Tech
Three Mile Island Nuclear Generating Station
Three Mile Island, Pennsylvania (via Getty Images)

America’s 54 nuclear power plants, mapped

Constellation Energy plans to reopen the Three Mile Island nuclear plant in Pennsylvania

David Crowther

On Friday, Constellation Energy said that it has plans to reopen the Three Mile Island nuclear plant in Pennsylvania, the site of a nuclear meltdown that destroyed the second reactor at the power station in 1979.

The plant, which continued to operate safely for years after the accident, was eventually closed down in 2019 for economic reasons. But the conditions that led to its shutdown no longer hold, as demand for clean electricity soars thanks to growing demand for data centers. That has made boring old utilities stocks the best performers in the S&P 500 Index this year (chart), with Constellation Energy shares contributing significantly to that trend, having gained more than 120% in 2024.

But where are America’s nuclear power plants? We’ve mapped out the location of all 54, according to data from the Energy Information Administration.

Once operational, Three Mile Island would be the fifth nuclear power plant in Pennsylvania. Only Illinois, which has 6 nuclear plants, would have more. The rest are predominantly in eastern states, although the country’s largest is Palo Verde Station in Arizona, which has a total capacity of 3,937 megawatts — enough to power some 4 million homes.

For decades, America’s nuclear output plateaued, with new reactors in Georgia the first to be built from scratch in the US for more than 30 years. If demand for electricity to power the AI wave continues to boom, they won’t be the last.

America nuclear electricity

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Judge blocks Pentagon’s move to blacklist Anthropic

A federal judge in Northern California has granted a preliminary injunction blocking the Pentagon from labeling Anthropic as a national security supply chain risk.

The ruling temporarily prevents the Defense Department from restricting the AI company’s access to federal contracts amid a dispute over its refusal to allow certain military and surveillance uses of its technology. The designation could also have shifted lucrative government work toward competitors, including OpenAI.

Earlier this month, Anthropic, the company behind Claude, sued 17 federal agencies and their heads, alleging the government exceeded its statutory authority.

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