Molly Ayala
Carbon dioxide and electricity are closely related, with electricity generation being a major contributor to global carbon dioxide emissions. The burning of fossil fuels like coal, natural gas, and oil to generate electricity has led to significant carbon dioxide emissions, contributing to global warming and climate change. In 2023, utility-scale electric power plants burning fossil fuels accounted for about 99% of associated CO2 emissions in the United States. However, the electricity sector also offers opportunities for decarbonization, with sources like hydro, nuclear, wind, and solar providing clean energy. Additionally, efforts are being made to capture and store carbon dioxide, such as through carbon capture and storage (CCS) technologies and the exploration of using carbon dioxide to generate electricity.
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What You'll Learn
Carbon capture and storage
CCS has been in operation since 1972 in the US, where several natural gas plants in Texas have captured and stored more than 200 million tons of CO2 underground. CCS is considered a proven technology that has been in safe operation for over 45 years.
CCS involves capturing CO2 emissions from industrial processes, such as steel and cement production, or from the burning of fossil fuels in power generation. This CO2 is then transported from where it was produced, either via ship or in a pipeline, and stored deep underground in geological formations. The Intergovernmental Panel on Climate Change (IPCC) has emphasized the importance of CCS in achieving the ambitions of the Paris Agreement and limiting future temperature increases to 1.5°C (2.7°F).
There are different options for CO2 storage, including onshore or offshore storage in saline aquifers or depleted gas fields. In mineral storage, captured CO2 is reacted with naturally occurring iron (Fe), magnesium (Mg), and calcium (Ca) minerals, which prevents the re-release of CO2 into the atmosphere. Another option is bioenergy with CCS (BECCS), where biomass, like wood or grasses, removes CO2 from the air through photosynthesis. The biomass is then harvested and burned in a power plant to produce energy, with the resulting CO2 being captured and stored.
CCS projects are currently storing almost 45 million tons of CO2 every year, which is comparable to the amount of CO2 emissions created by 10 million passenger cars. While CCS has the potential to significantly reduce CO2 emissions, it requires a lot of energy and increases the fuel needs of power plants. Additionally, capturing CO2 from the air is much less efficient and more expensive than capturing it from smokestacks, although several new types of capture processes are under development.
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Carbon dioxide emissions from electricity generation
In 2021, the United States relied on natural gas for 38% of its electricity, coal for 22%, and other petroleum products for around 1%. The electric power sector accounted for about 30% of U.S. carbon dioxide emissions, with coal-fired generation making up nearly 60% of these emissions. However, emissions from the electric power sector have been declining, with a 35% reduction since 2005. This decrease is largely due to a shift from coal-fired generation to natural gas and an increase in renewable energy sources, which do not emit carbon dioxide.
Despite the progress in reducing emissions from the electric power sector, much of the world is still reliant on electricity generated from fossil fuels. In 2023, utility-scale electric power plants burning fossil fuels accounted for 99% of the associated CO2 emissions in the United States. The electricity sector is the most readily decarbonized, with the ability to utilize non-fossil, low-carbon energy sources such as hydro, nuclear, wind, and solar. However, limited progress has been made, and 50% more electricity is generated from fossil fuels today than 20 years ago.
To address the issue of carbon dioxide emissions from electricity generation, various techniques have been proposed to actively remove carbon dioxide from the atmosphere. One method involves capturing carbon dioxide from power plant smokestacks and injecting it into methane hydrates, which are large deposits of icy water and methane under the seafloor. The incoming carbon dioxide would displace the methane, which could then be burned to generate electricity or sold to power the sequestration operation. While this technique faces practical challenges, it offers a potential solution to reducing carbon dioxide emissions from electricity generation and mitigating the impacts of climate change.
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Fossil fuels and electricity
Fossil fuels, such as coal, oil, and gas, have been the traditional source of electricity for various sectors. Fossil fuel power plants burn these fuels to create heat, which generates steam to drive turbines and produce electricity. However, burning carbon-based fuels releases large amounts of carbon dioxide (CO2) and other pollutants like oxides of sulphur and nitrogen, contributing to climate change and air pollution. The health consequences of air pollution from fossil fuel use are significant, with an estimated 670,000 premature deaths in China annually attributed to coal usage.
The electricity sector is crucial in the transition to a decarbonized economy. Electricity provides a means to utilize low-carbon energy sources, such as hydro, nuclear, wind, and solar power. In 2022, the US electric power industry accounted for about 33% of total energy-related CO2 emissions, a slight decrease due to a reduction in the carbon intensity of electric power sources. As of March 2025, fossil fuels accounted for less than 50% of US electricity generation for the first time, with wind and solar power playing an increasingly dominant role.
While fossil fuels have dominated electricity generation, a shift towards cleaner energy sources is underway. Nuclear power, for example, generated 10.5% of the world's electricity in 2018 and is considered environmentally friendly as it does not produce greenhouse gases in the fission process. Biomass has also been explored as an alternative, although it has similar greenhouse gas emissions to fossil fuels and contributes to air pollution.
To address the CO2 emissions from fossil fuel power plants, there are proposals for carbon capture and storage (CCS) technologies. CCS involves capturing CO2 emissions from power plants and injecting them deep underground. While this technology shows promise, the electricity sector remains emissions-intensive, and further progress is needed to reduce the environmental and health impacts of fossil fuel usage.
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Reducing carbon dioxide emissions
The electricity sector is responsible for a significant proportion of carbon dioxide emissions, with fossil fuels being the primary source of energy generation. To reduce carbon dioxide emissions, a transition to cleaner and renewable energy sources is essential.
One effective way to reduce carbon dioxide emissions is to adopt renewable and low-carbon energy sources such as hydro, nuclear, wind, and solar power. These sources are considered carbon-neutral and can significantly decrease emissions from the electricity sector. Nuclear power generation produces negligible carbon dioxide emissions compared to fossil fuel power plants. By transitioning from fossil fuels to these cleaner alternatives, we can improve air quality and centralize energy-related emissions, making emissions regulation more manageable.
Additionally, implementing carbon capture and storage (CCS) technologies can help mitigate carbon dioxide emissions from power plants. CCS involves capturing CO2 emissions from burning fossil fuels and injecting them deep underground for storage. While this approach prevents emissions from entering the atmosphere, it does not address the underlying issue of fossil fuel usage.
Another way to reduce carbon dioxide emissions is by improving energy efficiency and reducing energy consumption. This can be achieved through proper insulation, sealing air leaks, and upgrading windows and doors in homes, businesses, and public institutions. Switching to energy-efficient appliances and lighting, such as LED lights, can also significantly reduce energy consumption and lower carbon emissions.
Transportation is another major contributor to carbon dioxide emissions. To address this, individuals can opt for zero-emission vehicles (ZEVs), such as electric cars, or utilize public transportation, carpooling, or active transportation like walking and cycling. These choices can significantly reduce an individual's carbon footprint and contribute to lower emissions on a larger scale.
Finally, nature-based solutions, such as reforestation and afforestation, play a crucial role in reducing carbon dioxide levels. Trees absorb carbon dioxide through photosynthesis, converting it into carbon stored in wood and soils. Initiatives to expand and restore tree cover, including urban reforestation, can help mitigate carbon emissions while also providing numerous ecological benefits.
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The social cost of carbon
The SCC is calculated using integrated assessment models, which simulate the pathway by which an additional ton of emissions leads to changes in atmospheric concentrations, resulting in variations in global temperature and precipitation. These changes then have biophysical impacts on agriculture and sea levels, ultimately affecting the economy and human welfare. The models used to estimate the SCC are based on research and expertise from various fields, including climate science, demography, and economics.
The SCC has been used in the United States to determine fuel economy standards, and several states require electric utility companies to consider the SCC in their operations. The EPA's central estimate of the SCC as of 2023 is $190 per ton of CO2, a significant increase from previous federal estimates. The SCC has also been used as a basis for the value of "zero-emission credits" in some states.
Furthermore, the SCC can be used to support the transition to cleaner energy sources. The electricity sector is one of the most significant contributors to carbon emissions, with fossil fuel power plants producing a considerable amount of CO2. By considering the SCC, policymakers can prioritize investments in low-carbon energy sources such as hydro, nuclear, wind, and solar power, which can help reduce carbon emissions and mitigate the social cost of carbon.
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Frequently asked questions
Fossil fuels are burned to power turbines or generators that use heat to turn and create electricity. The burning of fossil fuels for electricity is one of the primary human activities that contribute to carbon dioxide emissions.
Carbon dioxide emissions from electricity generation are a major contributor to global warming and climate change. It leads to public health consequences, increases in extreme weather patterns, and food and water shortages.
In 2022, the US electric power industry accounted for about 33% of total US energy-related carbon dioxide emissions, while the electric power sector accounted for about 31%.
One proposed solution is carbon capture and storage (CCS), which involves capturing the carbon dioxide emissions from burning fossil fuels in power plants and injecting them deep underground. Another method involves pumping airborne carbon dioxide into methane hydrates, where the gas would be permanently stored, with the released methane being used to generate electricity.
