Umair Gaines
Electricity is a secondary energy source, meaning it must be generated through primary sources. The three major categories of energy for electricity generation are fossil fuels, nuclear energy, and renewable energy. Fossil fuels, such as coal, natural gas, and petroleum, are currently the leading source of electricity production in the US, but renewable energy sources are on the rise, with wind energy, hydropower, solar photovoltaics, and geothermal power plants all contributing to the generation of electricity. Nuclear energy is also a significant source of electricity, with nuclear power plants using atomic chain reactions to produce steam and generate electricity.
| Characteristics | Values |
|---|---|
| Basic Sources of Electricity | Wind, sunlight, coal, natural gas, nuclear fission reactions, hydropower |
| Fossil Fuels | Coal, natural gas, petroleum |
| Renewable Energy Sources | Solar energy, geothermal energy, wind energy, hydropower, biomass, tidal energy |
| Non-Renewable Energy Sources | Coal, oil, natural gas, petroleum, nuclear energy, hydrocarbon gas liquids |
| US Electricity Generation in 2023 | Renewable energy sources: 21%; Wind energy: 10%; Hydropower: 6%; Solar energy: 4%; Geothermal energy: less than 1% |
| US Electricity Generation in 2023 (cont.) | Nuclear energy: 18%; Petroleum: 0.4%; Other gases and sources: 0.5% |
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What You'll Learn
Fossil fuels: coal, natural gas, and petroleum
Fossil fuels, including coal, natural gas, and petroleum, have been the dominant source of electricity generation over the past century. In 2017, fossil fuels generated 64.5% of electricity worldwide, with a slight increase from 61.9% in 1990. While there has been a strong growth in renewables, fossil fuels continue to be the dominant source of electricity worldwide.
Coal
Coal is a fossil fuel that is burned in power plants to generate heat, which is used to produce steam. This steam drives turbines, ultimately generating electricity. Coal is a non-renewable energy source that has been a significant contributor to electricity generation, but it also has environmental implications, including air pollution and carbon dioxide emissions.
Natural Gas
Natural gas, another fossil fuel, is collected from under the Earth's surface and transported through pipelines to power plants. In these plants, natural gas, which is primarily methane, undergoes a conversion process to generate electricity. This process involves using a boiler to produce steam that spins a turbine or employing a combustion turbine where pressurized gas turns the blades of a turbine. Natural gas is also used in combination with renewable sources like solar and wind power, providing backup power generation when needed.
Petroleum
Petroleum, derived from crude oil and other fossil fuel liquids, has been the most-consumed energy source in the United States historically. It serves multiple purposes, including propelling vehicles, heating buildings, and generating electricity. In power plants, distillate fuel oil, a type of petroleum, is used in diesel engines to produce electricity. Additionally, the petrochemical industry uses petroleum as a feedstock to manufacture plastics, polyurethane, solvents, and various other products.
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Renewable energy: solar, wind, hydropower
Solar, wind, and hydropower are three renewable sources of electricity that are crucial in the transition to a sustainable energy future.
Solar Energy
Solar energy is the radiation from the Sun capable of producing heat, causing chemical reactions, or generating electricity. The potential for harnessing solar power is enormous, as the Earth receives about 200,000 times the world's total daily electric-generating capacity in solar energy daily. Solar energy can be converted into thermal energy (heat) or electrical energy through solar cells or photovoltaic cells. Flat-plate collectors are commonly used to capture solar energy for heating applications, while solar ponds can collect and store solar thermal energy. Solar ovens can also harness solar radiation for cooking.
Wind Energy
Wind energy is another renewable source of electricity that involves using wind turbines to convert the kinetic energy of the wind into electrical energy. Wind turbines are installed in all 50 states in the U.S., supplying more than 10% of the country's electricity. Wind energy has numerous advantages, including its renewability, affordability, and applicability in remote areas. Additionally, improvements in turbine technology have increased efficiency and addressed concerns related to material use, recyclability, and noise.
Hydropower
Hydropower, or hydroelectric power, is one of the oldest and largest sources of renewable energy. It uses the natural flow of moving water, often harnessed by dams, to generate electricity. Hydropower facilities can vary in size, from large dams like the Hoover Dam to smaller, damless facilities that channel part of a stream through a powerhouse. This renewable energy source is affordable, costing less than most other electricity sources, due to its long lifespan and reduced maintenance, operation, and fuel costs. Hydropower also provides additional benefits, such as flood control, irrigation support, and water supply.
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Nuclear energy
Nuclear power plants use pellets of enriched uranium fuel, containing approximately 3% U-235 encased in a ceramic matrix, to fuel their reactors. These pellets are aligned in linear arrays, known as fuel rods, interspersed with movable control rods that help regulate the nuclear reactions. The whole assembly, or reactor core, is submerged in water to keep it cool. There are two main types of reactors in use today: pressurised water reactors (PWR) and boiling water reactors (BWR). In a pressurised water reactor, the high pressure prevents the water from boiling, and it is carried to a separate steam generator. In a boiling water reactor, the water boils due to the heat produced by nuclear fission and powers the turbine directly.
While nuclear energy has advantages in terms of reliability and low environmental impact, there are also challenges associated with the disposal of spent nuclear fuel, which is radioactive. Additionally, the design of nuclear power plants has varied across countries, impacting the ease of operating and maintaining these facilities. Nevertheless, with improving reactor designs and safety systems, nuclear energy is expected to remain an important clean energy resource in the future.
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Geothermal power
Binary cycle power plants operate on water at lower temperatures of about 225-360°F (107-182°C). They use the heat from the hot water to boil a working fluid, usually an organic compound with a low boiling point. The working fluid is vaporized in a heat exchanger and used to turn a turbine. The water is then injected back into the ground to be reheated. Binary cycle power plants have allowed for the development of enhanced geothermal systems over a much greater geographical range, as they can operate with temperature resources as low as 81 °C (178 °F).
Geothermal electricity generation is currently used in 26 countries, while geothermal heating is in use in 70 countries. As of 2019, worldwide geothermal power capacity amounts to 15.4 gigawatts (GW), of which 23.9% (3.68 GW) are installed in the United States.
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Batteries
The inner workings of a battery are intricate and fascinating. At its core, a battery consists of three main components: the anode, the cathode, and the electrolyte. The anode and cathode are the two terminals of the battery, made of different chemicals, typically metals. The electrolyte, which can be liquid, solid, or semi-solid, acts as a separator between the terminals and facilitates the flow of electrical charge.
The magic happens when these components interact through chemical reactions. During the discharge of electricity, the anode releases electrons to the negative terminal, while the cathode accepts these electrons, creating a flow of electrical energy. This flow of electrons, or electric current, is what powers our devices.
The electrolyte plays a crucial role in maintaining balance. It allows the flow of charged ions, which move in the opposite direction of the electrons, ensuring the system remains stable. This intricate dance of electrons and ions is what gives batteries their functionality. Additionally, some batteries are designed to be rechargeable, allowing the chemical reactions to be reversed by sending energy back into the battery, resetting it for another cycle.
Over the years, batteries have undergone significant advancements, with scientists continually working to enhance their efficiency, safety, and capacity. The development of lithium-ion batteries, recognised by the 2019 Nobel Prize in Chemistry, is a testament to the ongoing progress in battery technology.
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Frequently asked questions
The six basic sources of electricity can be divided into renewable and non-renewable sources. Renewable sources include solar energy, wind energy, and hydropower. Non-renewable sources include fossil fuels, nuclear energy, and natural gas.
In addition to solar energy, wind energy, and hydropower, other examples of renewable sources of electricity include geothermal energy, biomass, and tidal energy. Renewable sources of energy are naturally replenished and safe for the environment.
Aside from fossil fuels, nuclear energy, and natural gas, other examples of non-renewable sources of electricity include coal, oil, and petroleum. These sources take millions of years to replenish and are found underneath the Earth's surface.
