The owner of the shuttered Three Mile Island nuclear plant in Pennsylvania will invest $1.6 billion to revive it, agreeing to sell all the output to Microsoft Corp. as the tech titan seeks carbon-free electricity for data centers to power the artificial intelligence boom.
Constellation Energy Corp., the biggest US operator of reactors, expects Three Mile Island to go back into service in 2028, according to a statement Friday. While one of the site’s two units permanently closed almost a half-century ago after the worst US nuclear accident, Constellation is planning to reopen the other reactor, which shut in 2019 because it couldn’t compete economically.
Shares of Constellation Energy jumped 6.5% in premarket trading on Friday.
Microsoft has agreed to purchase the energy for two decades and declined to disclose financial terms. This is the first time Microsoft has secured a dedicated, 100% nuclear facility for its use.
The decision is the latest sign of surging interest in the nuclear industry as power demand for AI soars. More than a dozen reactors went dark over roughly the past decade in the face of increasing competition from cheaper natural gas and renewable energy. But growing demand for electricity — from factories, cars and especially from data centers — has spurred interest in nuclear plants that can provide carbon-free power around the clock.
“Policymakers and the market have received a huge wake-up call,” Constellation Chief Executive Officer Joe Dominguez said in an interview. “There’s no version of the future of this country that doesn’t rely on these nuclear assets.”
Constellation — which has seen its shares jump this year thanks to mounting investor awareness of the value of power plants — plans to fund the project from its own coffers rather than seek state or federal support. That’s in contrast to Holtec International, which is pursuing the only other disclosed effort to restart a closed reactor, with about $1.8 billion in conditional funding from the US Energy Department and the state of Michigan. NextEra Energy Inc. has also said it’s considering reviving a closed Iowa reactor, in part to supply data-center customers.
While Constellation isn’t averse to outside financial support, Dominguez said government approvals move slowly and he doesn’t want to wait. Work at Three Mile Island is expected to start immediately. The deal to supply Microsoft with electricity from the 837-megawatt reactor is Constellation’s biggest-ever power purchase deal.
The restart effort has been in the works since early 2023, when Constellation began evaluating whether it made sense to switch the reactor back on. By early this year, the company had concluded that it wanted to pursue the project, and began talking to potential customers. Microsoft was immediately interested, Dominguez said.
The nuclear power purchase will aid Microsoft’s plans to run all of its massive global network of data centers on clean energy by 2025, Bobby Hollis, Microsoft’s vice president for energy, said in an interview. This nuclear energy will be used to fuel data-center expansion in areas like Chicago, Virginia, Pennsylvania and Ohio.
The software giant is overhauling its entire product line around AI and the resulting increase in demand for cloud-computing is imperiling Microsoft’s plans to be carbon negative by 2030, the company said earlier this year. It spent more than $50 billion on capital expenditures in the fiscal year that ended June 30, largely on data-center expansion. It plans to top that figure in the current fiscal year.
While the additional nuclear power will help Microsoft’s climate goals, it does not address the most intractable issue – emissions from concrete, steel and chips used in the data centers, Hollis said.
“This is not a simple piece, but it’s easier than figuring out how to decarbonize the entire supply chain,” he said.
Still, data centers make a useful customer for nuclear power. Wind and solar power outputs can vary, while a nuclear plant generally runs constantly and requires a customer that can take all of that electricity, Hollis said. That makes tech companies selling cloud computing an ideal option.
“We run around the clock. They run around the clock,” he said.
Microsoft isn't the only tech company looking to nuclear power to fuel its AI ambitions. Earlier this year, Amazon.com Inc.'s cloud computing division agreed to spend $650 million to acquire a data center campus connected to Talen Energy Corp.’s 40-year-old nuclear power plant on the Susquehanna River in Pennsylvania.
While the Three Mile Island reactor was mothballed in 2019, Dominguez said the equipment is still in good shape. Still, restarting it will require significant investments in the main transformer, turbine and cooling systems. The company will have to restaff the facility and must seek approval from the Nuclear Regulatory Commission. Constellation will also seek to extend its operating license through 2054, and is planning to rename the facility the Crane Clean Energy Center, after the late Chris Crane, former CEO of Exelon Corp., which spun out its generation unit to become Constellation in 2022.
One of the biggest hurdles will be connecting the plant to the power grid operated by PJM Interconnection LLC, which has a lengthy queue. If PJM can move fast enough, Dominguez said the facility could potentially be ready to supply power as early as 2027.
“I’m so glad we’re reversing a terrible mistake that shouldn’t have happened,” he said. “It will be a lot more difficult to achieve the energy transition if we only want to use wind and solar and storage.”
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