Mercedes Mullins
Coal has been a vital source of energy for centuries, powering economies and fuelling industrial revolutions worldwide. Despite the environmental concerns associated with its use, coal offers several advantages over other fossil fuels. This paragraph will introduce three key benefits of coal: its abundance and resulting economic benefits, its affordability, and its reliability as a source of electricity.
| Characteristics | Values |
|---|---|
| Abundance | Coal is the most abundant source of electricity worldwide, currently providing more than 36% of global electricity. In the US, coal is the most abundant energy source, constituting nearly 90% of all fossil fuel reserves. |
| Affordability | Coal is much cheaper compared to other fossil fuels like natural gas and petroleum. The weighted cost of coal between 2012 and 2022 was around $2 per MMBtu. |
| Energy density | Coal has a much higher energy density than renewable energy sources such as wind and solar. |
| Reliability | Coal-fired power plants provide reliable and constant power that is available on demand to meet energy consumption needs. |
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What You'll Learn
Coal is abundant, reliable, and affordable
Coal is an abundant fuel source that is relatively inexpensive to produce and convert to useful energy. Coal-fired power plants provide affordable, reliable, and constant power that is available on demand to meet energy consumption needs.
Coal is abundant in the sense that it is widely available and accessible for energy production. In the United States, for example, coal is a "home-grown" energy source, with domestic mines accounting for almost all of the coal used to generate electricity. This stands in contrast to other important energy sources, such as nuclear and renewable energy, which often rely heavily on imported materials. The abundance of coal reserves and the ease of access to these reserves contribute to its reliability as an energy source.
The affordability of coal is influenced by several factors, including the cost of coal production, transportation, and the efficiency of coal-fired power plants. Coal is generally considered inexpensive to produce, especially in locations where coal beds are thick and near the surface, such as in Wyoming. The delivered price of coal includes not only the cost of mining but also the cost of transportation to consumers. Additionally, the efficiency of coal-fired power plants plays a role in the overall affordability of coal as an energy source. By improving the efficiency of these plants, the amount of coal burned per unit of energy produced can be reduced, leading to cost savings.
The reliability of coal as an energy source is tied to its abundance and the ability to meet energy demands. Coal-fired power plants provide a reliable source of constant power that can be quickly scaled up or down to meet changing energy needs. This reliability is particularly important in ensuring a consistent supply of electricity to support various aspects of modern life, including lighting, heating, and powering equipment and machinery.
While coal has been a key component in the advancement of global communities, it is important to acknowledge the environmental impacts associated with its production and use. Efforts are being made to address these concerns, including the development of technologies to remove impurities, improve energy efficiency, and reduce emissions.
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Coal is a homegrown energy source
Coal is a "homegrown" energy source in the United States, with US mines providing virtually all of the coal used to generate electricity domestically. Coal is abundant in the US, constituting nearly 90% of all fossil fuel reserves in the country. The US also holds the world's richest coal reserve base, with over 260 billion tons. This ample availability leads to competitive pricing in the market, making coal a cost-effective option for electricity generation.
The longstanding use of coal in the US has also allowed for the development of efficient technologies and processes, resulting in higher efficiency levels and cost reductions. The infrastructure for coal mining, transportation, and power generation is well-established in the country. Coal-fired power plants provide affordable, reliable, and constant power that is available on demand to meet energy consumption needs.
However, it is important to note that coal mining and use have significant environmental impacts. Coal mining can lead to soil erosion, dust, and the disturbance of large tracts of land, affecting natural habitats and ecosystems. It can also cause water pollution and contamination, including acid mine drainage and the release of heavy metals into water sources. Coal-fired power plants are the dominant source of carbon dioxide emissions related to electricity generation, contributing to climate change.
While coal has been a vital source of energy for centuries, the shift towards renewable and cleaner energy sources has led to a decline in coal use in favor of nuclear, wind, and solar power. Nonetheless, coal continues to play a significant role in meeting critical energy needs, particularly in alleviating energy poverty worldwide.
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Coal has well-established infrastructure
Coal has a long history of use, with humans relying on it for electricity generation since 1882 and the opening of the Edison Electric Light Station. In the time since, coal infrastructure—including mining, transportation, and utilisation for power—has become widespread and well-established.
Coal-fired power plants provide affordable, reliable, and constant power that is available on demand to meet energy consumption needs. This is especially important for base load power, or the minimum amount of power needed to supply an electrical grid. Coal is also a "homegrown" energy source in the US, with US mines accounting for all of the coal used to provide electricity domestically. This is in contrast to other important energy sources, such as nuclear and renewable energy, which are heavily reliant on imported minerals.
The affordability of coal is due in part to its abundance. Coal is far more plentiful than oil or gas, with coal reserves worldwide in 2018 accounting for 132 years of production. The US holds the world's richest coal reserve base, with over 260 billion tons. This abundance keeps the cost of coal relatively low, with the weighted cost between 2012 and 2022 at around $2 per MMBtu (Million British Thermal Units).
Coal is also important for industries beyond energy production. The cement industry, for example, consumes around 4% of global coal production. Coal is also used in alumina refineries, paper manufacturing, and the chemical and pharmaceutical industries. Thousands of products have coal or coal by-products as components, including soap, plastics, and fibres.
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Coal can be converted into other forms of fuel
Direct liquefaction involves exposing coal directly to hydrogen at high temperatures (approximately 450-470°C) and high pressures (14000-20000 kPa) in the presence of a solvent that breaks down the hydrocarbon structure. This process chemically transforms coal into liquid products and results in only the partial dismantling of the coal structure.
Indirect liquefaction, on the other hand, requires an intermediate step of gasifying the solid coal to form synthesis gas (syngas), a mixture of carbon monoxide and hydrogen. This syngas is then converted into liquid fuels through processes such as the Fischer-Tropsch (FT) synthesis. Indirect liquefaction results in the complete dismantling of the coal structure.
Coal liquefaction has been used historically, particularly in countries lacking domestic oil reserves, such as Germany during World War II, where it played an important role in fuelling the war effort. It also became a significant part of South Africa's economy, providing around 30% of its domestic fuel demand.
Today, coal liquefaction continues to be explored as a way to create conventional energy worldwide. It offers an alternative to conventional petroleum-derived fuels and can be refined into gasoline and diesel fuel. However, it is important to note that coal liquefaction processes are typically associated with significant CO2 emissions.
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Coal creates jobs and stimulates economic growth
Coal has been a significant driver of economic growth and job creation, particularly during the Industrial Revolution. The use of coal as a cheap energy source enabled the large-scale production of iron, with annual production in Britain increasing from 2,500 tonnes per annum in the 1700s to 2.5 million by 1850. This transformation in the iron industry illustrates coal's role in stimulating economic development.
Coal-dependent regions, often specialised "mono-industry" areas, have economies and local identities closely tied to the coal value chain. As such, the coal industry provides numerous job opportunities, with over 36,000 people employed in the coal sector in the United States as of 2023. The infrastructure for mining, transporting, and utilising coal for power is well-established, further contributing to job creation and economic growth.
Moreover, coal is relatively inexpensive compared to other fossil fuels like natural gas and petroleum. Its low cost makes it an attractive option for generating baseload power, which refers to the minimum amount of power needed to supply an electrical grid. Coal-fired power plants are designed to run continuously, making them suitable for this purpose. The affordability of coal contributes to economic growth by providing a cost-effective energy source for industries and households.
However, it is important to acknowledge the environmental impact of coal. Coal is a fossil fuel that emits significant greenhouse gases when burned, contributing to climate change. The transition to renewable energy sources and the development of low-emission technologies are crucial steps towards reducing the environmental footprint of energy production. Nevertheless, the continued reliance on coal in emerging economies and the advancement of industrial uses, such as in the steelmaking, cement, and fuel industries, highlight coal's ongoing role in economic growth and job creation.
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