard being used
Project methodology
Additionality requirements
Permanence of emissions reductions or removals
Monitoring and verification procedures
Some projects may qualify under recognized carbon standards, while others may only contribute to reducing an organization's own operational emissions.
Projects involving permanent geological storage or durable carbon removal are generally more likely to qualify than applications where the captured CO₂ is later released, such as synthetic fuels.
Organizations should therefore evaluate carbon credit eligibility based on the specific methodology and registry requirements applicable to their project.
And if you're not sure about this, our team of experts can help you identify the same.
Carbon Capture and Carbon Markets
Depending on the project design and applicable standards, eligible carbon capture projects may generate environmental attributes or carbon credits that can be traded in voluntary or compliance carbon markets.
These markets provide financial incentives for organizations to invest in emissions reduction and carbon removal technologies.
For businesses, this can create additional revenue opportunities while supporting broader decarbonization strategies.
Organizations looking to buy or sell verified environmental instruments can also benefit from Sustainiam's Emission Xchange, EmX, a unified platform that connects buyers, sellers, brokers, and simplifies market access, improves price discovery, and enhances transaction transparency.
The Importance of Measurement, Reporting, and Verification (MRV)
Capturing carbon is only one part of the equation. Organizations must also demonstrate how much carbon has been captured, where it came from, and what ultimately happened to it.
This is where Measurement, Reporting, and Verification (MRV) becomes essential. A robust MRV framework helps organizations:
Quantify captured emissions accurately
Track emissions reductions over time
Demonstrate compliance with regulations
Support carbon credit issuance where applicable
Improve transparency for investors and stakeholders
Without reliable emissions data, it becomes difficult to verify environmental claims or participate in carbon markets.
Platforms such as Sustainiam's Emission Calculator, ECal, help organizations measure, monitor, and report Scope 1, Scope 2, and Scope 3 emissions, providing the reliable emissions data needed to support broader decarbonization initiatives, including carbon capture projects.
Policy Support Driving Carbon Capture Adoption
Governments around the world are introducing policies to accelerate the deployment of carbon capture technologies.
These policies aim to reduce project costs, encourage private investment, and support industrial decarbonization.
Some of the most significant policy developments include:
United States - 45Q Tax Credit
The U.S. federal 45Q Tax Credit provides financial incentives for capturing and securely storing carbon dioxide or using it in eligible applications.
The Inflation Reduction Act significantly expanded these incentives, making carbon capture projects more financially attractive.
European Union - Net Zero Industry Act
The Net Zero Industry Act (NZIA) aims to strengthen Europe's manufacturing capacity for strategic net-zero technologies, including carbon capture and storage infrastructure.
The Act supports the development of CO₂ transport networks and storage capacity across member states.
Carbon Border Adjustment Mechanism (CBAM)
The European Union's Carbon Border Adjustment Mechanism (CBAM) places a carbon price on certain imported goods based on their embedded emissions.
Industries affected by CBAM are increasingly exploring carbon capture and other decarbonization strategies to remain competitive in international markets.
Challenges in Scaling Carbon Capture Technologies
Despite significant progress, several barriers continue to limit widespread adoption.
High Capital Costs
Carbon capture equipment requires substantial upfront investment, particularly for retrofitting existing industrial facilities.
Although costs are expected to decline as technologies mature, financing remains one of the biggest challenges.
Energy Requirements
Capturing, compressing, transporting, and storing carbon dioxide requires energy.
If this energy comes from high-emission sources, the overall climate benefits of the project may be reduced.
Integrating carbon capture with renewable electricity or low-carbon energy sources is therefore an important consideration.
Infrastructure Limitations
Many regions still lack the pipelines, transport systems, and geological storage infrastructure required to support large-scale carbon capture deployment.
Developing this infrastructure will require long-term public and private investment.
Carbon Capture as Part of a Broader Decarbonization Strategy
Carbon capture should not be viewed as a replacement for emissions reduction. Instead, it should complement other climate actions.
A robust decarbonization strategy typically follows a clear hierarchy:
Measure emissions across Scope 1, Scope 2, and Scope 3.
Reduce emissions through energy efficiency, renewable energy, electrification, and process improvements.
Capture unavoidable emissions using technologies such as CCU or CCS where technically and economically feasible.
Address remaining emissions through high-quality carbon credits or other recognized climate solutions.
By following this approach, organizations can reduce their overall carbon footprint while building a credible pathway toward net-zero emissions.
The Future of Carbon Capture and Utilization
Carbon Capture and Utilization is evolving rapidly.
Governments are introducing supportive policies, investors are increasing funding, and industries are actively exploring new ways to reduce emissions while maintaining competitiveness.
At the same time, ongoing research is making carbon capture technologies more efficient, scalable, and cost-effective.
Several trends are expected to shape the future of CCU, including:
Lower capture costs through technological innovation
Expansion of carbon transport and storage infrastructure
Greater use of captured CO₂ in low-carbon products
Stronger carbon pricing mechanisms
Growth of voluntary and compliance carbon markets
Increased demand for verified emissions data and transparent reporting
While challenges remain, CCU is expected to become an increasingly important component of industrial decarbonization over the coming decades.
According to the International Energy Agency (IEA) and the Intergovernmental Panel on Climate Change (IPCC), achieving global climate goals will likely require a portfolio of solutions, including renewable energy, energy efficiency, electrification, hydrogen, carbon capture, and carbon removal.
Conclusion
Carbon Capture and Utilization (CCU) is becoming an increasingly important tool in the global effort to reduce greenhouse gas emissions.
While renewable energy and energy efficiency remain the foundation of decarbonization, they cannot eliminate every source of industrial emissions. For sectors such as cement, steel, chemicals, and refining, carbon capture offers a practical way to address emissions that are otherwise difficult to avoid.
As technologies continue to mature and supportive policies expand, CCU is expected to play a larger role in helping organizations achieve their sustainability and net-zero goals.
However, successful carbon capture projects require more than just technology. Organizations also need accurate emissions data, reliable measurement and reporting, and robust verification processes to demonstrate progress and comply with evolving regulations.
By combining carbon accounting, emissions reduction initiatives, carbon capture, and participation in carbon markets where appropriate, businesses can build a more comprehensive and resilient climate strategy.
