Key Takeaways Constellation Energy will restart the Three Mile Island Unit 1 nuclear plant to provide electricity to power Microsoft's data centers.The 20-year deal is part of Microsoft's effort to reduce its carbon footprint,

The shuttered Three Mile Island nuclear power plant is set to reopen and sell power exclusively to Microsoft, the tech giant announced Friday.

Constellation Energy plans to restart the Unit 1 reactor at Three Mile Island. It will sell the power to Microsoft to support the power needs of data centers. Unit 1 is separate from the reactor that partially melted down in 1979 in the worst nuclear accident in U.