Rajan Wilcox
Fossil fuels are a major source of electricity, with coal, oil, and gas being the largest source of global carbon dioxide emissions. In 2017, fossil fuels generated 64.5% of worldwide electricity, a figure that has risen since 1990. Fossil fuels are burned to generate electricity, a process known as thermal generation. This process involves heating water to produce steam, which then rotates a steam turbine to generate electricity. While fossil fuels are inexpensive and reliable, they contribute to air pollution and climate change. Nuclear and renewable energy sources are increasingly important in addressing these issues and providing a clean energy future.
| Characteristics | Values |
|---|---|
| Percentage of global electricity generated from fossil fuels | 64.5% in 2017 |
| Percentage of global electricity generated from low-carbon sources | Just over 1/3 |
| Major fossil fuels used for electricity generation | Coal, natural gas, petroleum, oil, diesel |
| How fossil fuels generate electricity | Burning fossil fuels heats water, which produces steam that rotates a turbine to generate electricity |
| Other technologies used in fossil fuel plants | Combustion turbines, combined cycle power plants |
| Advantages of fossil fuels | Inexpensive, reliable, easy to extract, transport and store |
| Disadvantages of fossil fuels | Leading source of global CO2 emissions, air pollution, potential supply issues, volatile prices |
| Percentage of US electricity generated from fossil fuels | 60% in 2023 |
| Percentage of US electricity generated from nuclear energy | 18-19% in 2023 |
| Percentage of US electricity generated from renewables | 21% in 2023 |
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What You'll Learn
Fossil fuels are the largest source of global CO2 emissions
Fossil fuels are the largest source of global carbon dioxide (CO2) emissions. In 2018, 89% of global CO2 emissions came from fossil fuels and industry. The burning of fossil fuels releases CO2, with coal being the largest contributor to global temperature rise, responsible for over 0.3 degrees Celsius of the 1-degree increase in global average temperatures. Oil, another significant component of fossil fuels, releases approximately one-third of the world's total carbon emissions when burned. Natural gas, while promoted as a cleaner alternative to coal and oil, is still a fossil fuel that accounts for one-fifth of the world's total carbon emissions.
The use of fossil fuels for energy production and industrial activities is a major contributor to CO2 emissions. In 2024, China's energy-related CO2 emissions grew due to increased industrial activity and energy access. Similarly, India's energy-related CO2 emissions rose by 5.3% in 2024, driven by economic growth, infrastructure development, and surging energy demand. However, in advanced economies, energy-related CO2 emissions decreased by 1.1% in the same year, reflecting a transition to low-emissions energy sources.
The transportation sector, which relies heavily on fossil fuels, contributes 15% of global greenhouse gas emissions. The aviation industry, in particular, has seen a recovery from the COVID-19 pandemic, resulting in higher emissions. Additionally, global temperatures significantly impact energy sector emissions, with extreme temperatures increasing the demand for heating and cooling.
To address the issue of fossil fuel emissions, governments worldwide signed the Paris Agreement in 2015, committing to reduce carbon emissions. Despite this, fossil fuel companies continue to be major polluters, investing heavily in oil and gas while advertising low-carbon alternatives. The transition to renewable energy sources is crucial to reducing CO2 emissions, and countries like Sweden, Norway, and France have made significant progress in this direction.
In summary, fossil fuels are the dominant source of global CO2 emissions, with coal, oil, and natural gas being the primary contributors. The burning of these fuels for energy, industrial activities, and transportation has led to significant CO2 emissions and global temperature rise. Efforts to transition to renewable energy sources and reduce emissions are ongoing, but more needs to be done to meet the targets set by the Paris Agreement.
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Coal is the largest source of electricity globally
Fossil fuels, which include coal, oil, and gas, are the largest source of global carbon dioxide (CO2) emissions. While oil and gas account for a small share of electricity production, coal is the largest source of electricity worldwide. In 2022, coal-fired generation reached an all-time high, contributing to record levels of CO2 emissions from coal-fired power plants. Coal supplied just over a third of the world's electricity generation, despite being the most carbon-intensive fossil fuel.
Coal continues to play a crucial role in electricity production in many countries, including China, India, and those in the Asia Pacific region. China, driven by energy security concerns and local economic interests, added 11 GW of new coal-fired power plants to its grid in 2022. India's extreme heatwaves in the summer of 2022 also led to a sharp increase in electricity demand, which was primarily met by coal-fired generation, resulting in an 8.5% year-on-year increase. Similarly, coal-fired generation in the European Union increased by nearly 7% due to low hydropower and nuclear output.
However, some countries have significantly reduced their reliance on coal. For example, the UK has seen a dramatic decline in coal's contribution to its electricity mix, shifting towards other energy sources. While nuclear power has long been a key player in low-carbon electricity production, renewables such as wind and solar are growing quickly and are expected to account for a large share of electricity production in the future.
To meet net-zero emissions targets, it is crucial to transition away from coal and other fossil fuels. This transition requires regulatory and operational changes, such as adopting a wider range of smaller and more distributed sources for grid services. Additionally, the development and deployment of less polluting and more efficient technologies, such as carbon capture, utilisation, and storage (CCUS), are essential to reduce emissions from coal-fired power plants.
While coal currently dominates global electricity production, the trend is shifting towards cleaner and more sustainable energy sources. The transition to low-carbon sources, such as renewables and nuclear energy, is accelerating, driven by the urgent need to address climate change and reduce carbon emissions.
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Gas is the second-largest source of electricity production
Fossil fuels, including coal, oil, and gas, are currently the world's largest source of electricity production. However, there are ongoing efforts to transition to low-carbon sources such as renewables and nuclear energy. Gas is the second-largest source of electricity production globally, after coal. While coal is the dominant source of electricity in many countries, some nations, like the UK, have significantly reduced their reliance on coal in recent years.
In the United States, about 60% of electricity generation in 2023 came from fossil fuels, including coal, natural gas, petroleum, and other gases. Nuclear energy accounted for about 19% of electricity generation, while renewable energy sources contributed about 21%. Small-scale solar photovoltaic systems generated an additional 73.62 billion kilowatthours (kWh) of electricity in the United States in 2023.
The US uses a variety of energy sources and technologies for electricity generation, and these sources have changed over time. The three primary categories of energy for electricity generation are fossil fuels, nuclear energy, and renewable energy. Steam turbines, which utilize fossil fuels, nuclear, biomass, geothermal, or solar thermal energy, are the most common method of electricity generation. Other significant electricity generation technologies include gas turbines, hydro (water) turbines, wind turbines, and solar photovoltaics.
Gas turbines are a key technology in electricity generation, and natural gas is a significant component of the energy mix in the United States. While the US has a diverse range of energy sources, natural gas plays a crucial role in meeting the country's electricity needs. As the world transitions to cleaner energy sources, the importance of natural gas as a flexible and relatively low-carbon fossil fuel is likely to persist in the energy mix.
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Fossil fuels are inexpensive to extract, transport and use
Fossil fuels, including coal, oil, and natural gas, have been the primary energy source for over 150 years, currently supplying about 80% of the world's energy. In 2023, about 60% of electricity generation in the United States was from fossil fuels, with coal being the most significant source.
Fossil fuels are considered inexpensive to extract, transport, and use for several reasons. Firstly, fossil fuels are often easily accessible through mining and drilling operations. For example, coal can be obtained through surface mining, which involves removing the top layers of soil and rock to access the coal seams. Oil, on the other hand, is mostly pumped out of underground reservoirs, but it can also be sourced from shale and tar sands deposits.
Secondly, the infrastructure for fossil fuel extraction, transportation, and use has been well-established over many decades. This includes pipelines, refineries, storage facilities, and distribution networks. The economies of scale achieved through this extensive infrastructure contribute to the perceived low cost of fossil fuels.
Additionally, the energy density of fossil fuels makes them relatively easy to transport and store in large quantities. This efficiency in transportation and storage further reduces the apparent cost of using fossil fuels.
However, it is important to note that the true cost of fossil fuels is much higher when considering the environmental and health impacts. Fossil fuels are the largest source of global carbon dioxide (CO2) emissions, contributing to climate change and extreme weather events. The combustion of fossil fuels releases greenhouse gases and pollutants that have detrimental effects on public health, particularly in communities near transportation corridors and industrial areas.
Furthermore, there are significant hidden costs associated with the inefficiencies of the fossil energy system. It is estimated that almost two-thirds of all primary energy is wasted in energy production, transportation, and use, amounting to over $4.5 trillion per year, or nearly 5% of global GDP. These losses occur during extraction, processing in refineries, and transportation to supply centers.
As a result, there is a growing transition towards cleaner and more efficient energy sources, such as renewable and nuclear power. While these alternatives may have higher initial investment costs, they offer significant long-term economic and environmental benefits by reducing waste and mitigating the impacts of climate change.
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Nuclear power is an important part of reducing fossil fuel use
Fossil fuels, including coal, natural gas, and petroleum, are major sources of electricity generation. In 2023, about 60% of electricity generation in the United States came from these fossil fuels. However, there is a growing need to transition away from them due to their significant environmental impact. Fossil fuels are the largest source of global carbon dioxide emissions, contributing to climate change and other environmental issues.
Nuclear power is an essential part of reducing our reliance on fossil fuels and mitigating their environmental impacts. Nuclear energy is a zero-emission, clean energy source that can produce massive amounts of carbon-free power. It generates electricity through nuclear fission, the process of splitting uranium atoms to produce energy. This process does not produce the harmful byproducts associated with fossil fuels, keeping the air clean and reducing carbon dioxide emissions.
Nuclear power plants have several advantages over fossil fuel plants. Firstly, they require a minuscule amount of fuel to generate the same amount of electricity. For example, 1 kg of uranium contains the same energy as 2.7 million kg of coal. This makes nuclear fuel extremely dense and reliable, ensuring a consistent energy supply for decades. Secondly, nuclear power plants have a longer operational lifespan than gas or coal-fired power stations, with some new-generation stations certified for up to 80 years of operation. This longevity contributes to their reliability and sustainability.
Additionally, nuclear energy has the potential to directly replace fossil fuel plants. Nuclear power is scalable and reliable, making it capable of meeting the increasing demand for electricity. Countries like France have successfully transitioned to nuclear power, with over 70% of their electricity generated from nuclear sources, resulting in significantly reduced emissions compared to the European average. This demonstrates that nuclear energy can be rapidly expanded to combat climate change effectively.
While concerns remain about the disposal of spent nuclear fuel, nuclear power remains a critical component of global efforts to reduce fossil fuel use and mitigate climate change. Its ability to produce large-scale, carbon-free energy makes it a pivotal part of the transition to clean, net-zero energy systems. Nuclear power plants, such as the Diablo Canyon power station in California, provide reliable and affordable electricity, contributing to the goal of reducing our dependence on fossil fuels.
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Frequently asked questions
Fossil fuels are fuels made from the remains of dead plants and animals. Coal, natural gas, and petroleum are the most commonly used fossil fuels for electricity generation.
Fossil fuels are burned or combusted to generate electricity. This process is called thermal generation. The burning of coal or oil heats giant boilers filled with water, transforming the liquid water into steam. The steam creates pressure in the boiler, which rotates a steam turbine, driving a generator to produce electricity.
Fossil fuels are inexpensive and reliable. They are easy to extract, store, transport, and use, and they do not rely on external factors like weather conditions.
