
Nuclear power is a significant source of electricity in the United States, with 94 nuclear reactors operated by U.S. utilities in 2024, providing about 19-20% of the country's electricity. The U.S. has 54 nuclear power plants, with the largest being the Plant Vogtle in Georgia, which will have four reactors and a capacity of around 4.5 GW when Unit 4 comes online. The Palo Verde nuclear power plant in Arizona is the largest by net generation, contributing to the broader southwestern electric power grid. Nuclear power plants are spread across different states, with Texas and New York having advanced nuclear power plants that generate a significant portion of their electricity. Safety concerns have been raised about the U.S. nuclear fleet, with issues like radioactive leaks and the management of nuclear waste requiring careful attention.
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What You'll Learn

There are 54 nuclear power plants in the US
Nuclear power has long been a topic of discussion and debate in the United States, with Americans weighing the pros and cons, including the potential for meltdowns and the environmental costs. Despite the concerns, nuclear power has played a significant role in the country's energy landscape, providing 19%–20% of total annual US electricity generation from 1990 through 2021.
The US nuclear power plants are spread across various states, with some states relying more heavily on nuclear energy than others. For example, Texas has two advanced nuclear power plants with four reactors, contributing 8.3% of the state's electricity. In New York, nuclear energy plays an even more significant role, with commercial nuclear reactors producing nearly 25% of the state's electricity.
The Palo Verde nuclear power plant in Arizona is the largest nuclear power plant in the US by net generation. It has three reactors and a generation capacity of 3,937 megawatts (MW). The Vogtle nuclear plant in Georgia is nearing completion of a new reactor and is projected to become the largest nuclear power plant in the US when it enters service, with four reactors and a total generating capacity of 4,536 MW.
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94 nuclear reactors operated in 2024
As of 2024, there were 94 nuclear reactors operated by U.S. utilities, with a total net generating capacity of nearly 97 gigawatts (GW). This makes the US nuclear reactor fleet the largest commercial nuclear power generation fleet in the world. The fleet consists of 54 power plants, each with one to four operating units. The newest reactor to enter service is the Vogtle Unit 4 at the Alvin W. Vogtle Electric Generating Plant in Georgia, which began commercial operations in April 2024 with a nameplate electricity-generating capacity of 1,114 MW.
The Vogtle plant is now the largest nuclear power plant in the US, with four reactors and a total generating capacity of around 4.5 GW. Before the completion of Vogtle Unit 4, the Palo Verde nuclear power plant in Arizona was the second-largest nuclear power plant in the US in terms of generation capacity, with three reactors and a capacity of 3,937 MW.
Nuclear power has played an important role in the US energy sector, providing 19% to 20% of the country's annual electricity generation from 1990 through 2021. In 2024, nuclear power accounted for 19% of the US power sector's electricity generation and almost half of the domestic carbon-free electricity.
In recent years, there has been a shift towards extending the lifespan of nuclear reactors, with utilities planning to uprate capacity and restart formerly closed reactors. This is a notable change from 2022, when utilities were shutting down nuclear reactors. The extension of reactor operations is evident in the case of the Diablo Canyon Power Plant in California, which received credits from the US Department of Energy in January 2024 to support its continued operation. Additionally, the Department of Energy approved a loan to support the restarting of the Palisades nuclear power plant in Michigan, which would be the first previously retired nuclear power plant in the US to return to operating status.
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The Palo Verde nuclear plant in Arizona is the largest
The Palo Verde Nuclear Generating Station, located near Tonopah, Arizona, about 45 miles (72 km) west of downtown Phoenix, is the largest nuclear power plant in the United States. It covers 4,000 acres (1,600 ha) of land and consists of three pressurized water reactors, each with a capacity to produce 1.4 GW of electric power after a power uprate. The plant's average electric power production is about 3.3 gigawatts (GW), serving about four million people in the Southwest region.
Palo Verde is unique as the only "desert" nuclear plant in the western hemisphere, and it is a critical asset to the Southwest, generating approximately 32 million megawatt-hours annually. It is a major source of electric power for densely populated areas in Southern Arizona, Southern California, and Central New Mexico, including Phoenix, Tucson, Albuquerque, Las Vegas, Los Angeles, and San Diego. The plant is owned and operated by several companies, with Arizona Public Service (APS) holding the largest share at 29.1%.
The plant has faced security concerns, with drone incursions in September 2019 and a pipe with gunpowder residue found in a contract worker's truck in November 2007. National Guard troops were also dispatched to protect the site during the Iraq War in 2003 due to its strategic importance. Palo Verde is considered a top homeland security priority, with armed security guards, X-ray machines, explosive "sniffers", and heavily guarded turnstiles in place to protect the reactors.
While Palo Verde is currently the largest nuclear power plant in terms of generation capacity, the Vogtle nuclear plant in Georgia is nearing completion of a new reactor that will make it the largest in the country with a total of four reactors and a net summer electricity generation capacity of 4,536 MW.
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The US nuclear reactor fleet has high capacity-utilisation rates
The US nuclear reactor fleet has maintained high capacity-utilisation rates, despite the number of reactors declining since 2012. Power plant uprates—modifications to increase capacity—at individual nuclear power plants have helped the fleet sustain high capacity factors. Nuclear power provided 19%–20% of total annual US electricity generation from 1990 through 2021.
In 2024, US utilities operated 94 nuclear reactors with a total net generating capacity of nearly 97 gigawatts (GW). This makes the US the largest commercial nuclear power generation fleet in the world. America's nuclear reactor fleet consists of 54 power plants, each with one to four operating units. The largest nuclear power plant is the Plant Vogtle in Georgia, with four reactors and a total generating capacity of around 4.5 GW. The R.E. Ginna plant in New York is the smallest nuclear power plant, with one 0.6-GW reactor.
Nuclear power plants generally use more of their electricity generation capacity annually than hydropower facilities. The Grand Coulee Dam in Washington has the highest electricity generation capacity of any electric power plant in the US, at 7,079 megawatts (MW) net summer capacity. The Palo Verde nuclear power plant in Arizona is the second-largest, with three reactors and a generation capacity of 3,937 MW.
The high capacity factors of US nuclear power plants are due to shorter refueling and maintenance outages and improved operational experience. The average annual capacity factor for nuclear power plants in 2022 was 92.7%, higher than other power plants. The newest reactor to enter service since 2016 is the Unit 3 at the Alvin W. Vogtle Electric Generating Plant in Georgia, with a capacity of 1,117 MW.
The US nuclear industry faces challenges, including safety concerns and the high costs and environmental impacts of decommissioning nuclear reactors and uranium enrichment facilities. Nevertheless, the US Department of Energy has provided credits and loans to support the continued operation of nuclear power plants, recognising the importance of nuclear power in the country's energy mix.
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The US has the world's largest commercial nuclear power generation fleet
The United States is home to the world's largest fleet of commercial nuclear power plants. In 2024, US utilities operated 94 nuclear reactors with a total net generating capacity of 97 gigawatts (GW). This accounts for 19% of the US power sector's electricity generation. The US nuclear reactor fleet consists of 54 power plants, with each plant having between one and four operating units.
The Vogtle nuclear power plant in Georgia is the largest nuclear power plant in the US, with four reactors and a total generating capacity of around 4.5 GW. The R.E. Ginna plant in New York is the smallest nuclear power plant, with a single 0.6 GW reactor. The two reactors at Vogtle and one reactor at Watts Bar in Tennessee are the only new nuclear reactors to have come online in the US since 1996.
The US has a long history of nuclear energy development, dating back to the 1940s. The first controlled nuclear chain reaction was initiated in 1942 at the University of Chicago, as part of the wartime atomic bomb program. This led to the construction of the country's first commercial nuclear power plant in Shippingport, Pennsylvania, in 1958. Today, most US commercial nuclear power reactors are located east of the Mississippi River. Illinois has more reactors than any other state, with 11 reactors across six plants.
The US government has implemented policies to support the continued operation of nuclear power plants. For instance, in January 2024, the US Department of Energy provided credits to the Diablo Canyon Power Plant in California, which produced 2.2 GW of electricity, accounting for 9% of California's total electricity generation. The US Department of Energy has also approved a loan to support the restarting of the Palisades nuclear power plant in Michigan, which could become the first previously retired nuclear power plant in the US to return to operating status.
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Frequently asked questions
As of 2024, there are 54 nuclear power plants in the US, with a total of 94 nuclear reactors.
Nuclear power accounts for 19% of the US power sector's electricity generation. This has been consistent from 1990 through 2021.
The largest nuclear power plant in the US is Plant Vogtle in Georgia, with four reactors and a total generating capacity of around 4.5 GW.

















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