Otis Singleton
Electricity is a secondary energy source, converted from primary sources like fossil fuels, nuclear energy, and renewable energy. The majority of electricity is still generated from fossil fuels, predominantly coal and natural gas. However, there is a growing trend towards renewable sources, such as wind, solar, hydropower, and geothermal energy, which are increasingly being deployed to address climate change and reduce emissions. Nuclear energy also plays a significant role in the electricity mix, particularly in low-carbon electricity production. The specific sources of electricity vary across countries and regions, with some experiencing dramatic shifts, such as the UK's decline in coal usage.
| Characteristics | Values |
|---|---|
| Major Sources of Electricity | Fossil Fuels, Nuclear Energy, Renewable Energy |
| Fossil Fuels | Coal, Natural Gas, Petroleum, Oil |
| Nuclear Energy | Nuclear Power Plants |
| Renewable Energy | Wind Energy, Hydropower, Solar Photovoltaic, Biomass, Geothermal |
| Largest Sources of Electricity | Fossil Fuels (Coal, Gas), Hydropower, Nuclear |
| US Electricity Generation in 2023 | Fossil Fuels (60%), Nuclear Energy (19%), Renewable Energy (21%) |
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Fossil fuels
Coal is the most abundant and widely used fossil fuel for electricity generation due to its relatively low cost. However, it produces more greenhouse gas emissions and pollution compared to equivalent amounts of petroleum or natural gas. For instance, a 1000-MWe coal-fired power plant emits higher nuclear radiation doses than a natural gas-fired plant. As of 2019, carbon capture and storage of emissions were not economically viable for fossil fuel power plants.
Oil, another fossil fuel, has historically been a significant source of energy for electricity generation. However, after the oil price increases in the 1970s, its use declined, and coal and natural gas became more prominent. Today, oil accounts for a small share of electricity production, mainly used in diesel engine power plants in isolated communities not connected to a grid. Distillate oil, or diesel fuel, is burned in internal combustion engines.
Natural gas plants, on the other hand, use gas turbines instead of steam turbines for electricity generation. Natural gas combusts in the presence of air, and per unit of electric energy, it emits less carbon dioxide than coal. Nevertheless, the use of fossil fuels for electricity generation needs to be reduced, as they are the largest source of global carbon dioxide emissions.
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Nuclear energy
The development of nuclear energy for peaceful purposes has been supported by organizations such as the International Atomic Energy Agency (IAEA), which administers a reserve of low-enriched uranium in Kazakhstan for countries in urgent need. The IAEA also provides guidance on the activities necessary during the lifetime of nuclear energy production, from the mining of uranium to the construction, maintenance, and decommissioning of nuclear power plants and the management of nuclear waste.
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Renewable energy
In the UK, the four main sources of renewable energy are wind power, solar power, bioenergy, and hydropower. Wind power is the largest producer of renewable electricity in the UK and the US. Onshore and offshore wind farms generate electricity by spinning the blades of wind turbines, which convert kinetic energy into electric energy. This electricity is then converted into higher voltages and fed into the national grid.
Solar power, another abundant renewable energy source, generates electricity by capturing sunlight on solar panels through a joint chemical and physical reaction known as the photovoltaic effect (PV). Solar technologies can deliver heat, cooling, natural lighting, electricity, and fuels. The cost of manufacturing solar panels has decreased dramatically in recent years, making them an affordable and clean energy option.
Bioenergy is generated by burning organic matter as fuel, including plants, timber, and food waste. These sources are considered renewable because they can be regrown and absorb as much carbon as they emit over their lifecycles. However, recent studies show that some forms of biomass, especially from forests, produce higher carbon emissions than fossil fuels.
Hydropower, the largest renewable energy source for electricity globally, harnesses the energy of water moving from higher to lower elevations in reservoirs and rivers. While hydropower provides multiple benefits, it relies on stable rainfall patterns and can be negatively impacted by climate-induced droughts or changes to ecosystems. Additionally, the infrastructure required for hydropower can have adverse effects on ecosystems.
Other renewable energy sources include geothermal energy, which utilizes the Earth's interior heat, and hydroelectric power, including tidal energy.
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Hydropower
There are two main types of hydropower systems: run-of-the-river and storage. In run-of-the-river systems, the force of the river's current applies pressure to a turbine. These facilities may have a weir in the watercourse to divert water flow to hydro turbines. In storage systems, water accumulates in reservoirs created by dams on streams and rivers and is released through hydro turbines as needed to generate electricity. Most U.S. hydropower facilities use storage systems with dams and reservoirs.
Pumped-storage hydropower facilities are a type of hydroelectric storage system where water is pumped from a water source up to a storage reservoir at a higher elevation. The water is then released from the upper reservoir to power hydro turbines located below. Pumped-storage facilities generally use more electricity to pump water to the upper reservoirs than they produce with the stored water, resulting in a net negative electricity generation balance. However, they can be used to generate electricity during peak demand periods when wholesale electricity prices are high.
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Wind and solar power
The major sources of electricity include fossil fuels (coal, natural gas, and petroleum), nuclear energy, and renewable energy. While fossil fuels still account for the majority of global electricity generation, low-carbon sources such as nuclear and renewable energy are becoming increasingly significant.
Wind power installations can be found both onshore and offshore, with the United States' wind power capacity currently being predominantly land-based. Wind turbines convert wind energy into electricity, powering homes and businesses. In 2023, wind energy accounted for about 10% of total U.S. utility-scale electricity generation and 48% of electricity generation from renewable sources.
Solar power, on the other hand, commonly uses photovoltaic solar systems to turn sunshine into electricity. These systems are prevalent in the United States, accounting for 97% of the country's solar capacity. Additionally, there are utility-scale concentrated solar systems that use mirrors to focus the sun's rays and generate electricity by heating a liquid. Solar power is the fastest-growing renewable source due to larger capacity additions and favorable tax credit policies. Between 2009 and 2019, the cost of installing new solar capacity decreased by 89%.
Both wind and solar power provide clean energy alternatives to fossil fuels, emitting fewer planet-heating gases. However, they face the challenge of intermittency, as they rely on variable natural sources. To address this issue, pairing renewables with storage systems is one proposed solution.
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Frequently asked questions
The three major sources of electricity are fossil fuels, nuclear energy, and renewable energy.
Fossil fuels include coal, natural gas, and petroleum. In 2017, these three fossil fuels combined accounted for about 77.6% of US primary energy production.
Renewable energy sources include wind, solar, geothermal, hydropower, and biomass.
