title: "Carbon Capture and Storage (CCS)" description: How carbon capture technology works, current U.S. projects, costs, the 45Q tax credit, and the debate over its role in the energy transition. summary: How carbon capture technology works, current U.S. projects, costs, the 45Q tax credit, and the debate over its role in the energy transition. category: fossil-fuels difficulty: Advanced updated: 2026-02-10 tags: ["carbon capture", "CCS", "CCUS", "fossil fuels", "climate", "45Q", "technology"] relatedTools: [] faqs:
- question: What is carbon capture and storage? answer: CCS is a set of technologies that capture CO2 from large emission sources (power plants, industrial facilities), compress it, transport it via pipeline, and inject it into deep underground geological formations for permanent storage. When the captured CO2 is used in products or processes, it's called CCUS (carbon capture, utilization, and storage).
- question: How much does carbon capture cost? answer: Costs vary significantly by application. Post-combustion capture at a coal plant costs $50-$100+ per ton of CO2. Natural gas plant capture costs $40-$80/ton. Industrial cement and steel capture costs $50-$120/ton. Direct air capture (DAC) — removing CO2 from ambient air — costs $250-$600/ton currently.
- question: Does CCS work at scale? answer: As of 2025, there are about 40 commercial CCS projects operating worldwide, capturing approximately 50 million tons of CO2 per year — less than 0.15% of global annual emissions of ~37 billion tons. Most projects are in the oil/gas and chemical sectors. Power sector CCS has had limited success commercially.
- question: What is the 45Q tax credit? answer: The 45Q tax credit (enhanced by the IRA) pays $85/ton for CO2 geologically stored and $60/ton for CO2 used in enhanced oil recovery or other industrial uses. For direct air capture, the credit is $180/ton for storage and $130/ton for utilization. These are the most generous CCS incentives in the world.
Carbon Capture and Storage (CCS)
Carbon capture and storage is a suite of technologies designed to prevent CO₂ from reaching the atmosphere by capturing it at emission sources and storing it underground. It is one of the most debated technologies in the energy transition — praised as essential by some, criticized as a distraction by others.
How CCS Works
Step 1: Capture
Three main approaches:
Post-combustion capture: CO₂ is separated from flue gas after fuel is burned. Chemical solvents (typically amines) absorb the CO₂, which is then released by heating the solvent for reuse. This is the most mature technology and can be retrofitted to existing facilities.
Pre-combustion capture: Fuel is partially oxidized to produce a synthesis gas (syngas) of hydrogen and CO₂. The CO₂ is captured before combustion, and the hydrogen is burned for power. Used in integrated gasification combined cycle (IGCC) plants.
Oxy-fuel combustion: Fuel is burned in nearly pure oxygen instead of air, producing a flue gas that is mostly CO₂ and water vapor, making CO₂ separation straightforward. Energy-intensive oxygen separation is the main cost.
Step 2: Transport
Captured CO₂ is compressed to a supercritical fluid (dense, liquid-like state) and transported via:
- Pipeline: The primary method. Over 5,000 miles of CO₂ pipelines exist in the U.S. (mostly in Texas and the Permian Basin, originally built for enhanced oil recovery)
- Ship: Emerging for overseas transport
- Truck/rail: For smaller volumes or pilot projects
Step 3: Storage
CO₂ is injected 1-2+ km underground into:
- Saline aquifers: Deep formations filled with saltwater — by far the largest storage capacity. The U.S. has estimated saline aquifer storage capacity of 2,600-22,000 billion metric tons
- Depleted oil and gas reservoirs: Well-characterized geology, but limited capacity
- Enhanced oil recovery (EOR): CO₂ injection to extract additional oil from aging fields. Controversial because it extends fossil fuel production
Monitoring: Injection sites require continuous monitoring (seismic, pressure, geochemical) to ensure CO₂ stays sequestered. The EPA's Underground Injection Control (UIC) Class VI wells program governs CO₂ storage.
Current U.S. CCS Projects
Operating
| Project | Type | CO₂ Captured (Mt/year) | Status | |---------|------|:-:|--------| | Century Plant (TX) | Natural gas processing | 5.0 | Operating since 2010 | | Shute Creek (WY) | Natural gas processing | 7.0 | Operating since 1986 | | Illinois Industrial CCS | Ethanol production | 1.0 | Operating since 2017 | | Air Products SMR (TX) | Hydrogen production | 1.0 | Operating since 2013 | | Petra Nova (TX) | Coal power plant | 1.4 | Restarting (was mothballed) |
Under Development
The IRA's enhanced 45Q credit has triggered a wave of proposed projects:
- 30+ announced projects in the power and industrial sectors
- Several direct air capture (DAC) hubs funded by DOE
- CO₂ pipeline networks proposed in the Midwest and Gulf Coast
Global Context
| Country/Region | Operating CCS Capacity (Mt CO₂/year) | |---------------|:-:| | United States | ~15 | | Canada | ~5 | | Norway | ~1.7 | | Australia | ~4 | | China | ~3 | | Global Total | ~50 |
The 45Q Tax Credit
The IRA significantly enhanced the Section 45Q tax credit for CCS:
| Application | Storage Credit ($/ton) | Utilization Credit ($/ton) | |------------|:-:|:-:| | Industrial and power plant CCS | $85 | $60 | | Direct air capture (DAC) | $180 | $130 |
Key provisions:
- Available for facilities beginning construction before 2033
- 12-year credit period from when equipment is placed in service
- Transferable (can be sold to other taxpayers)
- Minimum capture thresholds: 18,750 tons/year for power plants, 12,500 tons for industrial, 1,000 tons for DAC
- Prevailing wage and apprenticeship requirements for full credit
The Costs
Capture Costs by Source
| CO₂ Source | Concentration | Capture Cost ($/ton CO₂) | |-----------|:-:|:-:| | Ethanol fermentation | ~100% | $15-$25 | | Natural gas processing | 5-70% | $15-$30 | | Hydrogen (SMR) | 15-40% | $30-$50 | | Cement production | 15-30% | $50-$120 | | Steel production | 20-30% | $50-$100 | | Natural gas power plant | 3-5% | $40-$80 | | Coal power plant | 10-15% | $50-$100+ | | Direct air capture | 0.04% | $250-$600 |
The lower the CO₂ concentration in the gas stream, the more energy-intensive and expensive the capture process.
Energy Penalty
CCS reduces the net power output of a plant:
- Coal plants with CCS: 25-40% energy penalty (a 1,000 MW plant effectively becomes 600-750 MW)
- Natural gas plants with CCS: 15-25% energy penalty
- This additional energy consumption increases fuel use and costs per unit of net electricity delivered
The Debate
Arguments For CCS
- Hard-to-decarbonize sectors: Cement, steel, and chemical production have process emissions that can't be eliminated by switching to renewable electricity. CCS may be essential for these industries
- Existing infrastructure: Retrofitting some existing plants with CCS may be more practical than premature retirement in certain cases
- Negative emissions: Direct air capture + storage (DACCS) could achieve net removal of CO₂ from the atmosphere — potentially necessary to meet climate targets
- Hydrogen production: "Blue hydrogen" (SMR + CCS) may complement "green hydrogen" (electrolysis) as hydrogen demand grows
Arguments Against CCS
- Cost: In the power sector, new renewables + storage are now cheaper than fossil generation with CCS in most cases
- Track record: CCS has repeatedly underperformed expectations. After decades of development and billions in investment, it captures less than 0.15% of global emissions
- Moral hazard: Critics argue CCS gives fossil fuel companies justification to delay the transition to clean energy
- Energy penalty: CCS increases fuel consumption, potentially increasing other environmental impacts (mining, water use, methane leakage)
- Lock-in risk: Building CCS infrastructure creates financial incentives to continue operating fossil fuel facilities for decades
The Emerging Middle Ground
Most energy analysts now suggest CCS is:
- Not a solution for the power sector (renewables + storage are cheaper)
- Potentially necessary for heavy industry (cement, steel, chemicals)
- Essential for negative emissions (DAC) if climate targets are to be achieved
- Useful for blue hydrogen production as a transition pathway
What Homeowners Should Know
CCS is primarily an industrial-scale technology — you won't install it at home. But it matters to you because:
- It affects electricity rates: If your utility invests in CCS projects, those costs may be passed through to ratepayers
- Tax implications: The 45Q credit is funded by federal tax revenue
- Climate impact: The success or failure of industrial CCS affects the overall pace of decarbonization
- Hydrogen economy: If blue hydrogen becomes common and cheap, it could affect the economics of home heating and fuel cells
The most direct way homeowners can reduce their own carbon footprint remains efficiency improvements, electrification, and rooftop solar — all of which are proven, available today, and improving rapidly.