Trystan Casey
Electricity is central to many parts of life in modern societies, and its role is expanding with the growing use of electric vehicles and heat pumps. Power generation is the largest source of CO2 emissions globally, and most electricity is still generated from fossil fuels, predominantly coal and natural gas. However, the sector is also leading the transition to net-zero emissions through the increasing use of renewable energy sources such as solar, wind, hydropower, biomass, and geothermal power. In 2022, renewable sources provided about 21% of the United States' electricity. The basic process of electricity generation, discovered by British scientist Michael Faraday in the 1820s and 1830s, involves using electromechanical generators driven by heat engines fueled by combustion, nuclear fission, or other means such as the kinetic energy of flowing water and wind.
| Characteristics | Values |
|---|---|
| Year | 2023 |
| Global Electricity Generation | 60% from fossil fuels, 19% from nuclear energy, 21% from renewable energy sources |
| US Electricity Generation | 41% from coal, 23% from natural gas, 19% from nuclear energy, 17% from renewable energy sources |
| Electricity Generation Methods | Fossil fuels, nuclear fuels, renewable energy |
| Fossil Fuels | Coal, natural gas, petroleum, and other gases |
| Renewable Energy Sources | Wind, hydropower, solar power, biomass, geothermal |
| Electricity Generation Technologies | Steam boilers, combustion turbines, combined cycle power plants, nuclear power plants, wind turbines, hydropower |
| Electricity Transmission | High-voltage transmission lines, substations, transformers |
| Electricity Demand | Varies depending on the time of day and year |
| Electricity Storage | Pumped storage, batteries |
| Low-Carbon Electricity Sources | Hydropower, nuclear, wind, solar |
| Global Electricity Production | 11,000 utility-scale power plants |
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What You'll Learn
Fossil fuels
Coal is the most abundant and widely used fossil fuel for electricity generation due to its relatively low cost. However, it also emits the highest levels of carbon dioxide (CO2) and other greenhouse gases, contributing significantly to climate change. In 2016, coal accounted for 67.8% of Canada's electricity generation greenhouse gas emissions, while natural gas contributed 28.9%, and oil and diesel contributed 3.2%.
The use of fossil fuels for electricity generation has had a significant impact on the progress and development of our society. For many decades, electricity was made possible primarily through the use of fossil fuels, especially during the Industrial Revolution, which improved the quality of life worldwide. Additionally, many developing countries continue to rely heavily on fossil fuels for their energy needs.
However, there are several drawbacks to using fossil fuels. Firstly, burning fossil fuels releases carbon dioxide and other greenhouse gases into the atmosphere, contributing to climate change. Electricity generation accounts for about 25% of global emissions. Secondly, fossil fuels are not as efficient as other sources of energy. For example, coal-fired plants have a typical thermal efficiency of around 37%, while combined-cycle gas-fired plants range from 56% to 60%. Finally, the cost to society of using fossil fuels is much higher than their market price, considering the environmental and health impacts.
To address the issues associated with fossil fuels, there has been a growing focus on transitioning to low-carbon sources of electricity, such as nuclear and renewable energy options. However, the balance between fossil fuels and low-carbon electricity sources has remained relatively unchanged over the past few decades. As of 2020, more than a third of global electricity comes from low-carbon sources, while fossil fuels still account for the majority.
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Nuclear power
During nuclear fission, a neutron collides with a larger atom, causing it to split into two smaller atoms, known as fission products. This process releases a substantial amount of energy in the form of heat. The heat produced during atomic fission is used to boil water and generate pressurized steam. This steam is directed through a reactor steam system, spinning large turbine blades connected to magnetic generators, ultimately producing electricity.
The output of a nuclear reactor can be controlled through various methods, including adjusting the circulation volume of water in the reactor vessel and using control rods containing boron to absorb neutrons and regulate nuclear fission. The electricity generated in nuclear power plants is transmitted via transmission grids, which distribute power to regional and local grids for final consumption.
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Renewable energy
One of the most prominent sources of renewable energy is wind power. Wind energy has been used for millennia, and modern wind farms use large wind turbines located onshore or offshore to harness the kinetic energy of moving air. The spinning blades of these turbines convert kinetic energy into electric energy, which is then fed into the national grid. Wind power is the largest producer of renewable electricity in the UK and the US, with top wind power states including California, Iowa, Kansas, Oklahoma, and Texas. Offshore wind power, in particular, offers tremendous potential.
Solar power is another significant form of renewable energy. Solar panels capture sunlight through a joint chemical and physical reaction known as the photovoltaic effect. This process generates electricity by charging electrons. Solar energy is the most abundant energy resource and can be harnessed even in cloudy weather. However, the amount of sunlight received can vary depending on location, season, and time of day.
Hydropower is also an important renewable energy source, especially in the United States, where it is currently the largest source of renewable energy in the electricity sector. Hydropower relies on stable rainfall patterns and the force of water to spin turbine blades and generate electricity. However, it can be negatively impacted by climate-induced droughts and changes to ecosystems. Small-scale hydro is often considered more environmentally friendly, as large hydroelectric dams can have adverse effects on ecosystems and restrict access for humans and animals.
Other renewable energy sources include bioenergy or biomass, where organic matter is burned as fuel. While this process emits carbon dioxide, these fuel sources are considered renewable because they can be regrown, and they absorb as much carbon as they emit over their lifespans. However, bioenergy should be used cautiously due to potential negative environmental impacts related to deforestation and land-use changes.
The use of renewable energy is increasingly displacing "dirty" fossil fuels, offering the benefit of lower emissions. With the expansion of renewable sources, a key goal is to modernize electricity grids to make them smarter and more secure. This includes improving energy storage technologies to align renewable energy generation with periods of higher electricity demand.
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Solar power
Solar panels are made from silicon or another semiconductor material installed in a metal panel frame with a glass casing. When the sun shines on a solar panel, the photons of sunlight (small packets of energy) are absorbed by the PV cells in the panel. This absorption releases electrons, creating an electric charge. This charge creates an electric current, which is captured by the wiring in the solar panels. This direct current (DC) electricity is then converted to alternating current (AC) by an inverter. AC is the type of electrical current used when plugging appliances into normal wall sockets.
The rate at which solar panels generate electricity depends on the amount of direct sunlight and the quality, size, number, and location of the panels in use. The more sunlight that reaches the panels, the more energy they generate, meaning they produce varying amounts of electricity at different times of the day and year. Solar panels can be installed on residential rooftops or in solar farms stretching over acres of rural land.
Solar energy is a clean, renewable, and increasingly popular energy source. It has been used by humans since at least the 7th century BC, and today it powers satellites and spacecraft orbiting Earth. As of 2022, China is the largest producer of solar-powered electricity, with the US, Japan, Germany, and India also being major producers. The US government has invested $82 million in technologies to integrate solar energy into the grid, and the UK government has expressed its ambition to increase solar generation by up to 70 gigawatts by 2035.
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Hydropower
The process of generating electricity from hydropower typically involves the use of turbines and generators. Water flows through a pipe, or penstock, and pushes against or spins the blades of a turbine, which then powers a generator to produce electricity. This process is used in most conventional hydroelectric facilities, including run-of-the-river systems and pumped storage systems. Run-of-the-river systems utilise the natural flow of a river to apply pressure on a turbine, while storage systems involve the use of reservoirs created by dams to release water through hydro turbines as needed. Pumped-storage hydropower facilities pump water to higher elevations during periods of low demand and release the stored water during peak demand to generate electricity.
The first industrial use of hydropower to generate electricity in the United States was in 1880 at the Wolverine Chair Factory in Grand Rapids, Michigan. Today, there are about 1,450 conventional and 40 pumped-storage hydropower plants operating in the United States, with the largest being the Grand Coulee hydro dam on the Columbia River in Washington State. Hydropower has also played a significant role in the development of the factory system and modern employment practices.
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Frequently asked questions
Most electricity is generated by burning fossil fuels such as coal and natural gas.
Other sources of electricity generation include nuclear power, solar power, wind power, hydropower, biomass, and geothermal power.
Fossil fuels are burned to produce heat, which creates steam that turns turbines to generate electricity.
Nuclear power plants use nuclear reactions to produce steam, which turns turbines to generate electricity, similar to how steam boilers work.
Wind power uses the kinetic energy of wind to turn turbines, while solar power uses solar panels to absorb light energy from the sun, charging electrons to generate electricity.
