Otis Singleton
Electricity is essential to modern life, with its role expanding as electric vehicles and heat pumps become more widespread. Power generation is the largest source of CO2 emissions, but it's also leading the transition to net zero through the adoption of renewable energy sources. The main sources of electricity are fossil fuels, nuclear energy, and renewable energy. Fossil fuels, such as coal, oil, and natural gas, are still the dominant source of electricity globally, but renewables like hydropower, solar, wind, and bioenergy are gaining traction. Nuclear power is also an important low-emission source, providing about 10% of the world's electricity. The balance between these sources is crucial to meeting the growing demand for sustainable energy and addressing climate change.
| Characteristics | Values |
|---|---|
| Main Source | Fossil fuels |
| Other Sources | Nuclear energy, renewables |
| Examples of Fossil Fuels | Coal, natural gas, oil, petroleum |
| Examples of Renewables | Hydropower, solar, wind, geothermal, biomass, wave, tidal |
| Global Electricity Generation by Fossil Fuels in 2017 | 64.5% |
| Global Electricity Generation by Fossil Fuels in 2022 | Over 60% |
| Global Electricity Generation by Renewables in 2022 | All-time high of over 8,500 TWh |
| Global Electricity Generation by Nuclear Energy in 2022 | 10% |
| Hydropower's Share of Global Electricity Generation in 2017 | 16% |
| U.S. Electricity Generation by Natural Gas in 2023 | 43% |
| U.S. Electricity Generation by Coal in 2023 | 16% |
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What You'll Learn
Fossil fuels
Fossil fuel power stations use machines to convert the heat energy of combustion into mechanical energy, which then powers an electrical generator. The efficiency of these power stations is limited by the Carnot efficiency, and they produce waste heat. The typical thermal efficiency for coal and oil-fired plants is around 37%, while combined-cycle gas-fired plants can achieve 56-60% efficiency. Fossil fuel power plants are complex systems, and multiple generating units may be built at a single site to improve efficiency.
Coal is the largest source of electricity globally and remains dominant in many countries. However, some countries, like the UK, have significantly reduced their reliance on coal in recent years. Natural gas is the second-largest source of electricity production globally, and its use has increased due to high natural gas prices. Oil, once a significant energy source for electricity generation, has been largely replaced by coal and natural gas due to price increases. However, it remains important for diesel engine power plants in isolated communities.
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Nuclear power
While nuclear power has faced some setbacks and public skepticism, it remains an important part of the global energy mix. It is a reliable source of low-carbon electricity, and its use is expected to increase in the coming decades as countries strive for net-zero emissions. Nuclear power is an essential component of the transition to cleaner energy sources, and its development and optimization continue to be a focus of the energy sector.
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Renewable energy
Hydropower is currently the world's largest source of renewable electricity, generating more than all other renewable technologies combined. It is expected to remain the largest source of renewable electricity into the 2030s. However, hydropower output has been affected by drought conditions in several regions, including China, Europe, and the United States. Solar photovoltaics and wind power are also driving the growth in renewable energy supply, with wind being the leading non-hydro renewable technology.
Modern bioenergy is the largest source of renewable energy globally, with a share of over 50% of global use in 2023. Other renewable heat sources, such as geothermal plants and solar heaters, will also play a significant role in decarbonizing the heating sector. The increase in renewables as a share of energy supply in 2022 was the second largest in history, but faster increases are needed to meet decarbonization targets.
The development and deployment of renewable energy technologies are crucial in addressing climate change and reducing carbon emissions. Power generation is currently the largest source of CO2 emissions globally, and the transition to renewable sources of electricity is a key part of the energy transition. The electrification of transport and heating, as well as the increasing use of electric vehicles and heat pumps, are expanding the role of electricity in modern societies.
While renewable energy sources are making significant contributions to the global energy mix, the majority of global electricity is still generated from fossil fuels, predominantly coal and gas. Nuclear power is also an important low-emission source of electricity, providing about 10% of global electricity generation. However, the decline in nuclear energy has offset some of the progress made in renewables.
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Hydropower
The use of hydropower has several advantages. Once a hydroelectric complex is constructed, it produces no direct waste and emits significantly less greenhouse gas compared to fossil fuel-powered energy plants. Hydropower also offers benefits beyond electricity generation, such as flood control, irrigation support, and water supply.
However, there are some challenges and limitations associated with hydropower. The construction of dams and reservoirs can have environmental impacts, particularly when built in lowland rainforest areas, where the inundation of forests may lead to substantial greenhouse gas emissions. Additionally, the permitting and construction times for hydropower projects can be lengthy, limiting their potential for expansion.
Despite these challenges, hydropower remains a significant contributor to the world's electricity supply and is expected to continue playing a crucial role in the transition to renewable and low-carbon energy sources.
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Solar and wind
Solar energy is generated by capturing sunlight and converting it into electricity. This can be done through the use of solar panels, which are typically made up of photovoltaic cells that convert sunlight directly into electricity. Solar energy is a clean and sustainable source of electricity, as it does not produce heat-trapping gases or other air pollutants. In 2023, the US generated 238,121 gigawatt-hours (GWh) of electricity from solar energy, more than eight times the amount produced in 2014.
Wind energy is generated by using wind turbines to capture the power of the wind and convert it into electricity. Wind turbines work by using the kinetic energy of the wind to turn a propeller, which then spins a generator to produce electricity. Wind energy is also a clean and sustainable source of electricity, as it does not produce any emissions or pollutants. In 2023, wind installations across the US produced 425,325 GWh of electricity, more than doubling the amount generated a decade earlier.
Together, solar and wind energy are making significant contributions to the global electricity mix. In 2024, the share of wind and solar in global power generation rose to 15%, with particularly high levels in the Netherlands (45%) and Denmark (70%). In the US, solar and wind energy combined generated enough electricity in 2023 to power more than 61 million average American homes.
The growth in solar and wind energy is being driven by efforts to address climate change and transition to net-zero emissions. As a result, there is a dramatic transformation of power systems globally, with a massive increase in power demand and the need to generate electricity from renewable sources. However, it is important to note that the majority of global electricity is still generated from fossil fuels, predominantly coal and gas.
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Frequently asked questions
The main source of electricity varies by country. In the US, natural gas is the top source, providing about 43% of US utility-scale electricity generation in 2023. Globally, fossil fuels are the predominant source of electricity, with coal and gas accounting for more than double the share of nuclear and renewable sources combined.
In addition to natural gas, other sources of electricity in the US include coal, petroleum, biomass, geothermal, solar, wind, hydro, and nuclear power.
The four main sources of renewable energy in the UK are wind, solar, hydropower, and bioenergy. Other renewable sources include geothermal power and biomass.
Non-renewable sources of electricity include coal, fossil fuels, and nuclear power.
