Regan Brown
Fossil fuels have been the dominant energy source for generating electricity worldwide over the past century. In 2017, fossil fuels generated 64.5% of electricity worldwide, with coal being the most widely used fossil fuel. Other fossil fuels used for electricity generation include natural gas, fuel oil, and petroleum. While fossil fuels are inexpensive and reliable, they produce pollutants such as nitrogen oxides, sulfur dioxide gas, and particulate matter, contributing to air pollution and climate change. As a result, there is a growing shift towards renewable and low-carbon energy sources, such as nuclear and renewable electricity.
| Characteristics | Values |
|---|---|
| Percentage of worldwide electricity generated by fossil fuels in 2017 | 64.5% |
| Percentage of worldwide electricity generated by fossil fuels in 2023 | Unknown, but fossil fuels remain the dominant source of electricity worldwide |
| Percentage of U.S. electricity generated by petroleum in 2023 | 0.4% |
| Percentage of U.S. utility-scale electricity generation from other gases and sources in 2023 | 0.5% |
| Main fossil fuels used for electricity generation | Coal, natural gas, and petroleum |
| Other fossil fuels used for electricity generation | Fuel oil, residual fuel oil, distillate fuel oil, diesel fuel oil, blast furnace gas, other manufactured and waste gases derived from fossil fuels |
| Advantages of using fossil fuels for electricity generation | Inexpensive, reliable, straightforward to extract, easy to store and transport, high energy density, not dependent on weather |
| Disadvantages of using fossil fuels for electricity generation | Produces pollutants (nitrogen oxides, sulfur dioxide gas, particulate matter), non-renewable resource, contributes to climate change, air pollution |
| Alternatives to fossil fuels for electricity generation | Nuclear energy, renewable energy (biomass, hydroelectricity, solar photovoltaics, wind turbines, etc.), geothermal energy |
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What You'll Learn
Fossil fuel power plants burn coal, oil, or gas to create heat
Fossil fuels have been the dominant energy source for electricity generation worldwide. In 2017, they generated 64.5% of electricity worldwide. Fossil fuel power plants burn coal, oil, or gas to create heat, which is used to generate steam to drive turbines that generate electricity. This process is known as thermal generation.
Coal is the most abundant fossil fuel and has historically been the dominant energy source for power generation, especially during the Industrial Revolution. It is widely used as the source of energy in thermal power stations and is a relatively cheap fuel due to its availability and energy density. However, coal produces more greenhouse gas emissions and pollution than an equivalent amount of petroleum or natural gas. For instance, the operation of a 1000-MWe coal-fired power plant results in a nuclear radiation dose of 490 person-rem/year, compared to 136 person-rem/year for an equivalent natural gas plant.
Oil, another fossil fuel used in power plants, has advantages over coal in terms of transportation, handling, and on-site storage. It is important to note that distillate oil is still used as the fuel source for diesel engine power plants, especially in isolated communities not connected to a grid. However, after oil price increases in the 1970s, coal and natural gas gained prominence as alternative fuel sources.
Natural gas plants have become more prominent in recent years due to their efficiency and lower emissions compared to coal. Their combined-cycle generators recover and recycle waste heat, making them more efficient for electricity production. Additionally, gas-fired turbines have faster start-up times than coal-fired ones.
The use of fossil fuels for electricity generation has raised concerns about economic costs and environmental impacts, including the release of carbon dioxide and other pollutants contributing to global climate change. As a result, there has been a shift towards renewable energy sources such as solar and wind power, as well as natural gas.
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The heat is used to generate steam
Fossil fuels are burned in a furnace, creating hot gases which flow through a boiler. This boiler is filled with water, and the heat from the furnace transforms this water into steam. This steam is then sent through controlling valves to a turbine. The steam is under high pressure, and as it expands and cools, its energy is transferred to the turbine blades, rotating the turbine. This drives a generator to produce electricity. This process is known as thermal generation.
The steam turbine is the prime mover in a fossil fuel power plant, but other types of turbines can also be used, such as gas turbines or, in small plants, reciprocating gas engines. Gas turbines are fuelled by natural gas or fuel oil, and are often used for prime power in communities not connected to a widespread power grid. They can also be used in conjunction with a heat recovery steam generator (HRSG) in a combined cycle power plant. In this setup, the gas turbine generates electricity in a first stage, and the hot exhaust gases are then used to heat a boiler to produce steam to drive a steam generator turbine for further electricity generation. This combined cycle setup is more efficient than using either combustion turbines or steam-generating units separately.
Steam-powered turbines have a thermal efficiency of around 35%, meaning that 35% of the energy of the fuel is transformed into electricity. More efficient steam-generating units are being employed in newer power plants, with a thermal efficiency of around 50%. The useful life of these facilities usually spans several decades.
In addition to steam turbines, other major electricity generation technologies include gas turbines, hydro (water) turbines, wind turbines, and solar photovoltaics.
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The steam drives a turbine
Fossil fuels have been the main energy source for generating electricity over the past century. In 2017, they generated 64.5% of electricity worldwide. Fossil fuel power plants burn coal or oil to create heat, which is used to generate steam to drive turbines that generate electricity. This process is known as thermal generation.
Steam turbines are made in a variety of sizes, ranging from small units used as mechanical drives for pumps to large turbines used to generate electricity. They are much more compact than steam engines, allowing them to be used in spaces where space is limited, such as in steamships and power plants. The first modern steam turbine was developed by Sir Charles A. Parsons in 1884 and generated just 7.5 kW of power. Today, large-scale power plants use steam turbines capable of generating over 1,000 MW of power.
Steam turbines are the preferred method for large-scale electricity production due to their high efficiency and cost-effectiveness. They can operate at high speeds, with typical power plant steam turbines rotating at 1800-3600 rpm, about 100-200 times faster than wind turbines. They also have advantages over reciprocating engines in terms of size, maintenance, weight, and vibration.
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The turbine generates electricity
Fossil fuels have been the dominant energy source for electricity generation worldwide. In 2017, they generated 64.5% of electricity worldwide, up from 61.9% in 1990. Fossil fuel power plants burn coal, oil, or natural gas to create heat, which is used to generate steam to drive turbines. This steam flows into the turbine, spinning the blades.
Turbines play a crucial role in modern electricity production. They convert kinetic energy into electrical energy. The spinning turbine blades rotate a magnet inside coils of copper wire, which creates an electrical charge by inducing voltage differences within the conductor. This results in a steady flow of electricity. The faster the turbine spins, the greater the electrical output.
The spinning of the turbine blades also draws more air into the compressor, sustaining a continuous cycle. This rotation powers the generator, converting mechanical energy into electricity. This process is known as electromagnetic induction, discovered by Michael Faraday in 1832.
There are different types of turbines used for electricity generation, including steam turbines, combustion gas turbines, hydro (water) turbines, and wind turbines. Steam turbines use high-pressure steam to spin the blades, while combustion gas turbines use hot gases produced by burning fossil fuels. Hydro turbines use the force of moving water, and wind turbines use the power of the wind to move the blades of a rotor.
The electricity generated by turbines can be distributed to power millions of homes. Operators carefully control turbine speed and load demand to ensure consistent power production.
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Fossil fuels are inexpensive and reliable but produce pollutants
Fossil fuels are energy sources that have been predominantly used to generate electricity over the past century. They include coal, natural gas, and petroleum. In 2017, fossil fuels generated 64.5% of electricity worldwide.
Fossil fuels are inexpensive and reliable. They are energy-dense, making them easy to store and transport. The infrastructure required to extract, transport, and use fossil fuels already exists, making them a cheap source of energy. They are also reliable because they do not rely on factors like the weather.
However, fossil fuels produce pollutants. Burning fossil fuels releases nitrogen oxides and sulfur dioxide gas, which contribute to the formation of smog and acid rain. Acid rain harms soils, forests, lakes, and rivers. Fossil fuels also release particulate matter into the air, which can lead to heart attacks, strokes, lung cancer, and other diseases.
The use of fossil fuels has led to air and water pollution, as well as global warming. They are a non-renewable resource, and if we continue to use large amounts, they will eventually run out. The cost to society of fossil fuels is much higher than their market price, and there have been calls to switch to renewable energy sources.
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Frequently asked questions
Yes, fossil fuels are burned to generate electricity.
Fossil fuels are burned to create heat, which is used to generate steam. This steam drives a turbine, which generates electricity.
Burning fossil fuels releases harmful pollutants, such as nitrogen oxides and sulfur dioxide, which can lead to acid rain and cause various diseases. It also contributes to climate change by producing large amounts of carbon dioxide.
Yes, renewable energy sources such as solar, wind, and hydropower, as well as nuclear energy, are all used to generate electricity.
In 2023, about 60% of electricity generation in the US was from fossil fuels, mainly coal, natural gas, and petroleum.
