Carbon capture and storage (CCS) technology enables fossil fuel power plants and industrial processes like cement production to reduce emissions, providing one of the essential tools necessary for combating climate change.
CO2 collected for storage purposes is transported and injected into geologic formations suitable for this task, including deep saline aquifers or depleted oil and gas reservoirs.
What is Carbon Capture and Storage?
Carbon Capture and Storage (CCS) technology enables industrial production without contributing to atmospheric CO2. CCUS involves collecting emissions from power stations or other sources and then storing them underground before returning them into the atmosphere.
Capturing takes place at the point of emission – such as fossil fuel power plants or industrial processes producing cement, steel and chemicals. CO2 is chemically separated into liquid form before being transported via pipeline or ship to deep geological storage sites such as former oil or gas reservoirs, saline formations or unmineable coal beds for permanent storage.
Sometimes captured CO2 can be utilized rather than stored, leading to reduced emissions and ultimately carbon utilization or negative emissions technologies are a great complement for renewable energy usage by helping avoid the shutdown of existing coal or gas plants. Unfortunately, however, they cannot replace climate mitigation action or help lower global emissions levels.
What are the Benefits of Carbon Capture and Storage?
CCS technology helps reduce greenhouse gas emissions by keeping carbon dioxide out of the atmosphere before production takes place. As such, CCS plays an integral part in combatting climate change and helping transition towards a low-carbon economy.
Carbon capture and storage technologies have already been employed at numerous large point sources, such as coal- and natural gas-fired power plants, steel mills, and cement facilities. Carbon Capture Utilization Storage (CCUS) technologies capture CO2 emissions streams before entering the atmosphere before either using or storing it underground – known as Carbon Capture, Utilization, and Storage (CCUS).
At power plants with CCS technology, captured CO2 is used to produce electricity by mixing it with steam, and later separated and compressed before being transported via pipelines, trucks or ships to geological storage sites where it will be injected deep into rock formations such as depleted oil and gas reservoirs or saline aquifers for geologic storage.
What are the Risks of Carbon Capture and Storage?
As carbon capture and storage is seen as an effective weapon against climate change, it’s crucial that its advantages and disadvantages are thoroughly understood.
Contrasting carbon offsetting, which seeks to compensate for emissions by planting trees or investing in renewable energy sources that absorb CO2, CCS acts directly upon carbon pollution at its source and keeps it out of the atmosphere altogether.
CCS typically uses post-combustion technology, which involves pipelining smokestack flue gases into an apparatus which separates out CO2 from other combustion products and transports it for storage. Other techniques, including direct air capture (DAC), may also be employed.
CCS may pose certain risks, including leakage of compressed CO2 underground that could pollute drinking water supplies or trigger earthquakes; nevertheless, it’s generally considered safe technology. Improvements will need to be made and costs reduced in order for CCS technologies to continue operations successfully.
What are the Potential Benefits of Carbon Capture and Storage?
Capturing carbon dioxide emissions from power plants and industrial facilities and then storing them underground could reduce greenhouse gas (GHG) emissions and combat climate change, while simultaneously improving economic competitiveness of fossil-fueled energy sources and supporting sustainable industrial operations.
CCS projects currently capture and store approximately 45 million tons of CO2 every year, making this technology suitable for large stationary sources such as coal- and natural-gas-fired power plants as well as cement and steel factories.
Captured CO2 is then transported to geological storage sites via pipeline or ship and injected into deep rock formations such as saline aquifers or depleted oil and gas reservoirs for storage.
Utilization is another possible use for captured carbon dioxide, including using it to manufacture plastics or concrete products. However, this process requires large amounts of carbon-free electricity; currently estimated as being less than 10% of total captured CO2.