A unit of Pennsylvania's Three Mile Island nuclear plant will be restarted as part of a new energy-sharing agreement with Microsoft, which plans to use it to power the data centers it operates as part of its push into artificial intelligence.

Constellation said Friday the company has a 20-year deal with Microsoft to restore the Three Mile Island's Unit 1 nuclear power reactor, the site of an infamous nuclear power meltdown.

The site of the nation's most serious nuclear reactor accident could reopen by 2028 with Microsoft as its sole customer.