Wiktor Wise
Electricity in the United States is generated using a variety of resources, with natural gas, coal, and nuclear power being the most common. Fossil fuels, mainly coal and natural gas, remain the backbone of electricity generation, accounting for 63.1% of installed generation capacity in 2022. However, there has been a shift from coal to gas, and renewable resources such as wind and solar are among the fastest-growing sources of electricity. Nuclear power has also seen renewed interest, with applications submitted for the construction of new nuclear power reactors. The US also imports and exports electricity, and its generation and consumption have environmental impacts that depend on the sources of generation available in each area.
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What You'll Learn
Fossil fuels
The US has historically relied heavily on fossil fuels, particularly coal, for its electricity generation. However, in recent years, there has been a shift away from coal towards natural gas. This shift has been driven by the deregulation of the electricity market, which has allowed new entrants to proliferate, as well as the retirement of old coal units due to age and changing policies. Despite this shift, the US remains tied to fossil fuels, with gas making up the majority of planned new power capacity.
Petroleum, while a significant energy source for the transportation sector, accounts for a small proportion of electricity generation, at about 0.4% in 2023. Other fossil fuel sources, such as residual fuel oil, distillate fuel oil, and blast furnace gas, are also used in steam turbines and gas turbines for electricity generation.
The use of fossil fuels for electricity generation has climate implications. While the shift from coal to natural gas has helped reduce CO2 emissions, this may be offset by methane leaks during production and transport. As a result, the continued reliance on fossil fuels presents challenges for the US in terms of reducing its carbon footprint and transitioning to cleaner energy sources.
Overall, fossil fuels continue to play a significant role in electricity generation in the US, with efforts being made to transition to renewable energy sources and reduce emissions.
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Nuclear power
The US nuclear fleet is operated by 30 different power companies across 30 states. The average capacity factor of these plants has increased over time, rising from 50% in the early 1970s to a record 94% in 2019. This high capacity has helped nuclear power maintain its significant contribution to US electricity generation.
The development of nuclear power in the US began in the 1950s, with the first controlled nuclear chain reaction initiated in 1942 under the bleachers of a football stadium at the University of Chicago by Dr. Enrico Fermi. In 1951, the first usable amount of electrical power was generated from nuclear fission at the Experimental Breeder Reactor I (EBR-I) in Idaho. This reactor produced enough electricity to power the entire EBR complex. The development of nuclear power for naval propulsion also played a significant role in the early years, with the first naval model of the Pressurized Water Reactor (PWR) installed in the submarine USS Nautilus, enabling it to operate underwater full-time.
In recent years, there has been a decline in the number of reactors, with no new construction starts between 1977 and 2013. This was due to economic factors, with gas generation considered more attractive, and opposition to construction projects, compounded by safety concerns following the Three Mile Island accident in 1979. However, in 2012, the US Nuclear Regulatory Commission approved the construction of four new reactors, and in 2023, the Vogtle plant in Georgia became the largest nuclear power plant in the US with four reactors and a total generation capacity of 4,536 MW.
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Renewable energy sources
Wind energy was the source of about 10% of total US utility-scale electricity generation in 2023, accounting for 48% of the electricity generated from renewable sources. Wind turbines convert wind energy into electricity, and wind power research dates back to the 1970s when NASA developed an analytical model to predict wind turbine power generation during high winds. Today, several organizations have programs dedicated to wind research, focusing on improving power production, reducing capital costs, and making wind energy more cost-effective.
Hydropower plants, which use flowing water to spin a turbine connected to a generator, produced about 6% of total US utility-scale electricity generation in 2023 and accounted for about 27% of utility-scale electricity generation from renewable sources. Hydroelectric power was the largest producer of renewable power in the US until 2019 when it was overtaken by wind power.
Solar photovoltaic and solar thermal power plants provided about 4% of total US electricity generation in 2023. Solar capacity has grown at an average of 22% annually over the last decade, and solar energy is expected to meet 33% of US electricity demand by 2050, leading to an 18% decrease in electricity sector GHG emissions. Biomass, which is derived from plant materials and can be burned directly in steam-electric power plants, accounted for about 1% of total US utility-scale electricity generation in 2023 and 5% of utility-scale electricity generation from renewable sources.
Geothermal power plants, which use hydrothermal resources like steam and hot water from deep underground, produced less than 1% of total US electricity generation. Ground source heat pumps (GSHP) can extract heat from shallow ground and are used to provide heating and cooling in the residential sector.
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Oil and gas
The United States uses a diverse range of energy sources and technologies to generate electricity, including fossil fuels, nuclear energy, and renewable energy sources. In 2023, about 60% of electricity generation in the US came from fossil fuels, with natural gas and petroleum being significant sources.
Petroleum, also known as crude oil, is a major energy source globally and plays a role in electricity generation in the US. In 2023, petroleum accounted for about 38% of the nation's energy production and about 0.4% of US electricity generation. Petroleum products such as residual fuel oil, distillate fuel oil, and petroleum coke are used in steam turbines, internal combustion engines, and gas turbines to generate electricity.
Natural gas is another crucial component of the US energy mix. In 2023, natural gas accounted for 36% of the country's energy production. It has become the dominant source for electricity generation, overtaking coal in 2016. Improvements in fracking have allowed natural gas production to increase significantly, contributing to the shift away from coal.
While oil and gas are essential components of the US energy landscape, there is a growing trend towards renewable energy sources. In 2023, renewable energy sources, including wind, solar, hydro, biomass, and geothermal, accounted for about 21% of total US utility-scale electricity generation. This marks a significant shift towards cleaner and more sustainable energy sources, with wind and solar power leading the way in renewable electricity capacity additions.
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Coal
The decline in coal usage can be attributed to several factors, including the increased availability and decreased cost of natural gas, the rise of renewable energy sources, and stricter environmental regulations. The US Environmental Protection Agency's implementation of the Cross-State Air Pollution Rule and Mercury and Air Toxics Standards have played a significant role in reducing coal-fired power plants and incentivizing the transition to cleaner energy sources.
The shift away from coal has had both positive and negative impacts. On the one hand, it has contributed to reducing CO2 emissions from the power sector. On the other hand, it has led to continued reliance on fossil fuels, as natural gas remains a dominant source of electricity generation, and there are concerns about methane leaks during production and transport.
Despite the overall decline in coal usage, coal-fired power plants continue to operate in the US, and coal remains a significant source of electricity generation. In 2024, there were still over 200 coal-powered units across the country. The future of coal-fired power plants in the US is uncertain, and environmentalists advocate for political action to accelerate the closure of these plants to mitigate climate change effectively.
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Frequently asked questions
The three major categories of energy for electricity generation in the US are fossil fuels (coal, natural gas, and petroleum), nuclear energy, and renewable energy. Fossil fuels remain the backbone of electricity generation, accounting for 63.1% of installed generation capacity in 2022.
Renewable energy sources used in the US include wind, hydropower, solar power, biomass, and geothermal. In 2023, wind energy accounted for about 10% of total US utility-scale electricity generation, while solar photovoltaic and solar thermal power plants provided about 4%.
The US electricity generation mix has evolved over time. There has been a shift from coal to natural gas due to the shale gas revolution and changing policies. While coal used to be a major source of electricity, natural gas has become more prominent due to its lower cost. Additionally, there is a growing interest in nuclear power, with applications submitted for constructing new nuclear power reactors.
Electricity generation in the US has environmental implications, particularly due to the use of fossil fuels. The burning of fuels can lead to emissions of greenhouse gases and other air pollutants. However, the shift from coal to gas has helped reduce CO2 emissions, although this may be offset by methane leaks during production and transport.
