Umair Gaines
The United States' electricity sector is a complex system of interconnected grid networks, primarily powered by fossil fuels, nuclear energy, and renewable sources. In 2023, natural gas was the leading source of electricity generation, accounting for about 43% of the country's utility-scale electricity production. Coal, despite a decline in new coal plants, remains a significant contributor, along with nuclear power, which has a growing presence in the energy mix. Renewable sources, such as wind, solar, and hydropower, are also increasingly important, with wind energy alone contributing about 10% of total US electricity generation in 2023. The US electricity sector is constantly evolving, adapting to technological advancements, policy changes, and shifting energy demands.
| Characteristics | Values |
|---|---|
| Total electricity produced | 4,029 TWh in 2023 |
| Rank in the world | Second-largest producer |
| Portion of the electrical grid in North America | 1,280 GW nameplate capacity |
| Primary energy used | 34% |
| Dominant source for electricity generation | Natural gas |
| Percentage of electricity from natural gas | 38.9% in January |
| Percentage of electricity from coal | 20.7% in January 2025; 16% in 2023; 9% in 2023 |
| Percentage of electricity from nuclear energy | 17.9% in January; 8.3% in 2021; 9% in 2023 |
| Percentage of electricity from renewables | 21.5%; 9% in 2023 |
| Percentage of electricity from solar energy | 5.2% in January; 4% in 2023 |
| Percentage of electricity from wind energy | 10.9% in January |
| Percentage of electricity from hydroelectric power | 5.3% in January |
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What You'll Learn
Natural gas
The affordability, reliability, and local abundance of natural gas in the US have made it a key power generation resource. It is also more flexible than some renewable energy sources and nuclear power, as it can supply electricity at any time, including at times of peak demand. It has a smaller carbon footprint than coal, and its low price has encouraged a rapid growth in electricity generated from natural gas. In the decade from 2005 to 2015, electricity generated by natural gas increased by 574 billion kilowatt-hours, more than triple the increase of the second-fastest-growing source, wind energy.
The development of hydraulic fracturing techniques in the early 2000s allowed for the commercial production of shale gas. This, combined with the deregulation of gas power, led to a surge in new gas capacity from 2000 onwards. Since 2011, more than 100 coal-fired plants have been replaced or converted to natural gas, due to stricter emission standards, low natural gas prices, and more efficient natural gas turbine technology.
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Nuclear power
Despite the benefits of nuclear power, there are concerns and challenges surrounding its use. There has been a decline in the number of operating reactors in the US since the 1990s, and the construction of new nuclear power plants has faced opposition due to safety fears and the risk of nuclear proliferation. The demand for nuclear power softened in America in the early 2010s, and support for building new nuclear power plants dropped after the 2011 Fukushima nuclear accident in Japan. Additionally, there are challenges in the disposal of nuclear waste, with no country in the world currently operating a permanent deep geological facility for the safe disposal of nuclear waste, despite international consensus on the advisability of such sites.
However, nuclear power remains an important part of the US energy portfolio, especially as the country strives to reduce carbon emissions and address climate change. The US Department of Energy's Office of Nuclear Energy is focused on advancing nuclear power as a secure, low-carbon energy source that can contribute to meeting the nation's energy needs while enhancing national security.
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Coal
In recent years, coal's contribution to electricity generation in the US has been on a downward trajectory. In 2022, coal generated about 19.5% of the electricity at utility-scale facilities, a notable decrease from 38.6% in 2014 and 51% in 2001. This decline is attributed to the growing preference for cheaper and cleaner alternatives, such as natural gas and renewable energy sources. Additionally, there has been increasing public and political opposition to coal-fired power plants due to environmental concerns, with organisations like the American Wind Energy Association advocating for renewable energy.
The shift away from coal has been further influenced by state-level initiatives. For example, Maine passed legislation in 2008 to minimise carbon dioxide emissions from new coal-powered facilities, and Oregon approved a plan in 2016 to stop investing in out-of-state coal plants by 2030. Additionally, Colorado's largest utility company, Xcel Energy, aims to phase out coal-burning power plants by 2030, and Maryland's renewable energy requirements have significantly reduced coal's role in the state's electricity mix.
Despite the overall decline, coal remains a significant energy source for electricity generation in certain states. Wyoming, for instance, still relies heavily on coal, although alternative sources of power are gradually gaining traction. In 2023, coal was the fourth-highest energy source for US electricity generation, contributing about 16% of the total. While coal plants have been closing due to environmental and economic factors, utilities still purchase over 90% of the coal consumed in the United States, indicating its continued, albeit diminishing, role in the country's energy landscape.
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Wind and solar
Solar energy is also becoming an increasingly significant contributor to US electricity generation. In 2023, solar photovoltaic and solar thermal power plants provided about 4% of total US utility-scale electricity, with almost all solar electric generation coming from photovoltaic systems (PV). PV conversion produces electricity directly from sunlight using a photovoltaic cell. California produced the highest percentage of its electricity from solar power in January 2025. The US Energy Information Administration (EIA) estimates that small-scale solar photovoltaic systems generated about 0.07 trillion kWh of electricity in 2023, with an additional 73.62 billion kWh coming from these systems.
The use of wind and solar energy varies across the US, with some states adopting these renewable energy sources more rapidly than others. State policies play a crucial role in encouraging the adoption of solar energy, while geographical factors also influence the deployment of wind and solar technologies. For instance, large thermal power plants are often located along state boundaries due to their reliance on water for cooling, drawn from the rivers that mark state lines.
While wind and solar energy currently account for a significant portion of US electricity generation, there is still room for growth. In 2023, renewable energy sources, including wind, solar, hydropower, and others, contributed to about 21% of total US utility-scale electricity generation. This marks a notable increase from 12% in 1990, indicating a positive trend towards a more sustainable energy mix in the country.
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Hydropower
Most hydroelectricity is produced at large dams built by the federal government, and many of the largest hydropower dams are in the western United States. The largest concentration of hydroelectric generation in the US is in the Columbia River basin, which, in 2012, was the source of 44% of the nation's hydroelectricity. The top five states in terms of conventional hydroelectricity generation in 2023 were Washington, California, Oregon, New York, and Alabama. These five states combined accounted for 61% of the national total. In 2023, Washington state derived about 60% of its electricity from hydropower, and Idaho and Oregon also rely heavily on hydropower.
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Frequently asked questions
In 2023, natural gas was the top source of electricity in the US, accounting for about 43% of the country's utility-scale electricity generation. Other major sources include nuclear energy (18%), coal (16%), and renewable sources (21%).
Wind energy, hydropower, solar power, biomass, and geothermal energy are some examples of renewable energy sources used to generate electricity in the US.
Electricity in the US is transmitted through a transmission grid of nearly 160,000 miles of high-voltage transmission lines. Power plants provide electricity to the grid at low voltage, and the voltage is then increased or "stepped up" by a transformer to minimize power losses during long-distance travel.
The transmission grids in the US are operated by transmission system operators (TSOs), which are typically not-for-profit companies owned by utilities in their respective service areas. TSOs coordinate, control, and monitor the operation of the electrical power system and are obliged to provide non-discriminatory transmission access to electricity generators and customers.
